Calculation of radiative-convective heat transfer in the combustor of diesel engine

An integral method is suggested for the calculation of local heat transfer in the cylinder of diesel engine in view of radiation-convection interaction. The turbulent boundary layer is investigated on the combustor surface of arbitrary curvature subjected to the flow of a working medium which radiates and absorbs thermal energy. The thermal radiation transfer is described within the Schwarzschild model. Integral relations of boundary layer are used for solving equations of complex heat transfer. The integral characteristics of radiative heat transfer in the combustor of a diesel engine are determined (emissivity factor of the working medium, Bouguer and Boltzmann numbers, attenuation factor, and coefficient allowing for the diffuseness of radiation). The calculated values of local radiative-convective heat flux on the combustor surface are in good agreement with the experimental data obtained in a high-speed diesel engine under conditions of bench tests.