Technical Paper
A Cycle Simulation Including the Second Law of Thermodynamics for a Spark-Ignition Engine: Implications of the Use of Multiple-Zones for Combustion
2002-03-04
2002-01-0007
A thermodynamic cycle simulation using multiple zones for the combustion process was used to obtain the performance, energy and availability characteristics for an automotive spark-ignition engine. In addition to the traditional formulations based on the first law of thermodynamics, the simulation also included considerations based on the second law of thermodynamics. The characteristics of the engine combustion process and the impact of the multiple-zone formulation were determined. The burned gases were divided into an adiabatic core and boundary layer. The heat transfer of the burned gases was assigned in total to the boundary layer. From the start of combustion until 90°aTDC, the difference between the temperatures of the adiabatic core and the burned gases increased from zero to about 250 K. The implications of this temperature increase on nitric oxide computations are discussed.