中文摘要：

采用外敷保温层的螺旋盘管作为碟式太阳能集热器的腔式吸热器。利用CFD分析的方法得到了螺旋管腔式太阳能吸热器和内部流体的温度场分布及流体的速度场分布。通过插值的方法,将CFD分析中得到的螺旋管腔式吸热器模型中的网格节点温度场导入到热应力分析模型中的网格节点并作为热应力场分析的输入载荷。结果表明,在靠近吸热器保温层侧的流体流速比靠近吸热器内腔侧的流体流速高,靠近保温层侧的流体温度和壁面温度要低;在螺旋管腔式吸热器出口处,最大等效热应力出现在吸热器内腔侧的螺旋管内壁面处,切向应力对最大等效热应力影响最大。因此,要提高螺旋管吸热器的可靠性,应先设法降低螺旋管吸热器沿圆周方向的温度梯度。

英文摘要：

Spiral tube with insulation layer is adopted as the solar cavity type receiver for solar dish concentrating system.The temperature field and velocity field of solar cavity type receiver are obtained by CFD analysis.By interpolation method,the resulted temperature fields defined at the nodes of CFD analysis meshes are used as input loads for the thermal stress analysis.The numerical results show that the fluid velocity near the insulation layer side is higher than that near the cavity side.The maximum Von-Mises stress on the outlet section of cavity receiver locates on the inner wall of spiral tube near the cavity side.Compared to the radial and axial thermal stresses,the tangential thermal stress has higher impact on the Von-Mises stress.Therefore,in order to improve the reliability of solar cavity type receiver,the key is to reduce the temperature gradient along the circumferential direction.