In this paper the in-cylinder air motion and its interaction with combustion are studied under both motored and firing conditions by LDA in a single-cylinder 4-valve S.I.engine.

• 在一台单缸四气门火花点火式发动机上，用激光多普勒测速仪分别在发动机着火和倒拖条件下测量和分析了燃烧室气流运动的规律。