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以补燃循环液氧煤油发动机系统为研究对象,对其关机特性进行了研究。在分析发动机系统工作原理的基础上,应用模块化建模的思想,建立了该系统中各主要部件的数学模型;采用新的面向对象仿真语言Modelica和MWorks平台,开发了可扩展的发动机仿真模型库;在此基础上,利用模型库搭建了液氧煤油补燃循环发动机关机过程仿真模型,并对发动机关机过程进行了仿真计算,计算结果表明与试车数据基本相符,其中稳态相对误差小于5%,动态相对误差小于15%,初步验证了所建仿真模型的正确性;进一步分析了吹除气体压力、阀后腔道容积、关机工况等因素对发动机关机过程的影响。
In order to supplement the combustion liquid oxygen kerosene engine system as the research object, its shutdown characteristics were studied. Based on the analysis of the working principle of the engine system, the mathematical model of the main components of the system was established by using the idea of modular modeling. Based on the new object-oriented programming languages Modelica and MWorks, a scalable engine simulation model Based on this, the simulation model of shutdown process of LPG kerosene cycle engine was established by using model library, and the shutdown process of the engine was simulated. The calculation results show that it is consistent with the test data, and the steady-state relative error is less than 5 %, And the relative error of dynamic is less than 15%. The correctness of the simulation model is verified preliminarily. The influence of the purge gas pressure, the volume of the valve after the valve, and the shutdown condition on the shutdown process of the engine is further analyzed.