k-epsilon equation for compressible reciprocating engine flows

An order-of-magnitude analysis has been applied to the basic equations for k and epsilon under engine running conditions with a view to identify important terms that appear during compression/expansion in engine cylinders. It has been found that some of the terms neglected in previous studies could be quite large, and modeling of these terms has been performed. Calculations have been carried out using the modified epsilon equation, and the results have been found to be more plausible physically than those obtained with an earlier version. It is noted that more experimental data are required for validation purposes.