3D Calculation of Fuel Wall-Wetting Process in an Engine Intake Port

Abstract

A conventional CFD calculation with a single shot of fuel injection cannot represent fuel behaviors in a port-injection engine because fuel is accumulated in an intake port through passed cycles. However, the multi-cycle calculation using 3D CFD is not practical because of the confounded long computational time. Supposed cyclic invariance of the gas flow field at an engine cycle steady state, a new calculation method is developed using one way coupling from air to fuel after second engine cycle. The computational time per cycle is reduced to one-tenth of conventional method by the proposed method.