Analysis of the Effect of the Combustion Process on the Convective Heat Transfer in a Cylinder of a Marine High-Speed Diesel Engine

Abstract—Until recently, when improving the existing mathematical models of local heat transfer in the combustion chamber of marine high-speed diesel engines, it was believed that the fuel combustion process has a strong effect on the parameters of convective heat transfer. However, modern experimental studies have shown that this effect is insignificant. The experimental convective heat fluxes obtained during the operation of a marine high-speed diesel engine on fuel and under pure compression differ by an average of 6–10%. The purpose of this article is to present and discuss the results of an analysis of the effect of the combustion process on the convective heat transfer in a cylinder of a marine high-speed diesel engine. The experimental data presented in the article show that the formation of the thermal load of the cylinder–piston group during the period of active heat generation is determined mainly by radiative heat exchange. This gives designers and researchers the opportunity to create mathematical models describing the processes of local heat exchange in the combustion chamber of marine high-speed diesel engines with greater accuracy and to reduce the time of experimental debugging of new samples.