补燃循环火箭发动机气液同轴式喷嘴声学特性研究

基于经典声学和振动理论，运用流体动力学基本方程描述燃气通道内气体的波动现象，建立了双组元同轴直流离心式气液喷嘴声学特性分析的物理、数学模型，采用四端网络方法进行了计算。对单喷嘴声学模拟试验结果进行了分析。结果表明，所建声学特性分析模型用于分析喷嘴波动过程是可行的；合适的通道长度和节流嘴直径对液氧／煤油补燃循环发动机高频燃烧不稳定性有明显的阻尼作用。

Investigation on Acoustic Characteristics of Gas-Liquid Coaxial Injector of Staged Combustion Rocket Engine

Based on the fundamental acoustic and vibration theories,a physical and mathematical model of the acoustic characteristics for a bipropellant gas-liquid coaxial swirl injector was developed.The general form fluid dynamic governing equations were adopted to deal with acoustic wave in the model.The four-poles net method was used to solve the equations.The experimental results of a single injector have been analyzed and discussed.The results showed that the appropriate channel length and the diameter of the entrance throttle of the injector would evidently restrain the high-frequency combustion instability of LOX/RP-1 propellant rocket Engine.