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通过建立液体发动机稳态工作模型与热力计算模型,利用最小二乘优化与迭代计算的方法,仿真研究了被空气部分氧化的偏二甲肼(UDMH)对泵压式液体火箭发动机的影响规律。结果表明,随着UDMH中二甲胺、偏腙和水含量的增加,推进剂混合比略有升高,发动机推力、燃烧室压强和燃烧室温度等参数有较明显下降。与传统地单纯分析推进剂能量性能相比,此方法更能准确表征在火箭发动机系统复杂的调节机制作用下,变质推进剂对发动机工作性能的影响。
The steady-state working model and thermodynamic calculation model of liquid engine were established. The effects of UDMH partially oxidized by air on pumping-pressure liquid propellant rocket engine were simulated by least square method and iterative method. The results showed that with the increase of the content of dimethylamine, hydrazone and water in UDMH, the mixing ratio of propellant increased slightly, and the parameters of engine thrust, combustion chamber pressure and combustion chamber temperature decreased obviously. Compared with the traditional analysis of propellant energy performance, this method can more accurately characterize the effect of metamorphic propellant on engine performance under the complex regulation mechanism of rocket engine system.