密闭金属空腔中多孔介质相变耦合传热模型研究

Study on the Coupled Heat Transfer Model of Porous Media in Enclosed Metallic Cavity

针对外加瞬间高能热源,由密闭金属空腔、腔体中多孔介质、多孔介质中可相变工质组合成的耦合态目标传热特性在航空航天领域的特殊应用需求,基于金属腔体、多孔介质中不可压缩流动相变工质的能量守恒、动量守恒、质量守恒等原理,以低气压环境下应用的复杂物理结构的密闭金属腔体为研究对象,建立了由高能高效热源-金属空腔-多孔介质-多孔介质中可相变工质的相变过程的传热特性的数值计算模型,通过典型物理参数状态的仿真,获取了密闭腔体内温度、压力、相变等特征参数随时间和空间变化的数值模拟结果,关键参数的仿真结果与已有试验结果对比一致性好,同时温度、压力、相变等特征参数的变化规律与传热传质理论相吻合。结果表明该建模方案思路的正确性以及仿真结果的有效性。该传热模型可推广应用于激励热源的优化设计、密闭耦合态目标的综合性能优化。

Aiming at the heat source with external instantaneous high energy.According to the special requirements in the field of aerospace,the heat transfer characteristics of the variegated medium coupling state target’s are studied by considering the enclosed metal cavity,porous medium in the cavity,phase change in the porous media etc.The simulation model is obtained,based on the heat energy conservation,momentum conservation and mass conservation principle,and the heat-transfer mode is supposed from heat source to metal cavity,then to metal cavity porous medium,porous medium’s phase,its heat-transfer and so on.The parameters of temperature,pressure,velocity and phase change are computed,and the results are in conformity with tests also with theory of heat transfer medium as the incentive heat source is constant.This reveal the heat-transfer mode is right and the simulation model is valid.The heat transfer model can be popularized and applied to the optimization design of incentive heat source.