基于微重力条件下的导热控制微分方程，采用焓法对热管吸热器相变材料容器进行了二维数值建模与仿真，在同时考虑空穴和相变的情况下，对微重力条件下蓄热单元相变传热进行了模拟计算，分析了空穴率对蓄热容器内部的温度场和热性能的影响，并将计算结果同美国航空航天局（NASA ）方案热管吸热器蓄热单元相变传热计算结果进行了比较，验证了文中微重力条件下计算模型的合理性与准确性。研究结果表明：空穴影响着蓄热单元相变的进程，空穴的存在增加了容器内部的温度梯度，使得容器的蓄热能力降低；由于热管径向温差较小，热管壁温在相变材料熔点附近变化较小，从而在一定程度上能缓解热斑和热松脱现象。%High temperature heat pipe receivers are commonly used as a core component of space solar dynamic power system . On the base of heat conduction governing differential equation under microgravity , two‐dimensional numerical analysis of PCM container was conducted by a enthalpy method . With both void cavity and phase change considered , thermal performance of heat pipe receiver was analyzed . Numerical results were compared with NASA results . The accuracy of calculation model under gravity was verified .The results indicate that void cavity influences the process of phase change . T he void cavity reduces the utility and thermal storage ability of PCM . The temperature gradient of PCM zone is very significant because of the void cavity . The PCM contained in the integrated heat pipe performs the averaging function of the heat loads . Normal working of wick ensures the uniformity of heat pipe , thus heat pipe receiver alleviates thermal spot and thermal ratcheting .
展开▼
