不同空穴位置下固液相变换热过程的差别

高温蓄热技术是空间太阳能热动力发电系统的关键技术之一。固液相变潜热蓄热是通常采用的蓄热方式。大多数盐类相变材料由液态转变为固态时体积会收缩，在其容器内形成空穴。空穴的存在增大了热阻，从而影响相变换热过程。通过数值模拟计算，分析了两种不同的空穴位置下固液相变换热过程的差别。

DIFFERENCES OF SOLID LIQUID PHASE CHANGE HEAT TRANSFER PROCESS BETWEEN DIFFERENT VOID POSITIONS

The technique of high temperature thermal storage is one of the critical techniques of a solar dynamic power system. Solid liquid phase change latent thermal storage is commonly used. The volume of most salts will contract while changing from liquid to solid, which leads to the forming of void in the container. The void enlarges heat resistance, and then affects the phase change heat transfer process. The differences of solid liquid phase change heat transfer process between two different void positions are analyzed through numerical simulation.