Mixture Formation Process near Cavity Wall in a DI Diesel Engine with Transparent Cylinder and Piston

Abstract

The mixing of a diesel spray with air is generally determined by the injection parameters and characteristic of the air movement in the combustion chamber. The combustion chamber design can also help to form better mixtures. In this study, improvements in mixture formation was attempted by changing the combustion chamber geometry, injection pressure, and intake gas pressure in an actual diesel engine with transparent cylinder and piston arrangement. With this engine the front view and the side view photographs of the spray impinging on the wall and flowing over the bottom surface of combustion chamber were taken. From these results the overall air and fuel mass distributions were estimated.