The k - ε turbulence modelling of heat transfer and combustion processes in a Texaco controlled combustion stratified charge engine

Abstract

In this investigation, a model has been developed to predict the performance of a Texaco controlled combustion stratified charge engine (TCCS). This model uses the k - ε turbulence model to determine characteristic velocities for heat transfer calculations, which has only one empirical constant, in contrast to Woschni's equation in which separate constants are used for each process in the four-stroke cycle to determine the velocity for use in Reynolds number calculation. The modified Keck and Blizard model is used for combustion calculation by considering the rapid compression effects on turbulence intensity. Comparison of the model predictions with available experimental data shows a good agreement. Moreover, the program has a high flexibility for parametric studies to calculate performance parameters such as thermal efficiency, pressure, specific fuel consumption, temperature, fluid flow into and out of the cylinder, friction losses, heat transfer, flow field in the cylinder and so on.