Abstract The thermal stress plays an important role to assess the security of the solar receiver and is mainly affected by the temperature gradient. To study the thermal stress of the receiver, a MATLAB program was developed to study the distribution of temperature and thermal stress numerically, and the program was verified on the lab-scale receiver and it was found that the error between the calculated result and the experimental result did not exceed 10%. Then the in-house code was applied to a 600 MWth receiver to study its thermal performance and thermal stress numerically. The three-dimensional temperature and thermal stress distribution of the 600 MWth receiver were present in this work, and the maximum temperature of the tube and the maximum stress appeared in the last and first panel respectively. It was also found that the outlet temperature of the receiver obtained by the code was 574 °C, very close to the designed temperature 565 °C. The component stresses in tangential, radial and axial direction were analyzed, and the thermal stress in the tangential direction and the axial direction both had a transition from compressive stress to tensile stress along the radial direction, and thermal stress in the radial direction can be almost negligible. Besides, the thermal stress of the receiver in one day was studied, and the average thermal stress and the thermal stress ratio R were respectively 145 MPa and 1.843, and the maximum thermal stress of the receiver decreased 45.74% from 12:00 to 18:00 on the vernal equinox.

中文翻译：

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600 MWth太阳能圆柱外置接收器的热性能和热应力分析

摘要 热应力是评价太阳能接收器安全性的重要因素，主要受温度梯度的影响。为研究接收器的热应力，开发了MATLAB程序对温度和热应力的分布进行数值研究，并在实验室规模的接收器上对该程序进行了验证，发现计算结果与实验结果存在误差。结果不超过10%。然后将内部代码应用于 600 MWth 接收器，以数值研究其热性能和热应力。600 MWth 接收器的三维温度和热应力分布在这项工作中存在，管子的最高温度和最大应力分别出现在最后一个和第一块面板上。还发现通过代码获得的接收器出口温度为574℃，非常接近设计温度565℃。分析了切向、径向和轴向的分应力，切向和轴向的热应力均沿径向由压应力向拉应力过渡，径向热应力几乎可以达到微不足道。此外，研究了接收器一天的热应力，平均热应力和热应力比R分别为145 MPa和1.843，接收器最大热应力在12:00至18时下降了45.74%： 00 在春分。分析了切向、径向和轴向的分应力，切向和轴向的热应力均沿径向由压应力向拉应力过渡，径向热应力几乎可以达到微不足道。此外，研究了接收器一天的热应力，平均热应力和热应力比R分别为145 MPa和1.843，接收器最大热应力在12:00至18时下降了45.74%： 00 在春分。分析了切向、径向和轴向的分应力，切向和轴向的热应力均沿径向由压应力向拉应力过渡，径向热应力几乎可以达到微不足道。此外，研究了接收器一天的热应力，平均热应力和热应力比R分别为145 MPa和1.843，接收器最大热应力在12:00至18时下降了45.74%： 00 在春分。径向的热应力几乎可以忽略不计。此外，研究了接收器一天的热应力，平均热应力和热应力比R分别为145 MPa和1.843，接收器最大热应力在12:00至18时下降了45.74%： 00 在春分。径向的热应力几乎可以忽略不计。此外，研究了接收器一天的热应力，平均热应力和热应力比R分别为145 MPa和1.843，接收器最大热应力在12:00至18时下降了45.74%： 00 在春分。