s Jafarmadar - Department of Mechanical Engineering, University of Urmia, Urmia, Iran,
r Barzegar - Department of Mechanical Engineering, University of Urmia, Urmia, Iran,

The combustion processes and emission formation in pre and main chambers of a Lister 8.1 IDI diesel are simulated with the Computational Fluid Dynamics (CFD) code. The model includes sprayatomization, mixture formation and distribution and subsequently the combustion processes. Emissionsformation modeling are carried out with considering of flow configurations in two chambers. A part load (50% load) and a full load simulation of engine are carried out. In addition, the amount of mass burning rate of fuel, temperature, heat losses and emissions formation in pre and main chamber arepresented with more details. The simulation results, such as the mean in-cylinder pressure and exhaust emissions are compared with the measured values and show good agreement. This work demonstrates that multidimensional modeling can be used at complex chamber geometry to gain more insight intothe flow field, combustion process and emissions formation. The simulation results show that the CFDcombustion simulation tool works quite correctly for the predicting combustion process and emission formation in Lister 8.1 IDI diesel engine

Main and Pre Chambers,Indirect Injection,Emission,Performance,Three Dimensional Modeling