가솔린 직접 분사 기관에서 가변 밸브 타이밍 시스템에 의한 내부 유동 특성에 관한 수치 해석적 연구

This research on the characteristics of internal flow by variable valve timing system was simulated by a commercial Fluent code and an optimized shape of intake/exhaust port or valves was discussed. The simulation was made by various valve timings with respect to crank angles. Complicated flow was visualized inside a cylinder and this may provide fundamental data in designing lean burn engine in future.