[디젤엔진부문] 디젤 엔진의 포트 유동 시험 모사

Due to the simplicity steady port flow rig tests are routinely conducted during cylinder head development process to assess the in-cylinder air motion which has a strong influence on the performance, efficiency, and exhaust emissions of the diesel engines. The flow through the intake port and valves of a cylinder head on the rig is numerically simulated in order to firstly confirm the validity of the computational flow dynamic software before attempting to compute the unsteady flow through a running engine and to appreciate the correlation between the flow in the working engine and the flow through the port flow rig. The simulation is found to closely predict the flow coefficient and swirl numbers at low valve lifts. but to underestimate them at high valve lifts.