汇聚太阳能流体流速对吸热器温度场和应力场影响

Effects of Fluid Velocity on Temperature and Thermal Stress Field of Tube Receiver under Concentrated Solar Irradiation

为研究高汇聚太阳能流体流速对管式吸热器的温度场、热应变及热应力场的影响,本文采用蒙特卡洛与有限单元相结合的光热力顺序解耦计算法分析了不同流速下管式吸热器的温度场、热应变及热应力场的分布。计算结果表明管式吸热器的温度场、热应变及等效热应力均随着流体流速的增加而降低。与轴向热应力和径向热应力相比,切向热应力对管式吸热器的等效热应力的贡献比例更大,均匀化温度沿管式吸热器的圆周方向分布是热应力抑制的有效手段之一。

The ray thermal structural sequential coupled field analysis method was established by Monte Carlo ray tracing and finite element combined method. The effects of fluid velocity on temperature field,thermal stress field and total strain field of solar tube receiver were investigated by the ray thermal structural sequential coupled field analysis method. The temperature distribution,total strain filed and thermal stress field of different fluid velocity conditions were obtained by the ray thermal structural sequential coupled field analysis method. The numerical simulation results indicated that the value total strain and thermal stress decreased with the increasing of fluid velocity. Compared with the axial thermal stress and radial thermal stress,the tangential thermal stress was a major contribution to the maximum effective stress.An effective way of thermal stress refrain is to decrease the temperature gradient along the circumferential direction of solar tube receiver.