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以补燃循环液氧煤油发动机系统为研究对象,对其强迫起动特性进行了研究.建立了描述补燃循环发动机瞬变过程的数学模型,提出了求解推进剂供应管路瞬变流控制方程的Chebyshev伪谱方法.采用新的面向对象仿真语言Modelica,建立了可扩展的发动机仿真模型库,在MWorks平台上,利用模型库搭建了补燃循环液氧煤油发动机仿真模型.对发动机强迫起动过程进行了仿真计算,计算结果与试车数据基本相符,其中稳态相对误差小于4%,动态相对误差小于10%,初步验证了模型的正确性.进一步分析了火药起动器工作时间、阀门打开时序等因素对发动机起动过程的影响.结果表明,为保证该发动机可靠起动,发生器点火应在氧化剂头腔充填完成后,火药起动器工作时间应持续到发生器点火.
A study was carried out on the forced start-up characteristics of the fuel-air-oxygen-kerosene engine system, and a mathematical model describing the transient process of the burn-in cycle engine was established. The solution to transient flow control equations of the propellant supply line Chebyshev pseudospectral method.Using the new object-oriented simulation language Modelica, an extensible engine simulation model library was built.On the MWorks platform, a simulation model of the make-up cycle liquid oxygen-oxygenated kerosene engine was built by using the model library.The engine forced start-up process The simulation results show that the relative error is less than 4% and the dynamic relative error is less than 10%, which proves the correctness of the model.Further analysis of the working time of the propellant starter, valve opening timing and other factors On the engine start-up process.The results show that, in order to ensure the reliable starting of the engine, the ignition of the generator should be completed after the oxidant head cavity filling, the working time of the powder drug starter should be continued until the generator ignites.