3D coupled computations in engine's cylinder head, cooling circuit and combustion chamber

摘要

The aim of this study is to predict the 3D thermal field of the cylinder head, the combustion chamber and the cooling circuit of a simplified spark ignition engine. In addition, we expect a better calculations of the combustion and the pollutants formation than the usual calculations of the single combustion chamber. To achieve this goal, we have develop and validate a thermal coupling algorithm, which is using our CFD codes (KIVA-MB and FLUENT-UNS) as is. Calculations are performed on a NEC SX5 for the combustion chamber calculation and on an SGI O2000 for the cooling circuit, the cylinder head and the coupling algorithm. Comparisons between coupled and uncoupled calculations show a real impact of the coupling on local values (such as species concentration, turbulent intensity and temperature), but not on global one (such as average pressure or burnt mass fraction).