Three-dimensional modeling and exergy analysis in Combustion Chambers of an indirect injection diesel engine

In this investigation, the energy and exergy analyses are carried out in pre and main chambers of a Lister 8.1 indirect injection diesel engine (IDI) diesel engine for two loads (BMEP of 2.96 bar and 5.9 bar as 50% and full load operations) at maximum torque engine speed (730 rpm). The energy analyses are carried out during a closed engine cycle by using a computational fluid dynamics (CFD) code. The results for the pressure in cylinder for two loads are compared with the corresponding experimental data and show good agreement. Also, for the exergy analysis in the chambers, a developed in-house computational code is applied. Various exergy components are identified and calculated separately with crank position at both loads. The results show that at partial and full load operations 56% and 77% of total irreversibility are related to combustion process in main chamber, respectively. This work demonstrates that multidimensional modeling can be used at complex chamber geometry to gain more insight into the effect of flow field on the combustion process accounting for the second-law of thermodynamics.