Entropy Generation in a Diesel Engine

M. Yavuz ÇONKAR

Faculty of Naval Architecture and Ocean Engineering
Istanbul Technical University, Maslak, Istanbul, Turkey
myconkar@softhome.net

O. Azmi ÖZSOYSAL

Faculty of Naval Architecture and Ocean Engineering
Istanbul Technical University, Maslak, Istanbul, Turkey
ozsoysal@itu.edu.tr

Abstract

The scope of this study can be summarized as investigating the entropy generation in a diesel engine and its effects on the operational performance characteristics. For this purpose, a preliminary tested Computer Code has been utilized to simulate the time-dependent flow phenomena during the intake and exhaust phases at manifolds and also the cylinders of a diesel engine based on a "non-homentropic flow model" by means of first law analysis. Adding the second law analysis to upgrade the Computer Code, first and second law could perform analysis for a high-speed turbocharged marine diesel engine; then entropy generation in the cylinders has been calculated. The effects of different engine parameters like compression ratio, motor speed and intake manifold temperature on the major performance characteristics such as entropy generation in system, total entropy generation, first and second law efficiencies were shown in graphics. The comparison of the results with the ones in the literature was in a good agreement.