Technical Paper
The Effect of Inlet Port Geometry on In-Cylinder Flow Structure
1985-02-01
850499
The paper describes a combined experimental-theoretical investigation into the intake flow produced by a port commonly used for both DI diesel and gasoline engines, namely a helical. The study consists of two major parts. Firstly, 3 orthogonal velocity components were measured under steady flow conditions within the valve gap using LDA. Data was obtained around the valve periphery and in different planes between the valve and the cylinder head. This was repeated for a number of different valve lifts. Prior to the second stage, an unsteady gas-dynamics calculation was performed to determine the thermodynamic conditions immediately upstream of the valve and the mass flow rate through the valve opening throughout the intake stroke.