相变常数对反应射流气羽影响的数值研究

Numerical Investigation on the Effect of Phase Change Constant on Reaction Jet Plume

以Li-SF_(6)反应射流为能量来源的闭式循环动力系统在水下推进以及航空航天等领域具有广阔的应用前景。本文在欧拉模型和组分输运模型的基础上,结合涡耗散反应速率模型和Lee相变模型对Li-SF_(6)反应射流过程进行了三维稳态计算,研究了相变常数对反应射流流场以及气羽结构的影响。研究结果表明,反应射流气羽穿透长度随蒸发常数的增加而增加,随凝结常数的增加而减小;在蒸发常数为10^(4)以及凝结常数为10^(6)下,气液界面与饱和温度分布一致,模拟计算结果与实验结果符合较好。本文研究结果将为Li-SF_(6)反应射流的数值模拟奠定基础,也将对Li-SF_(6)射流反应器的设计和安全运行提供指导。

The closed cycle power system with Li-SF_(6) reaction jet as its energy source has wide application prospects in underwater propulsion,aerospace and other fields.In this paper,the three-dimensional steady simulation of Li-SF_(6) reaction jet is carried out by combining the eddy dissipation reaction rate model and the Lee phase change model based on the Euler model and species transport model,and the effects of phase change constant on the flow field and structure of jet plume are investigated.The results indicated that,penetration length of the reaction jet plume increases with the increase of evaporation constant and decreases with the increase of condensation constant.When the evaporation constant is 10^(4) and condensation constant is 10^(6),the gas-liquid interface is consistent with the saturation temperature distribution,which indicates a good agreement of the simulation with the experimental results.Results of this study will lay a foundation for the numerical simulation of Li-SF_(6) reaction jet,and will be helpful for the design and safe operation of Li-SF_(6) jet reactor.