Prediction of Instantaneous Heat Flux in an Internal Combustion Engine

Abstract

Prediection of instantaneous heat flux to a cylinder head surface in a direct injection Diesel engine has been made, solving the energy-conservation equation for the one-dimentional unsteady thermal boundary layer in the cylinder. The authors have proposed a simple algebraic expression for equivalent thermal conductivity, taking into account the heat transfer of turbulent eddy and its enhancement due to combustion. The results show good agreement with the measurements of instantaneous heat transfer rates for a typical position on the cylinder head surface in a non-swirl engine, over the fairly wide range of operating conditions.