플레넘 챔버 내의 유동 특성에 관한 실험적 연구

The MPI engine becomes increasingly popular because it meets two requirements of stringent pollutant emission and the lower fuel consumption. Even though MPI engine supplies the same amount of fuel to each cylinder, it is hard to precisely control the air-fuel ratio due to the different amount of air flowing into each cylinder. The uniformity of air-fuel ratio in each cylinder is considerably affected by the plenum chamber configuration. This study is focused on experimentally analyzing the flow characteristics within the plenum chamber. In the present experiment, steady and valve dynamic state flow tests are performed and the flow field inside the plenum chamber is visualized and measured by utilizing a laser sheet visualization technique and a PTV method. These measured results indicate that the flow structure in the plenum chamber is highly influenced by the plenum chamber configurations, suction flow rates, crank speeds and so on.