Browse Topic: Marine engines

Items (287)

Marine Control Cable Connection - Engine Throttle Lever

J961_202409 (Current)

09/09/2024

The purpose of this SAE Recommended Practice is to provide guides toward standard conditions for operating marine engine throttles (gasoline or diesel) where push-pull cable control is applicable. For control cable information see SAE J917

Marine Technical Steering Committee

Numerical Investigation of Premixed and Non-premixed Ammonia Main Charge Configurations Ignited by a Hydrogen-Fired Prechamber

03-17-08-0060

08/14/2024

Ammonia-fired reciprocating engines have emerged as a promising technology in the maritime and power generation sector at medium-to-large scale (1–80 MW). The use of “on-the-fly” partial ammonia decomposition to produce a relatively small amount of hydrogen that can be used as combustion promoter, replacing fossil fuels in this function, enables this technology to provide carbon-free propulsion and power generation. In this context, it is envisioned that a hydrogen-fired prechamber ignition strategy offers significant advantages by accelerating the ammonia ignition and complete combustion process, increasing its reliability and robustness while still aiming to achieve low NO x , N2O, and NH3 emissions. This study exploits an OpenFOAM-based Large Eddy Simulation (LES) numerical modeling framework to investigate the ignition and combustion behavior of an ammonia main charge ignited by a hydrogen-fired prechamber. First, a conventional port-injection premixed configuration for the ammonia

Indlekofer, Thomas, Haugen, Nils Erland, Førde, Olav Øyvind, Gruber, Andrea

Experimental Study of Lignin Fuels for CI Engines

2024-37-0022

06/12/2024

This study explores the feasibility of using a sustainable lignin-based fuel, consisting of 44 % lignin, 50 % ethanol, and 6 % water, in conventional compression ignition (CI) marine engines. Through experimental evaluations on a modified small-bore CI engine, we identified the primary challenges associated with lignin-based fuel, including engine startup and shutdown issues due to solvent evaporation and lignin solidification inside the fuel system, and deposit formation on cylinder walls leading to piston ring seizure. To address these issues, we developed a fuel switching system transitioning from lignin-based fuel to cleaning fuel with 85 vol% of acetone, 10 vol% of water and 5 vol% of ignition improving additive, effectively preventing system clogs. Additionally, optimizing injection parameters, adopting a constant pressure delivery valve, and fine-tuning injection timing mitigated lignin deposit formation related to incomplete combustion or spray tip penetration to the cylinder

Terauchi, Motoki, Simonsen, Tor, Mortensen, Simon, Schramm, Jesper, Ivarsson, Anders

Small Craft - Graphic Symbols

J1449_202405 (Current)

05/24/2024

This SAE Recommended Practice specifies graphic symbols for operator controls, gauges, tell-tales, indicators, instructions, and warning against risks in small craft and for engines and other equipment intended to be used in small craft

Marine Technical Steering Committee

Comparison of Tabulated and Complex Chemistry Approaches for Ammonia–Diesel Dual-Fuel Combustion Simulation

03-17-07-0055

04/18/2024

Using ammonia as a carbon-free fuel is a promising way to reduce greenhouse gas emissions in the maritime sector. Due to the challenging fuel properties, like high autoignition temperature, high latent heat of vaporization, and low laminar flame speeds, a dual-fuel combustion process is the most promising way to use ammonia as a fuel in medium-speed engines. Currently, many experimental investigations regarding premixed and diffusive combustion are carried out. A numerical approach has been employed to simulate the complex dual-fuel combustion process to better understand the influences on the diffusive combustion of ammonia ignited by a diesel pilot. The simulation results are validated based on optical investigations conducted in a rapid compression–expansion machine (RCEM). The present work compares a tabulated chemistry simulation approach to complex chemistry-based simulations. The investigations evaluate the accuracy of both modeling approaches and point out the limitations and

Krnac, Dominik, Manickam, Bhuvaneswaran, Holand, Peter, Pathak, Utkarsh, Scharl, Valentin, Sattelmayer, Thomas

On the Application of Joule-Cycle-Based Waste Heat Recovery to Heavy-Duty Vehicles

2024-01-2589

04/09/2024

Internal combustion engines are becoming ever more efficient as mankind seeks to mitigate the effects of climate change while still maintaining the benefits that a mechanized society has brought to the global economy. As peak values, mass production spark-ignition engines can now achieve approximately 40% brake thermal efficiency and heavy-duty truck compression-ignition engines can approach 50%. While commendable, the unfortunate truth is that the remainder gets emitted as waste heat and is sent to the atmosphere to no useful purpose. Clearly, if one could recover some of this waste heat for beneficial use then this is likely to become important as new means of mitigating fossil CO2 emissions are demanded. A previous study by the authors has identified that the closed Joule cycle (or complications of it beginning to approximate the closed Ericsson cycle) could reasonably be developed to provide a practical means of recovering exhaust heat when applied to a large ship engine. In that

Turner, James, Kenkoh, Kesty Yong, Gubba, Sreenivasa, Vorraro, Giovanni

A Study on the Relationship between ECN Spray D and Marine-Sized Nozzles Using FGM Combustion Model

2024-01-2695

04/09/2024

Present work investigates the relationship between the combustion parameters of a well-known ECN heavy-duty nozzle called Spray D and marine-size nozzles. The study is carried out in OpenFOAM software within the framework of RANS turbulence modelling, using a flamelet based tabulation technique known as FGM to model the combustion. The large nozzles are tested in a constant volume chamber representative of marine engines, for which a CFD setup is validated against inert data in literature. The reacting results have been validated first with experimental data, initializing the domain with a highly reactive environment (23% oxygen) and engine-like swirl. Then, a less reactive initial condition was set up in the domain (15% oxygen) without swirl, to achieve a Spray D-like environment. The main goal is to study the variation of the combustion parameters Ignition Delay Time (IDT) and Lift-Off Length (LOL) as function of nozzle diameter, leading to a mathematical correlation to estimate the

Di Matteo, Andrea, Somers, Bart

Numerical Study of the Effect of Direct-Injection Timing of Methanol and Excess Air Ratio on the Combustion Characteristics of a Marine Diesel-Methanol Dual-Fuel Engine

2023-01-1626

10/31/2023

Methanol is a suitable alternative fuel to relieve the problem of energy shortage and decrease the emission of greenhouse gases. The effect of direct-injection timing of methanol and diesel on the combustion characteristics of a marine diesel engine with bore of 210 mm was simulated with a 3-dimentional computational fluid dynamic (CFD) software AVL-FIRE. The combustion model was set-up and validated by the experimental data from the marine diesel engine. Results show that there are two peaks on the heat release rate (HRR) curves with the normal diesel-methanol combustion process. The first HRR peak is caused by the combustion of diesel. The second HRR peak is resulted from the hybrid combustion process of diesel and methanol. The injection timing of diesel influences the peak pressure rise rate (PPRR) and ignition timing. The indicated mean effective pressure (IMEP), the maximum in-cylinder pressure and combustion duration are influenced by the direct-injection timing of methanol

Li, Xiao, Yan, Ping, Li, Hong-Mei, Zheng, Liang, Shen, Gang, Hu, Yu-Chen, Han, Dan

Effects of the Combustion Enhancer Containing Alkyl Nitrate (CEN) to Dodecane and HVO as Pilot Fuels on a Compression Ignition Engine Operating in Dual-Fuel with Ammonia

2023-01-1625

10/31/2023

Ammonia is a widely used and known chemical. Today it is seen as a carbon free solution to fuel thermal engines especially in applications where other solutions would not be realistic. For marine applications, electrical or fuel cells solutions for example would not allow spans long enough to sustain big cargo ships ranges. Engine manufacturer such as MAN, Wartsila or Win-GD have already announced the development of marine engine running on ammonia. But while ammonia is a non-CO2 emitting fuel, it has some caveats such as being gaseous in standard conditions and hard to ignite. As it is now, ammonia is usually used in compression ignition engines with the help of highly reactive carbonated pilot fuels. Many forms of dual-fuel combustion are conceivable, although all the simple ones use a carbon-based fuel and quite often originated from fossil oil. The addition of High Reactivity Fuel to Ammonia is an interesting combustion mode that can be used to calibrate different fuel parameters

Samson, Richard, Morin, Anne-Gaëlle, Foucher, Fabrice

A Study on Combustion and Emission Characteristics of Ammonia, Hydrogen and Diesel Tri-Fuel Engines

2023-32-0103

09/29/2023

Ammonia is a promising alternative to conventional fossil fuels for internal combustion engines, especially in the maritime industry, because it does not emit carbon dioxide. Since redundancy is important in marine engines, a dual fuel system with diesel oil is currently widely applied to use alternative fuels such as liquefied natural gas, and a similar system is expected for ammonia-fueled ships. However, ammonia has low ignitability and low burning speed, hence improvement of combustion efficiency is major challenge. In addition, the emission of N2O which has a high global warming effect is also problematic as well as emission of NOX as air pollutant. To overcome these challenges, a mixing with hydrogen, which has high ignitability and high burning speed, can be effective. Therefore, in this study, combustion and emission characteristics of tri-fuel combustion engines, in which ammonia and hydrogen-air mixture is ignited by μ-pilot injection of diesel oil, were investigated

Matsunaga, Daichi, Tentora, Takafumi, Hiraoka, Kenji, Toshinaga, Kazuteru

Comparison of the effect of diesel and hydrogen addition on ammonia combustion characteristics in a marine engine

2023-32-0065

09/29/2023

Ammonia, as a carbon-free fuel, is a promising alternative fuel source for decarbonization of the shipping industry. Nevertheless, the poor flammability and low flame speed restrict its potential application as marine engine fuel. In order to explore the ammonia application feasibility and methods in marine engines, the effects of two combustion promoters, including n-heptane and hydrogen, on improving the ammonia combustion characteristics were compared and discussed theoretically in this study, in terms of flammable intake boundary conditions and laminar flame speed under engine operating conditions. A new detailed reaction mechanism of ammonia/n-heptane dual fuel was developed and validated to characterize the combustion of ammonia and diesel. The results demonstrate that the flammability of ammonia is more sensitive to intake temperature as compared to equivalence ratio and intake pressure. The introduction of n-heptane or hydrogen has been observed to have a noteworthy impact on

Liu, Long, Wu, Yue, Wang, Yang, Wu, Jie, Wang, Xiqing

Research on Wall Temperature of Flame-wall Interaction Based on Laser-Induced Phosphorescence and Heat Transfer Simulation

2023-32-0056

09/29/2023

Heavy heat load is one of the bottlenecks restricting the highly intensive marine engine development. Reducing wall heat loss contributes to this target. The wall heat transfer is mainly influenced by flame-wall interaction (FWI). In this paper, a wall temperature distribution measurement system is developed based on the Laser-Induced Phosphorescence (LIP). The effects of the coating thickness and the laser fluence on LIP are studied to clarify the accuracy of wall temperature measurement based on LIP and the one-dimensional wall temperature distribution. In addition, a conjugate heat transfer model of FWI was established based on CONVERGE to simulate the FWI and the accompanying heat transfer process. The simulation is compared with the experimental wall temperature results and demonstrates the effectiveness of the conjugate heat transfer model. The influence of the initial velocity, the impinging distance and the wall roughness on the wall heat transfer are studied. The effective way

Xuefeng, XUE, Run, CHEN, Tie, LI, Xinyi, ZHOU, Jiale, CAO, Xin, TANG

Prediction of combustion process and NOx emission for dual fuel marine engines using a phenomenological model

2023-32-0158

09/29/2023

A phenomenological model for high-pressure direct injection natural gas-diesel dual-fuel marine engine was developed, which includes natural gas mixing process using Musculus discrete control volume transient diesel jet model, combustion process using quasi-steady model and Woschini heat transfer model, NO generation using Zeldovich mechanism. Effects of natural gas injection pressure and the start of injection timing on the mixing and combustion process were investigated. The results indicated that increasing the injection pressure with fixed injection mass, the NO emission decreased. While the start of injection timing was before TDC, retarding the injection start timing will increase NO generation

Xiong, Qian, Liang, Dezhi, Wang, Lujiang, Shi, Xinru, Liu, Long, Ma, Xiuzhen

A Numerical Methodology to Test the Lubricant Oil Evaporation and Its Thermal Management-Related Properties Derating in Hydrogen-Fueled Engines

03-17-02-0015

09/15/2023

Due to the incoming phase out of fossil fuels from the market in order to reduce the carbon footprint of the automotive sector, hydrogen-fueled engines are candidate mid-term solution. Thanks to its properties, hydrogen promotes flames that poorly suffer from the quenching effects toward the engine walls. Thus, emphasis must be posed on the heat-up of the oil layer that wets the cylinder liner in hydrogen-fueled engines. It is known that motor oils are complex mixtures of a number of mainly heavy hydrocarbons (HCs); however, their composition is not known a priori. Simulation tools that can support the early development steps of those engines must be provided with oil composition and properties at operation-like conditions. The authors propose a statistical inference-based optimization approach for identifying oil surrogate multicomponent mixtures. The algorithm is implemented in Python and relies on the Bayesian optimization technique. As a benchmark, the surrogate for the SAE5W30

De Renzis, Edoardo, Mariani, Valerio, Bianchi, Gian Marco, Cazzoli, Giulio, Falfari, Stefania

Effect of Intake Conditions (Temperature, Pressure and EGR) on the Operation of a Dual-Fuel Marine Engine with Methanol

2023-24-0046

08/28/2023

In the upcoming decade sustainable powertrain technologies will seek for market entrance in the transport sector. One promising solution is the utilization of dual-fuel engines using renewable methanol ignited by a pilot diesel fuel. This approach allows the displacement of a significant portion of fossil diesel, thereby reducing greenhouse gas emissions. Additionally, this technology is, next to newbuilds, suited for retrofitting existing engines, while maintaining high efficiencies and lowering engine-out emissions. Various researchers have experimentally tested the effects of replacing diesel by methanol and have reported different boundaries for substituting diesel by methanol, including misfire, partial burn, knock and pre-ignition. However, little research has been conducted to explore ways to extend these substitution limits. Therefore, this study aims to investigate the effects of intake conditions, such as intake air temperature and pressure, and exhaust gas recirculation (EGR

Dierickx, Jeroen, Dejaegere, Quinten, Van Gijzeghem, Andreas, Devos, Stan, De Cock, Berten, Verhelst, Sebastian

Numerical Investigation of the Ignition Delay and Laminar Flame Speed for Pilot-Ignited Dual Fuel Engine Operation with Hydrogen or Methanol

2023-24-0011

08/28/2023

The use of renewable fuels such as hydrogen and methanol in marine engines is a promising way to reduce greenhouse gas emissions from maritime transport. Hydrogen and methanol can be used as the main fuel in dual-fuel engines. However, the co-combustion of hydrogen-diesel and methanol-diesel needs to be carefully studied. In the present work, the ignition delay (ID) and laminar burning velocity (LBV) for pilot-ignited dual fuel engine operation with hydrogen or methanol are studied. A constant volume batch reactor numerical setup is used in the open source Cantera code to calculate the effect of the premixed fuel on the ID of the pilot fuel. Also, Cantera is used to simulate a freely-propagating, adiabatic, 1-D flame to estimate the laminar flame speed of either hydrogen or methanol and how it is affected by the presence of pilot fuel. First, suitable chemical kinetic schemes are selected based on experimental data collected from the literature. Then ID and LBV are estimated for

Parsa, Somayeh, Verhelst, Sebastian

Investigation of Liquid Lignin-Methanol Blends under Realistic Two-Stroke Marine Engines Conditions

2023-24-0085

08/28/2023

With a view to reducing the environmental impact of fossil fuels, advanced lignin-based biofuels could provide a valuable contribute, since lignin is the most abundant biopolymer on earth after cellulose. However, its thermophysical properties would hamper its use as a pure fuel. In this work we investigated the combustion behavior of sprays of a liquid lignin-methanol blend and evaluated its potential as a low-carbon marine fuel for large two-stroke engines. To this end, an experimental campaign was conducted in an optically accessible combustion chamber whose main dimensions correspond to those of a single cylinder for large two-stroke engines. The chamber is provided with optical accesses for optical diagnostics of the combustion process. The combustion of the mixture was ignited using a diesel pilot jet as the ignition source. Two marine injectors are mounted in the chamber, namely “main” and “pilot” injectors. The tests were performed in environmental conditions around 40 bar and

Lazzaro, Maurizio, Sementa, Paolo, Catapano, Francesco, Tornatore, Cinzia, Iannuzzi, Stefano, Boot, Michael, Kouris, Panos

Modeling and Design of a PEM Fuel Cell System for Ferry Applications

2023-24-0145

08/28/2023

The upcoming regulations to achieve zero-emission passenger transport present challenges for designing new ferry powertrains. The proposed work investigates the feasibility of using a Proton Exchange Membrane Fuel Cell (PEMFC) power system to power a long-haul ferry. The paper describes the zero-order cell model as well as the method for estimating cell degradation. The stack modeling, heat balance equations, and auxiliary modeling are also presented. The proposed model enables the simulation of the fuel cell under different operating conditions and includes the use of air or oxygen as an oxidizer. A thermal management strategy for the overall PEMFC system is also proposed. The model was calibrated on the characteristic curves of the PEMFC Ballard FCvelocity™ HD6 (150 kW) and validated by reproducing experimental results. Then, a real load profile of a ferry, as well as the proposed powertrain is considered as case study. The presented results are related to a single daily mission and

Saponaro, Gianmarco, Stefanizzi, Michele, Franchini, Emanuele, Torresi, Marco, Camporeale, Sergio

MEMS Application to Monitor the In-Cylinder Pressure of a Marine Engine

2023-24-0023

08/28/2023

The transport of goods and people by sea, today, must meet the need to reduce the consumption of fuel oil. In addition, it has to ensure operational reliability and vessel availability, to reduce maintenance costs and comply with emission legislation. To this end, it is necessary to apply a marine engine combustion control system already widely used in engines for land transport. This will allow the ship's engines to operate reliably and in compliance with the best performance for which it was designed. The combustion control could also ensure a more balanced operation of the cylinders and reduce the torsional vibrations of the entire engine, as well as the management of the engine according to the adopted fuel: diesel, dual fuel, methanol, ammonia. Generally, the control of combustion in engines is carried out through the use of pressure sensors that face directly into the combustion chamber. These are expensive systems and are affected by the severe operating conditions of the marine

Mancaruso, Ezio, De Simio, Luigi, Iannaccone, Sabato, Marchitto, Luca, Vaglieco, Bianca Maria, Milano, Luca, Cameretti, Maria Cristina

Turboshaft/Turboprop Gas Turbine Engine Test Cell Correlation

ARP4755C (Current)

05/19/2023

This paper describes a recommended practice and procedure for the correlation of test cells that are used for the performance testing of turboprop and turboshaft engines. This Aerospace Recommended Practice (ARP) shall apply to both dynamometer and propeller based testing. Test cell correlation is performed to determine the effect of any given test cell enclosure and equipment on the performance of an engine relative to the baseline performance of that engine. Although no original equipment manufacturer (OEM) documents are actually referenced, the experience and knowledge of several OEMs contributed to the development of this document. Each engine manufacturer has their own practices relating to correlation and they will be used by those OEMS for the purpose of establishing certified test facilities

EG-1E Gas Turbine Test Facilities and Equipment

APU Gas Turbine Engine Test Cell Correlation

ARP5435A (Current)

05/19/2023

This paper describes a recommended practice and procedure for the correlation of test cells that are used for the performance testing of APU (auxiliary power unit) engines. Test cell correlation is performed to determine the effect of any given test cell enclosure and equipment on the performance of an engine relative to the baseline performance of that engine. The baseline performance is generally determined at the original equipment manufacturer (OEM) designated test facility. Although no original equipment manufacturer (OEM) documents are actually referenced, the experience and knowledge of several OEMs contributed to the development of this document. Each engine Manufacturer has their own practices relating to correlation and they will be used by those OEMs for the purpose of establishing certified test facilities

EG-1E Gas Turbine Test Facilities and Equipment

Turbofan and Turbojet Gas Turbine Engine Test Cell Correlation

ARP741D (Current)

05/01/2023

This SAE Aerospace Recommended Practice (ARP) describes a recommended practice and procedure for the correlation of test cells that are used for the performance testing of turbofan and turbojet engines. Test cell correlation is performed to determine the effect of any given test cell enclosure and equipment on the performance of an engine relative to the baseline performance of that engine. When baseline testing is performed in an indoor test cell, the baseline performance data are adjusted to open air conditions. Although no original equipment manufacturer (OEM) documents are actually referenced, the experience and knowledge of several OEM’s contributed to the development of this document. Each engine Manufacturer has their own practices relating to correlation and they will be used by those OEMs for the purpose of establishing certified test facilities

EG-1E Gas Turbine Test Facilities and Equipment

Research on Design Development and Modification of a Steel Piston in a Heavy-Duty Diesel Engine

2023-01-5023

04/24/2023

The thermal and mechanical loads of the engine rise dramatically with the increase in engine power density, which places higher demands on the design of the piston. In this paper, the design development of a steel piston for a marine diesel engine belonging to 190 series heavy-duty diesel engines was studied. The design methods including material selection and structural design were used to finished the preliminary design. In the meanwhile, the design philosophies of the aluminum alloy piston and composite piston for the 190 series diesel engines were used for reference in the design process. The designed steel piston was tested in the engine durability bench test and simulated for reliability. The results showed that the failure of the steel piston occurred at the same position in both the test and the simulation. The cause of cracking in the steel piston was analyzed, and the insufficient strength of the local structure led to high-cycle fatigue failure. Based on the failure

Liu, Yipeng, Jing, Guoxi, Zhang, Longfei, Han, Mengyu, Zhang, Weibin, Liu, Hai, Zhang, Zhongwei

The Effect of Engine Parameters on In-Cylinder Pressure Reconstruction from Vibration Signals Based on a DNN Model in CNG-Diesel Dual-Fuel Engine

2023-01-0861

04/11/2023

In marine or stationary engines, consistent engine performance must be guaranteed for long-haul operations. A dual-fuel combustion strategy was used to reduce the emissions of particulates and nitrogen oxides in marine engines. However, in this case, the combustion stability was highly affected by environmental factors. To ensure consistent engine performance, the in-cylinder pressure measured by piezoelectric pressure sensors is generally measured to analyze combustion characteristics. However, the vulnerability to thermal drift and breakage of sensors leads to additional maintenance costs. Therefore, an indirect measurement via a reconstruction model of the in-cylinder pressure from engine block vibrations was developed. The in-cylinder pressure variation is directly related to the block vibration; however, numerous noise sources exist (such as, valve impact, piston slap, and air flowage). A deep neural network (DNN) model is among the most feasible ways to reconstruct the in

Kim, Gyeonggon, Park, Chansoo, Kim, Wooyeong, Jeon, Jeeyeon, Jeon, Miyeon, Bae, Choongsik, Kim, Wooyeong

External Ignition Protection of Marine Electrical Devices

J1171_202302 (Current)

02/20/2023

This SAE Recommended Practice covers all electrical devices suitable for use in marine engine compartments and fuel tank spaces

Marine Technical Steering Committee

Digital Profiles of Work Processes of a Marine Engine for Calculated Indicator Diagrams in Operating Modes Other than Maximum Continuous Rating

2023-01-5008

02/08/2023

Obtaining and analyzing indicator diagrams are mandatory procedures stipulated by the technical operating rules for most types of marine engines. For this purpose a whole arsenal of mechanical and electronic indicating devices of periodic or continuous action is created. Information on the results of engine indications in bench tests are usually provided by the manufacturer in the form of bitmaps. This complicates the process of using them as reference diagrams necessary for comparison with real diagrams obtained during operation using electronic diagnostic systems. Changes in approaches to logistics operations in maritime transport have imposed a number of limitations, narrowing the use of indicator methods. The tendency to reduce the commercial speed of ships makes it impossible to take indicator diagrams on the specified modes of operation. As a result, the effectiveness of using indicator diagrams for assessing the current technical condition is drastically reduced. In this regard

Belousov, Evgen, Marchenko, Andrii, Rybalchenko, Mykola, Tuluchenko, Galina, Gritsuk, Igor, Savchuk, Volodymyr, Volodarets, Mykyta

Development of an Optical Investigation Method for Diesel and Oxymethylene Ether Spray in a Large-Bore Dual-Fuel Engine Using a Fisheye Optical System

03-16-05-0036

12/07/2022

Optical combustion phenomena investigation is a common tool for passenger car and automotive engines. Large-bore engines for stationary and mobile applications, on the other hand, have a lower optical examination density. This is mainly due to the technically more complex design of the optical accesses that have to provide a larger field of view and withstand high mechanical and thermal loads. Nevertheless, an optical investigation of in-cylinder phenomena in large-bore engines is essential to optimize efficient and environmentally friendly combustion processes using new sustainable e-fuels. To realize a simple optical access with maximum observability of the combustion chamber, a fisheye optic for the direct integration into internal combustion engines was developed and used for in-cylinder Mie-scattering investigations of diesel and Oxymethylene Ether (OME3-5) pilot fuel spray of natural gas dual-fuel combustion processes in a MAN 35/44DF single-cylinder research engine. As this

Karmann, Stephan Bernhard, Weber, Stefan, Stürzl, Wolfgang, Prager, Maximilian, Jaensch, Malte, Wachtmeister, Georg

Experimental Study on the Performance and Emission Characteristics of a Diesel Engine on an Actual Ship Using Diesel Fuel and Water-Diesel Emulsion

2022-01-5091

10/31/2022

This paper experimentally investigates the effects of water-diesel emulsion properties on marine diesel engine performance and exhaust emissions. The study was conducted in a six-cylinder, in-line, four-stroke, direct-injection 3D6 marine diesel engine that runs on water-diesel emulsion and pure diesel fuel according to the propeller characteristic. The results show that the chemical energy of the gas mixture in the cylinders of an engine using the water-diesel emulsion of 15% water content was 0.875 times that of diesel fuel. The emulsion consumption must be increased by 1.14 times to compensate for the loss of chemical energy, and the excess air coefficient is more significant by 1.225 times. A part of the heat released from the reactions is spent on water evaporation during emulsion combustion, which reduces the exhaust gas temperature and NOx by more than 35%. On average, the smoke number is higher by 2% in low-speed modes, while it is less than 3% in other operating modes. The

Hiep, Nguyen Ha, Quan, Nguyen Quoc

Towards Next Generation Control-Oriented Thermo-Kinetic Model for Reactivity Controlled Compression Ignition Marine Engines

2022-01-1033

08/30/2022

With low-temperature combustion engine research reaching an applicable level, physics-based control-oriented models regain attention. For reactivity controlled combustion concepts, chemical kinetics-based multizone models have been proven to reproduce the governing physics for performance-oriented simulations. They offer accuracy levels similar to high-fidelity computational fluid dynamics (CFD) models but with a fraction of their computational effort. Nevertheless, state-of-the-art reactivity controlled compression ignition (RCCI) simulations with multizone model toolchains still face challenges related to predictivity and calculation speed. This study introduces a new multizone modelling framework that addresses these challenges. It includes a C++ code, deeply integrated with open-source, thermo-kinetic libraries, and coupled to an industry standard 1-D modelling framework. Incorporating a predictive turbulence mixing model, it aims to eliminate dependence on CFD-based initialisation

Vasudev, Aneesh, Cafari, Alberto, Axelsson, Martin, Mikulski, Maciej, Hyvonen, Jari

Combustion Control Strategies for Dual-Fuel Marine Engines Operated with Fluctuating LNG Qualities

2022-01-1058

08/30/2022

The world of shipping is at a turning point. Alongside methanol, ammonia and other PtL (Power to Liquid) fuels, liquefied natural gas (LNG) offers one way of achieving climate-friendly ship operation. Although currently still derived from fossil sources, LNG combines the properties of already having a well-established land-based infrastructure, of enabling a 100 % climate-neutral supply via electrolysis and methanization, and of its ability for any high proportion of climate-neutral LNG to be used as a drop-in fuel during the transformation process in the next decades; proven by the first bunkering of the container vessel “ElbBlue” with 20 tons of SNG (Synthetic Natural Gas) in 2021 [1]. Up to now, LNG fueled marine engines have predominantly been operated in fixed operation areas. Therefore, they can bunker stable gas qualities at specific ports and can be optimized for a specific gas quality. This has mostly been done by means of adapted engine control maps and hardware adjustments

Schleef, Karsten, Henke, Björn, Cepelak, Sebastian, Glauner, Manuel, Dinwoodie, Jules, Theile, Martin, Buchholz, Bert

Towards Next Generation Control-Oriented Thermo-Kinetic Model for Reactivity Controlled Compression Ignition Marine Engines

1324108/15/2022

Vasudev, Aneesh

New biodiesel strains offer measurable gains

22TOFHP06_1106/01/2022

Extensive research and development of Hydrotreated Vegetable Oil (HVO) as a renewable and environmentally friendly fuel for diesel engines has been carried out by various OEMs and Tier 1s over the past decade. Its use has been evaluated for a wide variety of applications, including on-road commercial vehicles, agricultural machines and marine engines. HVOs usually are refined from vegetable oil feedstock by hydrocracking and then hydrogenating vegetable oil. This process reduces the size of the molecules in the triglycerides or fatty acids while also adding hydrogen to them. The advantage of hydrotreating vegetable oils for this purpose is that it produces a high-quality fuel without compromising engine performance, exhaust aftertreatment devices or exhaust emissions. HVOs offer potential environmental benefits even over traditional biodiesel, including tailpipe emissions in the form of nitrogen oxide (NOx), CO2 and other pollutants that are harmful to the earth's atmosphere

Wolfe, Matt

Hybrid Auxiliary Propulsion System

TBMG-45933

06/01/2022

Leonardo DRS Inc. Arlington, VA 571-447-4624

Operator Sound Pressure Level Exposure Measurement Procedure for Powered Recreational Craft

J1281_202204 (Current)

04/25/2022

This SAE Standard establishes the procedure for determining the operator duty cycle sound pressure level Lodc to which operators of powered recreational craft up to 24 m in length are exposed during typical operation as determined by marine engine duty cycle studies. This document describes the instrumentation, the required calibration procedures, the test site, the specifications for “standard craft”, the craft operating conditions, microphone positioning, test procedure, engine speeds for each of the Duty Cycle modes and the formula and table for calculating the Duty Cycle operator ear sound pressure level. This document is subject to change to keep pace with technical advances as well as other international standards and practices. Changes in this Revision: The sound pressure level measurements performed while applying this document are based on the Five-Mode Marine Engine Duty Cycle instead of a single engine speed. A calculation is required to obtain the Duty Cycle operator ear

Marine Technical Steering Committee

Applying the Hilbert Envelope Method to Refine the Ultrasonic Technique for Piston Ring Oil Film Thickness Measurements in a Marine Diesel Engine

03-16-02-0011

04/21/2022

The greatest frictional contributor in an internal combustion engine is the contact between the piston ring pack and cylinder liner. Therefore, an improved lubrication regime has the potential to raise engine efficiency while lowering emissions, aiding to meet environmental regulations. Previous ultrasonic measurements of the oil film thickness (OFT) between piston rings and the cylinder liner in a marine engine have been subject to several unexpected trends. This article refines the measurement to identify and remove these factors, the trends were found to have arisen due to the detection of ultrasonic reflections from the piston ring outside of the expected alignment zone. The extent of these undesired reflections is thought to be due to the liner thickness providing a relatively large distance for spreading of the ultrasonic wavefront. The hitherto used Frequency Index method (index of the fast Fourier transform (FFT) at the transducer central frequency) has been compared to the

Rooke, Jack, Li, Xiangwei, Dwyer-Joyce, Robert S.

CFD Modeling of Impinging Sprays Under Large Two-Stroke Marine Engine-Like Conditions

2022-01-0493

03/29/2022

To improve the combustion and emission characteristics of the large-bore marine engines, the spray is usually designed as an inter-spray impingement to promote the fuel-air mixing process, which implies frequent droplet collisions. Properly describing the collision dynamics of liquid droplets has been of interest in the field of spray modeling for marine engine applications. In this context, this work attempts to develop an accurate and efficient methodology for modeling impinging sprays under engine-like conditions. Experimental validations in terms of spray penetration and morphology are initially carried out at different operating conditions considering the parametric variations of ambient temperature and pressure, where the measurements are performed on a large-scale constant volume chamber with two symmetrical injectors. The existing models, including O’Rourke and Nordin’s collision models, are also applied and the obtained results are compared to further assess the accuracy and

Zhou, Qiyan, Lucchini, Tommaso, D'Errico, Gianluca, Paredi, Davide, Xia, Jin, Lu, Xingcai

TOC

99-04-01-0TOC03/18/2022

Tobolski, Sue

Application of Image Color Analysis for the Assessment of Injector Nozzle Deposits in Internal Combustion Engines

04-15-02-0010

01/18/2022

The article contains the results of operational investigations of deposit formation on external and internal surfaces of injector nozzles of the marine self-ignition engines during their operational use. The aim of this article is to introduce an image analysis method for global assessment of the quantity and quality of injector nozzle deposits in piston internal combustion engines. The components of medium-speed marine engines fueled with distillation and residual fuels were investigated. Digital images of new and used injector nozzles without deposits and with random deposits formed after natural operation on marine ships, respectively, were taken. Macro and microscopy images of external surfaces were taken in a shadowless tent and were illuminated with low-temperature lamps. The characteristic surfaces of the injector nozzles were virtually separated from the white background. The amount and quality of the resulting deposits on individual injector nozzles was determined by means of

Monieta, Jan

Identification of Reliability States of a Ship Engine of the Type Sulzer 6AL20/24

03-15-04-0028

11/16/2021

The article presents results of tests performed with the use of a ship engine of the type Sulzer 6AL20/24. The goal of the tests was to create and verify an identification procedure for the analyzed object’s reliability states to be used without interfering with the object operation processes. The proposed method is based on an analysis of vibrations and noise generated during the engine operation, which are considered to be the most significant diagnostic signals. The signals of the engine vibrations and noise recorded during the engine operation on a laboratory test stand have been analyzed in the time domain. A number of the recorded signal characteristics are calculated. The characteristics are statistically analyzed in order to choose those which can provide the basis for the identification of reliability states. Next, based on the spaces of ability and inability, states are formulated. The spaces are used for the identification of ability states and selected inability states

Pająk, Michał, Muślewski, Łukasz, Kluczyk, Marcin, Kolar, Davor, Landowski, Bogdan, Kałaczyński, Tomasz

Effect of Spray Included Angle and Swirl Ratio on Combustion and Emissions under Post Injection

2021-01-1169

09/21/2021

The widespread application and increasingly stringent emission regulations call for more attention to optimize combustion process and emissions of marine diesel engine. This study conducts a numerical study to investigate the individual effect and their interaction of three post injection duration (3°CA, 5°CA and 7°CA), four spray included angles (145°, 150°, 155° and 160°) and four swirl ratios (0.5, 0.85, 1.2 and 1.6) in a marine diesel engine with main-post injection. These three parameters all exert impact on in-cylinder combustion performance and emissions by affecting fuel-air mixing quality. Results show that decreasing post injection duration from 7°CA to 3°CA shortens the combustion duration and decreases soot emission by 13.2%, while that induces a slight increase in NOx emissions by 1.0%. Spray included angle changes the spray targeting position within the combustion chamber. Wider spray included angle raises the peak value of in-cylinder pressure by 1%, decreases indicated

Zhao, Changpu, Kong, Shiru, Bian, Zhishang

Marine Push-Pull Control Cables

J917_202108 (Current)

08/19/2021

This SAE Standard covers dimensions, performance parameters, and nomenclature of a push-pull control cable used in outboard, inboard, and sterndrive marine throttle and shift applications

Marine Technical Steering Committee

Comparison of Ring-Liner Oil Film Thickness Resulting from Different Injector Designs in a Diesel Marine Engine Using an Ultrasound Measurement Method

03-14-06-005305/28/2021

The global drive to combat climate change is a primary driving force towards producing greener and cleaner marine diesel engines to meet emission legislations. The main cause of an engine’s parasitic frictional loss is the interaction between piston rings and the cylinder liner. Therefore, the piston ring lubricating oil film has been the focus of much prior research, chiefly focusing on small-scale automotive engines. This work employs the ultrasonic reflectometry technique to evaluate the oil film formation resulting from different lubricant injector arrangements on a large two-stroke marine diesel engine. A series of piezoelectric transducers close to the top dead center (TDC) have quantified the oil film thickness (OFT) across three engine loading levels and three injector configurations. The injector configurations compare a more traditional pulse-jet (PJ) injector to a needle lift-type (NLT) injector, which reduces the rate of lubricant atomization. The results gathered show that

Rooke, Jack, Li, Xiangwei, Brunskill, Henry, Stark, Matthias, Dwyer-Joyce, Rob

A New Optical Access for Medium Speed Large Bore Marine Engines under Full-Load Operating Conditions

03-14-06-005205/26/2021

The following work presents a new concept for optical accessibility of a single-cylinder medium-speed large-bore marine engine from the concept development to the implementation and feasibility investigation in a test bench observing the flame chemiluminescence of dual-fuel (DF) combustion. The design’s feasibility is verified using conjugated heat transfer (CHT) and finite element method (FEM) simulation during the whole design process presented herein. Assumptions made for the simulation, e.g., of the mount between the optical component and the steel engine parts, are evaluated in pretesting setups presented and described as follows. The optical access is made to withstand steady-state full-load operating conditions and is proofed so. The optical access is designed for an engine with a bore of 350 mm and a stroke of 440 mm. With the presented approach, optical investigations like particle image velocimetry (PIV), laser-induced fluorescence, and flame chemiluminescence in the whole

Karmann, Stephan Bernhard, Kunkel, Christian, Prager, Maximilian, Wachtmeister, Georg

Signal Reconstruction of Two-Color Pyrometry Technique Using CFD and a Detailed Spectral Radiation Model in a Marine Diesel Engine Setup

2021-01-050004/06/2021

Optical soot pyrometry is a mature experimental technique that has been applied to a broad range of combustion systems for measuring soot temperature and concentration. Even though the method is widely used and well documented, the line of sight nature of the technique makes the interpretation of its results challenging. Notably, gradients in temperature and soot concentration along the line of sight or across the field of view can introduce significant levels of uncertainty in the results. This paper presents a numerical study where the signal from the experimental two-color pyrometry technique in a marine diesel engine reference experiment is reconstructed employing computational fluid dynamics (CFD) and a detailed Line-by-Line (LBL) spectral radiation model. The analysis is aimed at qualitatively supporting interpretability of experimental observations. Further, the role of soot and temperature gradients along and normal to the line of sight are assessed in two canonical

Geringer, Stefan, Haworth, Daniel, Boulouchos, Konstantinos, von Rotz, Beat, Bolla, Michele, Mazzetta, Marco

Cold Flow Simulation of a Dual-Fuel Engine for Diesel-Natural Gas and Diesel-Methanol Fuelling Conditions

2021-01-0411

04/06/2021

In this work, the possibility to perform a cold-flow simulation as a way to improve the accuracy of the starting conditions for a combustion simulation is examined. Specifically, a dual-fuel marine engine running on methanol/diesel and natural gas/diesel fueling conditions is investigated. Dual-fuel engines can provide a short-term solution to cope with the more stringent emission legislations in the maritime sector. Both natural gas and methanol appear to be interesting alternative fuels that can be used as main fuel in these dual-fuel engines. Nevertheless, it is observed that combustion problems occur at part load using these alternative fuels. Therefore, different methods to increase the combustion efficiency at part load are investigated. Numerical simulations prove to be very suitable hereto, as they are an efficient way to study the effect of different parameters on the combustion characteristics. These simulations often describe the engine with a limited engine geometry

Decan, Gilles, De Buyzerie, Bert, Lucchini, Tommaso, D'Errico, Gianluca, Verhelst, Sebastian

Effect of Intake Air Hydrogenation Coupled with Intake Air Humidification on Combustion and Emissions of Marine Diesel Engine

2021-01-0502

04/06/2021

The purpose of this study is to investigate the effect of intake air hydrogenation coupled with intake air humidification (IAH) on the combustion and emission of marine diesel engines. A 3D numerical model of four-stroke turbocharged intercooled marine diesel engine was established by using commercial software AVL-Fire. The effects of hydrogen and water injected into the intake port on engine in-cylinder combustion and emission characteristics at 1350 r/min and partial load were studied. The novelty of this study is to combine different hydrogen-fuel ratios and water-fuel ratios, so as to find the optimization method that can reduce NOx and soot emissions and ensure the thermal efficiency of the engine doesn’t decrease. The results show that by injecting a small quantity of hydrogen (the ratio of hydrogen mass to diesel mass is 1.40%) into the intake port of diesel engine as the activator of in-cylinder combustion, the indicated specific fuel consumption (ISFC) of diesel is reduced by

Zhao, Changpu, Bian, Zhishang, Kong, Shiru, Cai, Yujie

Recurrent and Time-Delay Neural Networks as Virtual Sensors for NOx Emissions in Marine Diesel Powertrains

2021-01-5042

03/25/2021

Neural networks (NN) for marine engines, using raw measurement data from laboratory measurements, are developed and verified. These models can be utilized as virtual sensors of engine-out NOx emissions and lambda (λ). Investigations for the optimal NN configuration targeting models were carried so they can capture the dynamic behavior of a marine diesel engine, can generalize within the training range, and have the minimum complexity due to execution performance and portability reasons. Two configurations of NNs are investigated, the recurrent (RNN) and the time-delay neural network (TDNN). The resulting NN models are deployed on a prototype engine control unit (ECU) platform and are validated in real time for operating points and patterns that are not included in the training dataset. The real-time validation shows that the predicted quantities remain consistent in most operating areas and the dynamic behavior of the system is captured and reproduced accurately. The NN models were

Planakis, Nikolaos, Papalambrou, George, Kyrtatos, Nikolaos, Dimitrakopoulos, Pantelis

Emission Screening Test for Marine Outboard Engines

2021-01-5016

02/18/2021

The United States Environmental Protection Agency’s (U.S. EPA’s) National Vehicle and Fuel Emissions Laboratory (NVFEL) has been developing new approaches for use in screening emissions from various types of new and in-use (used) engines to investigate if their exhaust emissions comply with federal emission standards. If the results from screening tests suggest anything unusual, EPA’s compliance program could investigate further to determine if that particular engine group or family should receive more rigorous compliance testing and analysis. In 2019, the EPA finished developing a means to screen the emissions of marine outboard engines, including the use of specialized equipment, laboratory methods, and procedures capable of controlling outboard marine engines to screen whether their exhaust is in line with appropriate emission standards. This paper describes the purpose of the new screening tests and the test articles, which can be tested, as well as the design of the test cell

Stuhldreher, Mark, Kargul, John, Moskalik, Andrew

Marine Carburetors and Fuel Injection Throttle Bodies

J1223_202012 (Current)

12/09/2020

This SAE Recommended Practice covers all carburetors and throttle bodies used on permanently installed gasoline marine engines

Marine Engine Fuel Systems Committee

Test Cell Instrumentation

AIR5026B (Current)

10/21/2020

This document discusses, in broad general terms, typical present instrumentation practice for post-overhaul gas turbine engine testing. Production engine testing and engine development work are outside the scope of this document as they will typically use many more channels of instrumentation, and in most cases will have requirements for measurements that are never made in post-overhaul testing, such as fan airflow measurements, or strain measurements on compressor blades. The specifications for each parameter to be measured, in terms of measurement range and measurement accuracy, are established by the engine manufacturers. Each test cell instrument system should meet or exceed those requirements. Furthermore, each instrument system should be recalibrated regularly, to ensure that it is still performing correctly

EG-1E Gas Turbine Test Facilities and Equipment

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