压力波对垂直管低温气液掺混冷凝的影响

为了分析高压补燃液氧煤油发动机氧泵间管内气液两相掺混冷凝及其压力波传播过程,建立了可产生压力扰动的垂直管低温气液两相掺混实验系统,以氧气/液氧为实验工质,开展压力波对垂直管内低温气液两相掺混冷凝的影响研究,获得了不同压力波频率和氧气流量工况下的掺混图像,分析结果表明:压力波会使发散流型由微弱振荡冷凝向间歇振荡冷凝转变,使椭圆流型由稳定冷凝向振荡冷凝转变;在0~52 Hz不同频率压力波作用下,发散流型最大轴向冷凝长度与掺混孔径之比在10~30之间,椭圆流型的比值在8~15之间变化;压力波对气相摆动频率起主导性和正相关性的影响。

Research on influence of pressure wave on mixing and condensation of cryogenic gas-liquid two-phase flow in vertical pipe

In order to study the gas-liquid mixing and condensation as well as the pressure wave propagation in the oxygen pump pipe of the high pressure staged combustion LOX/kerosene rocket engine,a cryogenic gas-liquid mixing in vertical pipe with pressure wave experiment system was constructed.The research on influence of pressure wave on mixing and condensation of cryogenic gas-liquid two-phase in vertical pipe was carried out with oxygen/LOX as working fluid.Interphase mixing images of different pressure wave frequencies and oxygen flow conditions were obtained.The results show that the pressure wave makes the divergent flow pattern change from weak oscillation condensation to intermittent oscillation condensation,and makes the elliptical flow pattern change from stable condensation to oscillation condensation.Under the influence of pressure waves with different frequencies from 0 to 52 Hz,the ratio of the maximum axial condensation length to the orifice diameter of the divergent flow pattern varies between 10 and 30,and the ratio of the elliptical flow pattern varies between 8 and 15.The pressure wave plays a leading and positive correlation to the plume swing frequency.