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建立了描述富氧燃气发生器动态特性的线性化频域模型,以分析推进剂流量扰动对发生器室压的动态作用.通过与文献中试验数据对比,验证了模型和计算方法的合理性.在低频范围内采用考虑熵波的绝热流动模型,比较煤油和液氧流量扰动引起发生器压力振荡的频率响应,结果显示煤油流量扰动更易引起较大的熵波幅值.分析了燃烧温度与混合比关系的无量纲斜率、涡轮压比系数和燃烧时滞对发生器频率特性的影响规律.在很宽的频率范围内分析发生器的动态特性,需采用考虑声学效应的分布参数模型,既能在低频范围内涵盖绝热流动模型,又能反映气路的纵向声学振荡.
A linearized frequency domain model describing the dynamic characteristics of oxygen enriched gas generator was established to analyze the dynamic effect of propellant flow disturbance on the generator chamber pressure. The comparison between the experimental data and the experimental data shows that the model and the calculation method are reasonable. The adiabatic flow model considering the entropy wave was adopted in the low frequency region to compare the frequency response of the pressure oscillations caused by the flow disturbance of kerosene and liquid oxygen.The results show that the turbulence of kerosene flow is more likely to cause larger entropy wave amplitude.The combustion temperature and mixing The relationship between the non-dimensional slope, the turbine pressure ratio and the combustion time delay on the frequency characteristics of the generator.Analysis of the dynamic characteristics of the generator in a wide frequency range, the need to use the acoustic parameters of the distribution model, both It covers the adiabatic flow model in the low frequency range and also reflects the longitudinal acoustic oscillations of the gas path.