Exergy Analysis of a Diesel Engine using Multi-zone Combustion Model

Availability analysis provides useful information for optimizing the systems. In the present investigation, a multi-zone combustion model is developed to simulate diesel engine cycle.Then, the governing equations of availability analysis are applied in this model.The concept of chemical equilibrium based on Olikara and Borman method is used to calculate the concentration of combustion products.Chemical availability is considered as oxidation, reduction, and diffusion availabilities.The availability analysis is applied to the engine from the inlet valve closing (IVC) until exhaust valve opening (EVO).The effect of fuel injection timing is investigated by various availability terms. The results indicate that advancing time of injection increases work and heat transfer availabilities, but decreases irreversibility.