A Method for Predicting Three-Dimensional Flow Characteristics during the Intake Process in Four-Stroke Cycle Internal Combustion Engines

Abstract

In this paper, a practical method of analysis is described for numerically predicting the three-dimensional flow characteristics such as swirl during the intake process in four-stroke cycle engines. The method is based on the one-dimensional calculation of the gas exchanging process and on the three-dimensional calculation of the gas flow in each region of the intake port and cylinder. The effect of the intake port configuration on the induction swirl intensity and volumetric efficiency can be examined efficiently by this method. Some calculations have been carried out for the case where the configuration of a helical port has been changed systematically. The feasibility has been shown through simulating the variation of the flow characteristics at the intake valve outlet owing to the change of the intake port configuration.