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. 在一臺單缸四氣門(mén)火花點(diǎn)火式發(fā)動(dòng)機上,用激光多普勒測速儀分別在發(fā)動(dòng)機著(zhù)火和倒拖條件下測量和分析了燃燒室氣流運動(dòng)的規律。