:通常在发动机倒拖工况下测量和研究缸内气流运动 ,对于燃烧过程中缸内流动规律的测量和研究还很少。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。研究结果表明 ,在燃烧和排气阶段 ,缸内气流的平均速度与倒拖时有较大差别 ,而且燃烧速度越快 ,燃烧过程中气流运动速度的变化越剧烈。 : Measurement and study of the airflow in the cylinder are usually carried out under the condition of engine overturning. There are few measurements and researches on the law of the flow in the cylinder during the process of combustion. In a single-cylinder four-valve spark-ignition engine, laser Doppler velocimeters were used to measure and analyze the law of airflow in the combustion chamber under engine ignition and dragging conditions. The results show that in the combustion and exhaust stages, the average velocity of the in-cylinder airflow differs greatly from that during the drag-out phase, and the faster the combustion speed, the more severe the change of the airflow velocity during combustion.