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A new appraisal of the thermomechanical behaviour of a hybrid composite brake disc in a formula vehicle

FORCE MOTORS, Pune , India.-Pradeep C
Sri Krishna College of Engg & Tech-Soundararajan R, Sathish Kumar K, Shanthosh G
  • Technical Paper
  • 2019-28-2572
To be published on 2019-11-21 by SAE International in United States
A new appraisal of the thermomechanical behaviour of a hybrid composite brake disc in a formula vehicle Research Objective This paper presents a hybrid composite brake disc with reduced Un Sprung Weight clearing thermal and structural analysis in a formula vehicle.Main purpose of this study is to analyse thermomechanical behaviour of composite brake disc for a formula vehicle under severe braking conditions. Methodology In the disk brake system, the disc is a major part of a device used for slowing or stopping the rotation of a wheel. Repetitive braking of the vehicle leads to heat generation during each braking condition. Based on the practical understanding the brake disc was remodelled with unique slotting patterns and grooves, using the selected aluminium alloy of (AA8081) with reinforcement particle of Silicon carbide (SiC) and Graphite (Gr) as a hybrid composite material for this proposed work. In First Phase of this Project work, By varying slotting pattern and groove angles the transient thermal and structural analysis using ANSYS workbench ,the hybrid composite disc plate of disk brake is done.The…

Development of low cost closed crankcase ventilation with oil mist separation system on light duty diesel engine.

Tata Technologies Ltd-Vishal Kailas Walhekar, Sujit Gavade, Gaurav Soni, Aashish Bhargava
  • Technical Paper
  • 2019-28-2578
To be published on 2019-11-21 by SAE International in United States
Currently automotive industry is facing bi-fold challenge of reduction in Greenhouse gases emissions as well as low operating cost. On one hand Emission regulations are getting more and more stringent on other hand there is major focus no customer value proposition. Engine blow by gases are one of the source of Greenhouse gases emission from engine. Blow by gases not only consist of unburn hydrocarbons but also carry large amount of oil. If oil is not separated from these gases, it will led to major oil consumption and hence increase total operating cost of Vehicle. In this paper, effort has been taken to develop a low cost closed crank case ventilation with oil mist separation system on diesel engine. For cost effective solution, two different design and configuration of oil mist separation system has been developed Further, engine with two different above said configuration has been tested for blow by gasses and oil consumption measurement on Engine test bed and vehicle to understand the behavior in real environment. Further results has been compare for both…

Sensitivity Analysis of the Combustion Parameters in a Stratified HCCI Engine with Regard to Performance and Emission

Mazandaran University of Science and Tech-Mohsen Pourfallah, Mahboud Armin
  • Technical Paper
  • 2019-24-0114
To be published on 2019-09-09 by SAE International in United States
Homogeneous charge compression ignition (HCCI) is a promised solution to environmental and fuel economy concerns for IC engines. Engine application for HCCI engine depends on an array of parameters such as fuel type, mixture composition, intake condition and engine specification, meaning that controlling an HCCI engine can only be done through the adjustment of these parameters. In this numerical study which is driven from an experimental work, thermal and charge stratification is used to control HCCI combustion. The effect of intake temperature, compression ratio, intake pressure, EGR, reformer gas (CO-H2 mixture) and glow plug temperature on engine performance and emission was investigated using a 3D model on AVL-FIRE parallel with 1D model on GT-Power software. Then AHP model as a multiple Attribute Decision making method has been used to analyze the sensitivity of these parameters on performance and emission. Results indicate that increasing intake temperature causes the operating condition approaches knock which results in a narrower operating region. Increasing EGR ratio makes possible the expanding of operating range rich limit since it causes delayed combustion…

Multi-Level Modeling of Real Syngas Combustion in a Spark Ignition Engine and Experimental Validation

C.M.D. S.p.A.-Domenico Cirillo
CNR Istituto Motori-Michela Costa, Gabriele Di Blasio, Daniele Piazzullo
  • Technical Paper
  • 2019-24-0012
To be published on 2019-09-09 by SAE International in United States
Syngas produced from biomass gasification is being increasingly considered as a promising alternative to traditional fuels in Spark-Ignition (SI) Internal Combustion Engines (ICEs). This gaseous fuel, composed by a mixture of CO, CH4, H2, CO2, N2 (and other minor hydrocarbon compounds), is however characterized by an extreme variability of its composition and a low energy density. In order to assure good energy performance and stability of operation as the syngas composition slightly changes, numerical modeling can give an important contribution as a tool to investigate the main parameters affecting the combustion process development and the formation of main pollutants. The present work introduces a multi-level set of numerical approaches to a SI ICE fueled with syngas deriving from biomass gasification. Combustion characteristics are investigated at different levels of increasing detail, aiming at giving a complete outlook over the influence of this non-conventional fuel on the engine performances and on its environmental impact. At first, a specific characterization of the dependency of the syngas laminar flame speed upon its composition is achieved through an iterative approach…

CFD Modeling and Validation of the ECN Spray G Experiment Under a Wide Range of Operating Conditions

Istituto Motori CNR-Marianna Migliaccio, Alessandro Montanaro, Luigi Allocca
Politecnico di Milano-Davide Paredi, Tommaso Lucchini, Gianluca D'Errico
  • Technical Paper
  • 2019-24-0130
To be published on 2019-09-09 by SAE International in United States
The increasing diffusion of gasoline direct injection (GDI) engines requires a more detailed and reliable description of the phenomena occurring during the fuel injection process. Currently, one drawback of GDI engines is represented by the impingement on the piston wall, due to typically adopted hollow-cone fuel sprays, which can lead to high emissions of unburned hydrocarbons and soot formation. Within this context, the extensive validation of multi-dimensional models by means of experimental data represents a fundamental task to accurately predict the physical phenomena characterizing the injected spray. The aim of this work was to simulate with OpenFOAM different operating conditions of the 8-hole, ECN Spray G injector placed into a constant volume vessel. The resulting developments of the jet plumes were assessed, along with the physical effects of injection pressure and wall temperature on the wall impingement phenomenon. Furthermore, different values of ambient temperature and pressure were investigated to validate the robustness of the proposed numerical set-up. A RANS, Eulerian-Lagrangian approach was adopted to couple the gas phase with the liquid jet and a complete…

Inverted Brayton Cycle as an Option for Waste Energy Recovery in Turbocharged Diesel Engine

Universita degli Studi dell Aquila-Davide Di Battista, Roberto Cipollone, Roberto Carapellucci
  • Technical Paper
  • 2019-24-0060
To be published on 2019-09-09 by SAE International in United States
Energy recovery in reciprocating internal combustion engines (ICE) is one of the most investigated options for the reduction of fuel consumption and GHG emissions saving in the transportation sector. In fact, the energy wasted in ICE is greater than that converted in mechanical form. The contribution associated to the exhaust gases is almost one third of the fuel energy, calling for an urgent need to be recovered into mechanical form. An extensive literature is oriented toward this opportunity, strongly oriented to ORC (Organic Rankine Cycle)-based power units. From a thermodynamic point of view, one option, not extensively explored, is certainly represented by the Inverted Brayton Cycle (IBC) concept and by the corresponding components which make possible this recovery. IBC is a thermodynamic (exhaust) gas cycle which considers an expansion (made by a turbine under the ambient pressure), an isobaric cooling and a compression in sequence which restores the pressure which is needed to evacuate the exhaust gases toward the atmosphere. Thanks to the expansion which decreases the pressure below the ambient pressure, mechanical work produced…

A Simple Approach for the Estimation of the Exhaust Noise Source at the Valves

CMT-Universitat Politècnica de València-Antonio J. Torregrosa, Pablo Olmeda
Renault SAS-Jean-luc Adam, Florent Morin, Maxime Dubarry
  • Technical Paper
  • 2019-24-0174
To be published on 2019-09-09 by SAE International in United States
Exhaust noise emission is the result of the propagation of pressure perturbations along the exhaust line. Such perturbations are primarily originated by the discharge of hot, high-speed gases through the exhaust valves. These gases do not simply displace the gases present in the exhaust port but compress them, giving rise to the perturbation mentioned above. Therefore, any attempt at the prediction of exhaust noise is based on the knowledge of the instantaneous mass flow rate across the exhaust valves. However, this magnitude is not readily accessible to measurements, and it is thus imperative to use predictive models. It is apparent that, while information on the instantaneous mass flow through the exhaust valves may be obtained from well-validated commercial gas-dynamic codes, the data required is not always available or fully defined at the time of starting the design of an exhaust line. It is therefore desirable to be able to estimate the instantaneous mass flow passing through the valve starting from a reduced set of geometrical and operation data, which can be either representative for a…

A Fundamental Study on Combustion Characteristics in a Pre-Chamber Type Lean Burn Natural Gas Engine

Waseda University-Masashi Tanamura, Shintaro Nakai, Mahoko Nakatsuka, Shota Taki, Kohei Ozawa, Beini Zhou, Ratnak Sok, Yasuhiro Daisho, Jin Kusaka
  • Technical Paper
  • 2019-24-0123
To be published on 2019-09-09 by SAE International in United States
Pre-chamber spark ignition technology can stabilize combustion and improve thermal efficiency of lean burn natural gas engines. During compression stroke, a homogeneous lean mixture is introduced into pre-chamber, which separates spark plug electrodes from turbulent flow field. After the pre-chamber mixture is ignited, the burnt jet gas is discharged through multi-hole nozzles which promotes combustion of the lean mixture in the main chamber due to turbulence caused by high speed jet and multi-points ignition. However, details mechanism in the process has not been elucidated. To design the pre-chamber geometry and to achieve stable combustion under the lean condition for such engines, it is important to understand the fundamental aspects of the combustion process. In this study, a high-speed video camera with a 306 nm band-pass filer and an image intensifier is used to visualize OH* self-luminosity in rapid compression-expansion machine experiment. The results show that the OH* self-luminosity is observed in outer edge of the jet, while the luminosity in the jet temporarily weakens because the turbulent jet is exposed to low temperature surrounding in…

Rubber: Butyl (IIR), Low Compression Set and Low Moisture/Gas Permeability, 65 to 75 Type A Hardness, for Seals in Desiccated or Other Systems Requiring Resistance to Gas and/or Water Vapor Permeation

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS7601
  • Current
Published 2019-07-18 by SAE International in United States

This specification covers a butyl rubber in the form of molded rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications. For sheet, strip, tubing, extrusions, and molded shapes use AMS3941 specification.


Etching of Fluoropolymer Insulations

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • ARP6167
  • Current
Published 2019-06-11 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) describes the etching of fluoropolymer electrical wire insulations to ensure that all facets of the process from the chemistry to the processing, to the storage and handling are well defined.
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