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李中华, 李志辉, 吴俊林. 真空羽流中相变过程DSMC仿真方法研究[J]. 力学学报.
引用本文: 李中华, 李志辉, 吴俊林. 真空羽流中相变过程DSMC仿真方法研究[J]. 力学学报.
RESEARCH ON DSMC NUMERICAL METHOD OF PHASE TRANSITION IN VACUUM PLUME[J]. Chinese Journal of Theoretical and Applied Mechanics.
Citation: RESEARCH ON DSMC NUMERICAL METHOD OF PHASE TRANSITION IN VACUUM PLUME[J]. Chinese Journal of Theoretical and Applied Mechanics.

真空羽流中相变过程DSMC仿真方法研究

RESEARCH ON DSMC NUMERICAL METHOD OF PHASE TRANSITION IN VACUUM PLUME

  • 摘要: 为了研究真空羽流中水蒸气的相变产物冰晶对羽流红外信号、侵蚀等污染效应的影响,开展羽流中相变过程的数值模拟方法研究。基于稀薄两相羽流双向耦合DSMC方法,采用经典成核理论,建立了真空羽流的相变过程的数值仿真方法。通过对水蒸气在拉法尔喷管中自凝结试验的仿真,对经典成核理论进行了修正,对成核率给出了103的修正因子,得到与试验符合的仿真结果,表明对成核理论修正后,可以应用到稀薄流动的数值模拟中。对某发动机真空羽流相变流场的仿真,在核心区得到与CFD相近的结果。仿真结果表明,在羽流流场中,由于相变,存在较多的冰晶颗粒,在真空环境下,随着羽流向倒流区无限制膨胀,倒流区流场内也会出现一定数量的冰晶颗粒。颗粒在空间的数密度、尺寸等分布与气相分布存在差异,需要开展相关污染效应的影响研究。

     

    Abstract: Numerical method of phase transition in vacuum plume is studied to research the contamination effects of infrared and erosion caused by ice crystal particles produced from vapor in plume. Based on two way coupled DSMC method used in rarefied two phase plume, the numerical method of phase transition in vacuum plume is modeled by using classical nucleation theory. The vapor spontaneous condensation in a Laval nozzle test cases are simulated, then the classical nucleation theory is modified by setting nucleation rate a correction factor of 103. The simulation results are good agreement with those of experiment. This means that the modified classical nucleation theory can be used in numerical simulation of rarefied flow. The vacuum plume with phase transition of a thruster is simulated, and similar result with CFD in kernel flow is obtained. It is show that there are a number of ice crystal particles because of phase transition in plume field, and there are a certain amount of crystal in back flow with the unlimited expansion in vacuum. There are some difference of number density and size distribution of particle from gas phase. It is need to study the contamination effects of plume.

     

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