喷口长度对离心喷嘴雾化特性的影响

Effects of spout length on spray characteristic of swirl injector

关键词:  液体推进剂火箭发动机  离心喷嘴  喷口+  喷雾特性

Key words:  Liquid propellant rocket engine  Centrifugal injector  Spout~+  Spray characteristics

摘要:

为了研究喷口长度对离心喷嘴雾化特性的影响,对长喷口离心喷嘴内部流动状况进行了理论分析。采用高速动态测量分析系统,以水为模拟介质,对离心喷嘴流量、液膜展开角、喷雾场轴向速度等参数在不同压降工况下,随喷口长度的变化进行了试验研究。结果表明:喷口长度的增加使离心喷嘴流量增大、液膜展开角减小、喷雾场轴向速度降低;推导了长喷口离心喷嘴流量系数和液膜展开角的经验公式,该公式可供实际工程应用参考。

Abstract:

To investigate the effects of spout length on characteristics of swirl injector, the liquid film flow on the inner wall of the long spout swirl injector was been analyzed theoretically. With water as the simulating media, parameters of swirl injector with different spout length such as mass flow rate, sheet cone angle and axial velocity of liquid film were measured on the condition of different pressure difference by the high speed dynamic measuring system. In conclusion, with the increase of the spout length, mass flow rate of swirl injector will increase and the axial velocity and sheet cone angle will decrease. The empirical equations of the flow rate coefficient and the sheet cone angle were deduced, which can be used in the practical project as a reference.