Two Zone Combustion Model for SI Engines to Study the Variations in Cylinder Pressures and Temperatures between Adiabatic Combustion and Eichelberg’s Correlation

International Journal of Advanced Information Science and Technology (IJAIST) Vol.15, No.15, July 2013. 5 p. — ISSN: 23192682.Abstract - Computer simulation of SI engines is a useful tool to predict engine performance due to changes in input variables and also study the effect of phenomena like heat transfer to the engine performance. The paper describes the building of a thermodynamic two zone combustion model for SI engines to observe the theoretical deviation in cylinder pressure and temperature between a case of adiabatic combustion and a case using Eichelberg’s heat transfer correlation. The two zone model developed in MATLAB is a good platform to analyse such results as it can depict changes in peak burned gas temperature that single zone models can’t and saves on the long computation time required in multi zone models. Existing two zone models do not study the effect of heat transfer on the engine’s output. The work aims to find the deviation of engine cylinder pressure and temperature over a range of engine speeds and over the entire crank angle duration. The simulation shows that the pressure deviation was small compared to the temperature deviation, especially at higher engine speeds, where the peak pressure variations became negligible. The combustion model was verified using experimental data from referenced works.Keywords: Engine-Model-Combustion