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Noise and Vibration Optimization Using TMR Analysis for CI Engine Fueled by Blends of Simarouba Methyl Ester

SVPM COLLEGE OF ENGINEERING-Sangram Dashrath Jadhav
  • Technical Paper
  • 2019-01-1894
To be published on 2019-09-16 by SAE International in United States
Today’s frenetic engine manufacturing and transportation sector and its related traces viz; noise and vibration of our modern societies has adverse effect on environment as well as all of us. Generally, vehicle extensively tested to withstand against mechanical shocks, noise, vibration etc. While, accordingly make the provision such as suspension, dampers, air bags etc. still the problem of noise/vibration day-by-day incrementally arise and become severe with the age of vehicles. Noise/vibration is a controllable pollutant that deserves the attention were all the scientific community work hard for controlling their harmful effects. Modern research affords us the opportunity to understand the subject better and to develop advance technologies. Widely immediate slogan and goal of all industries might be to reduce Noise/vibration on predominantly basis while, make the quietest and smoothest running Engines. Noise/vibration cause and adverse effect on C.I engine, engine component and ultimately vehicle, may reduce the life of the engine. To, reduce the dependency on diesel fuel (Due to rapid worldwide depletion) Biodiesel is one of the immediate, alternative and complimentary solution. In the…
 

Optimization of CI Engine Performance and Emissions Fueled by Blends of Alternative Fuels Methyl Ester Using Taguchi and Multi Regression Analysis

Dr. D. Y.Patil Unitech Society's-Vijay javanjal
SVPM COLLEGE OF ENGINEERING-Sangram Dashrath Jadhav
  • Technical Paper
  • 2019-01-1893
To be published on 2019-09-16 by SAE International in United States
Today’s frenetic engine manufacturing and transportation sector and its related traces viz; noise and vibration of our modern societies has adverse effect on environment as well as all of us. Modern research affords us the opportunity to understand the subject better and to develop advance technologies. Widely immediate slogan and goal of all industries might be to improve the performance and reduce emission using alternative fuel while, make the quietest and smoothest running Engines. To, reduce the dependency on diesel fuel (Due to rapid worldwide depletion) Biodiesel is one of the immediate, alternative and complimentary solution. In the Present study, to optimize the operating parameters of the Direct Injection Single Cylinder (5.2 kw) CI engine with respect to Brake Thermal Efficiency (BTE), Carbon monoxide (CO), Oxides of Nitrogen, Hydrocarbons (HC) etc.. For this investigation, we used Biodiesel as an alternate fuel for diesel fuel which possesses low cetane number which is not sufficient to operate existing diesel engine. However, this could be combined with the diesel fuel in the form of blends. For this investigation…
 

Optimization of Compression Ratio for Direct-Injection Diesel Engine for better fuel economy.

Tata Technologies Ltd-Sujit Vithoba Gavade, Aashish Bhargava, Chandrakant Deshmukh, Gaurav Soni
  • Technical Paper
  • 2019-24-0165
To be published on 2019-08-15 by SAE International in United States
Fuel economy is becoming one of the key parameter as it not only accounts for the profitability of commercial vehicle owner but also has impact of environment. Fuel economy gets the benefitted from optimum compression ratio in modern engines. Increasing of compression ratio of any vehicle results in improvement of emission levels and performance. This paper evaluates the optimization of Compression ratio and study its effect on Engine performance. The parameters investigated in this paper includes include; combustion bowl volume in Piston, Cylinder head gasket thickness & Piston topping as these are major contributing factors affecting clearance volume and in turn the compression ratio of engine. Based on the calculation results, an optimum Compression Ratio for the engine is selected for further Verification.
 

Optimization of Multi Stage Direct Injection-PSCCI Engines

Università degli Studi della Basilicata-Annarita Viggiano, Vinicio Magi
  • Technical Paper
  • 2019-24-0029
To be published on 2019-08-15 by SAE International in United States
The more stringent regulations on emissions induce the automotive companies to develop new solutions for engine design, including the use of advanced combustion strategies and the employment of mixture of fuels with different thermochemical properties. The HCCI combustion coupled with the partial direct injection of the charge, in order to control the performance and emissions and to extend the operating range, is a promising technique. In this work an in-house developed multi-dimensional CFD software package was used to analyse the behaviour of a multi stage direct injection (DI)-partially stratified charge compression ignition engine fueled with PRF. A skeletal kinetic mechanism for PRF oxidation was employed, with a dynamic adaptive chemistry technique to reduce the computational cost and a model based on the partially stirred reactor model to couple turbulence and chemistry. Most of the fuel was injected during the intake stroke, in order to get a homogeneous mixture of fuel and air, whereas the remaining part was injected at the end of the compression stroke, in order to stratify the fuel and temperature distributions in…
 

PIV and DBI Experimental Characterization of Air flow-Spray Interaction and Soot Formation in a Single Cylinder Optical Diesel Engine using a Real Bowl Geometry Piston

GM Global Propulsion Systems-Alberto Vassallo
General Motors Italia S.r.l.-Francesco Concetto Pesce
  • Technical Paper
  • 2019-24-0100
To be published on 2019-08-15 by SAE International in United States
With demanding emissions legislations and the need for higher efficiency, new technologies for compression ignition engines are in development. One of them relies on reducing the heat losses of the engine during the combustion process as well as to devise injection strategies that reduce soot formation. Therefore, it is necessary a better comprehension about the turbulent kinetic energy (TKE) distribution inside the cylinder and how it is affected by the interaction between air flow motion and fuel spray. Furthermore, new diesel engines are characterized by massive decrease of NOx emissions. Therefore, considering the well-known NOx-soot trade-off, it is necessary a better comprehension and overall quantification of soot formation and how the different injection strategies can impact it. The present study aims to define a methodology to analyze the velocity field and consequently TKE distribution as well as to characterize soot formation inside of a real bowl geometry considering different operating conditions. For that purpose, two different optical techniques were simultaneously applied in this study. On the one hand, in-cylinder velocity fields were measured by using…
 

Piston Bowl Geometry Effects on Combustion Development in a high-speed light-duty Diesel Engine

Ford Motor Company-Eric Kurtz
Sandia National Laboratories-Stephen Busch, Kan Zha
  • Technical Paper
  • 2019-24-0167
To be published on 2019-08-15 by SAE International in United States
In this work, we studied the effects of piston bowl design on combustion in a light-duty direct-injection diesel engine. Two bowl designs were compared: a conventional, omega-shaped bowl and a stepped-lip piston bowl. Experiments were carried out in the SNL single-cylinder optical engine facility, with a medium-load, mild-boosted operating condition featuring a pilot+main injection strategy. CFD simulations carried out with the FRESCO platform featuring full-geometric modeling of the engine, were validated against measured in-cylinder performance as well as soot natural luminosity images. Differences in combustion development were studied using the simulation results, and sensitivities to in-cylinder flow field (swirl ratio) and injection rate parameters were also analyzed. In-cylinder mixture formation analysis showed that ignition of the pilot injection mixture develops nearly as a homogeneous adiabatic reactor, being mostly advected, not mixed, by the bowl’s swirling motion, while its timing is influenced by the local flow field. Local in-cylinder flow is also more crucial than injection parameters to igniting the main injection’s premixed fuel, as it determines the relative overlap with the high-temperature pilot ignited mixture.…
 

Possibilities of wall heat transfer measurements at a supercharged Euro IV heavy-duty Diesel engine with high EGR-rates, an in-cylinder peak pressure of 250 bar and injection pressure up to 2500 bar

Daimler AG-Christian HENNES, Jürgen Lehmann
KIT Karlsruhe Institute Of Technology-Thomas Koch
  • Technical Paper
  • 2019-24-0171
To be published on 2019-08-15 by SAE International in United States
A raise of efficiency is, especially for CV, the strongest selling point concerning the TCO. Accompanied by legislations, with contradictive development demands, satisfying solutions have to be found. The analysis of energy losses in modern engines shows three influencing parameters. The losses resulting from taking real gas properties and non-ideal combustion into account have only a limited potential for gains, wall heat losses are currently believed to have the highest optimization potential. Critical for the occurrence of these losses is the wall heat transfer, which can be described by coefficients. To reduce WHT accompanying losses a decrease of energy transfer between combustion gas and combustion chamber wall is necessary. A measurement of heat fluxes is needed to determine the WHT relations at the combustion chamber of an engine. Methods to reduce the WHT can be developed and their effectiveness can be evaluated. As this is not done before for a heavy-duty engine, with peak pressures up to 250 bar, an increased in-cylinder turbulence and high EGR-rates is presented the following. The different methods to determine…
 

Predictive CFD auto-tuning approach for in-cylinder EU6 LDD DI engine

Ricardo UK Ltd-Kenan Mustafa, Andy Ward, Nicholas Winder
Univ. of Brighton, Ricardo UK, Ltd.-Daniel Melusi Nsikane
  • Technical Paper
  • 2019-24-0033
To be published on 2019-08-15 by SAE International in United States
Tightening emission regulations and accelerating production cycles force engine developers to shift their attention towards virtual engineering tools. When simulating in-cylinder processes in commercial LDD DI engine development, the trade-off between runtime and accuracy is typically tipped towards the former. High-fidelity simulation approaches which require little tuning would be desirable but require excessive computing resources. For this reason, industry still favours low-fidelity simulation approaches and bridges remaining uncertainties with prototyping and testing. The problem with low-fidelity simulations is that simplifications in form of sub-grid-scale (SGS) models introduce multivariable tuning parameter dependencies which, if not understood, impair the predictive nature of CFD simulations. In previous work the authors have successfully developed a boundary condition dependant input parameter table. This parameter table showed outstanding results for lab-scale experiments for over 40 varying operating conditions. The objective in this paper is first to identify the necessary considerations to adjust for the inherent differences between lab-scale and real engine conditions and then implement this parameter table into industry relevant conditions. With this approach the appropriate simulation setup for of…
 

Oil Cooler Removal from Light duty Diesel Engines for Cost Reduction purpose.

Tata Technologies Ltd-Aashish Bhargava
Tata Technologies, Ltd.-Shirish Madan Deshpande
  • Technical Paper
  • 2019-24-0175
To be published on 2019-08-15 by SAE International in United States
Automotive industry is going through phase where Energy efficiency and Cost is major differentiator in market. Taking up these considerations, development has been taken to improve thermal management of engine while optimizing the cost of engine. One of the important area in thermal management of Engine is Engine Lubrication system. This consist of Engine oil and oil cooler, which play vital role in thermal management as well as optimization of frictional losses by ensuring proper lubrication and cooling of engine components. For better thermal management of engine, a lubrication system is designed without Oil cooler, proto type made and tested. This paper deals with evaluation of various engine performance parameter & Thermal management with respect to modification carried out. Further solution of Oil cooler removal is validated at vehicle level to understand real world behaviour of the system. Finally test results were compared for further optimization in lubrication system. It was concluded that Oil cooler can be removed from the engine by doing optimization in thermal management of the engine.
 

Ignition Delay Model of Multiple Injections in CI engines

Seoul National Univ.-Youngbok Lee, Seungha Lee, Kyoungdoug Min
  • Technical Paper
  • 2019-24-0071
To be published on 2019-08-15 by SAE International in United States
In compression ignition engines, the combustion starts after the ignition delay period from the start of injection. The degree of mixing between air and fuel during the period have an impact on the combustion characteristic such as pressure rise rate which can worsen the combustion noise. The formation of particulate matter and nitrogen oxides also can be affected. In addition, ignition delay is required when estimating the in-cylinder pressure since it can provide information about the start of combustion. Therefore, a semi-empirical and 0-dimensional ignition delay model has been developed in this study for real-time control applications. As the ignition delay consists of physical and chemical delays in CI engines, the integrated ignition delay model established in this paper considered both of them. In this study, the ignition delay could be correlated with parameters such as in-cylinder charge density, local temperature and oxygen concentration at which the fuel is injected, injection pressure and quantity of the fuel injected previously. The model could be applied to multiple injection condition which is a common strategy among the…