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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。
Spiral coil with external insulation layer as dish-type solar collector cavity-type heat sink. The distribution of temperature field and velocity distribution of fluid in spiral-tube solar heat absorber and internal fluid are obtained by CFD analysis. By interpolation, the grid node temperature field in the spiral cavity heat sink model obtained in CFD analysis is imported into the grid node in the thermal stress analysis model and used as the input load for thermal stress field analysis. The results show that the fluid velocity near the thermal insulation layer is higher than the fluid velocity close to the cavity side of the absorber, and the fluid temperature near the thermal insulation layer is lower than the wall temperature. , The maximum equivalent thermal stress appears on the inner wall of the spiral tube on the cavity side of the heat absorber, and the tangential stress has the greatest effect on the maximum equivalent thermal stress. Therefore, to improve the reliability of the coil heat sink, we should first try to reduce the helical tube heat sink along the circumferential direction of the temperature gradient.