利用摄像机拍摄和重放，观察和研究柴油机水下排气从管口到水面气液两相流动状态及管口气泡形成、上浮和破碎整个物理过程。发现，整个两相流动状态可明显地分成气泡形成、自由气泡、气泡云及水面喷涌四个区域。若对两相流动状态的轮廓平均，则类似于浮力射流结构。水介质以一定速度流动时，从水下排气口到水面气液两相流的流动状态相似，而流动轨迹与静水中的情况不同。 The use of camera shooting and playback, observation and research diesel underwater exhaust from the nozzle to the surface of the gas-liquid two-phase flow state and bubble formation, floating and crushing the entire physical process. It is found that the whole two-phase flow state can be divided into four areas: bubble formation, free bubble, bubble cloud and surface spewing. If the contour of the two-phase flow state is averaged, it is similar to the buoyancy jet structure. When the aqueous medium flows at a certain speed, the flow of gas-liquid two-phase flow from the underwater exhaust port to the water surface is similar, and the flow path is different from that in still water.