螺旋盘管腔式太阳能吸热器的热力耦合特性

Thermal-Mechanical Coupling Analysis of Spiral Tube in Solar Cavity Receiver

螺旋盘管腔式吸热器在塔式和碟式太阳能热利用中都有广泛的应用。聚集热流的非均匀性导致吸热器内产生温度梯度,从而在管内产生热应力,导致吸热管变形,而当温度梯度足够大时,热应力会导致吸热管破坏,严重影响吸热器的寿命。本文以四种气体工质为传热介质,基于CFD分析得到气体在吸热器中的管内流动情况及管壁的温度场分布,再将管壁得到的温度场直接加载到热应力分析模型中得到螺旋管的热应力分布。

The spiral tube has been wildly used as receivers in solar thermal power plant which turn solar radiation into electricity. Since the concentrated heat flux so high and non-uniform, the temperature gradient of the receiver will also be large, that high thermal stress will generate in the spiral tube, and when the thermal stress is high enough, the tube will be destroyed, and the solar receiver will also be destroyed immediately. In this study four kinds of gases had been used as transfer fluid. Firstly, CFD analysis was employed to obtain the fluid and temperature field, and then we used the temperature flied obtained to compute the thermal stress field of the spiral tube in heat receiver.