中文摘要：

通过对先进太阳能热动力发电系统单元热管吸热器进行研究,建立了相应的数学模型,给出了数值解法,运用计算流体力学软件对其进行了数值计算,得出单元管上蓄热容器的温度场,对其空穴热性能进行了分析,并将计算结果同国外相关实验结果进行了比较.计算结果表明,日照期内,靠近容器两侧壁的PCM（phase change material）首先熔化,并逐渐沿轴向向内推进,由于空穴热阻远大于容器侧壁热阻,因此容器侧壁在整个PCM容器的换热过程中发挥了重要作用;阴影期内,容器中的温度分布都是从中心到外部降低,空穴的存在使得容器的蓄热能力降低,有空穴时容器各处的温度较低.空穴的存在影响着PCM相变的进程,PCM 区温度梯度有空穴较无空穴时显著得多,可能导致该处热应力过大,从而降低其使用寿命.

英文摘要：

Unit heat pipe receiver in advanced solar dynamic system is numerically simulated. With the proposed mathematical model and calculation method, numerical simulation results are compared with experimental data. The temperature field of PCM （phase change material） is calculated and thermal performance of heat pipe receiver is analyzed. Analysis results show that the axial and radial temperature difference of heat pipe are small; the thermal performance of heat pipe receiver is stable and reliable. The existence of void cavity has significant influence on phase change process, which leads to higher temperature gradient of PCM zone when void cavity presents.