3D simulation of close cycle of spark ignition gas engine and investigation on effects of combustion chamber geometry on power and emissions

Internal combustion engines are used as stationary engines in factories and power plants for a long time. In recent years, the demand for environmental protection and the use of alternative fuels have excited the product market to the power generation systems using heavy duty gas engines. This research activity investigates the effect of piston bowl depth on the performance and emissions of gas engines. Towards this purpose, 3D computational fluid dynamic is used to simulate the cycle engine. By implementing the equations of combustion, turbulence and pollution, close cycle of engine is simulated and the results are presented as graphs and contours. Firstly, results are validated with experimental data and the by simulating of three different pistons, their pressure and temperature inside the cylinder and their amount of emissions are compared.The results show that combustion chamber which creates best mixing and optimum turbulence has the best performance and releases lower emissions.