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本文以典型槽式太阳集热器为研究对象,建立了集热管三维结构模型,通过有限元的方法对其进行热结构耦合分析,得到了不同工况下集热管管壁温度场、应力场的分布规律。结果表明,集热管在波纹管段与直管段的过渡区域,管壁温度和温度梯度最大,且集热管最大热应变和最大等效应力位于过渡区域。在此基础上,分析了不同工况下集热管的最大等效应力.当集热管内壁对流换热系数由200 W·m~(-2)·℃~(-1)减小到50 W·m~(-2)·℃~(-1)时,其管壁最大等效应力会迅速增大。此结论将为集热管的安全运行提供参考依据。
In this paper, a typical trough solar collector is taken as the research object, a three-dimensional structural model of the collector tube is established, and the thermal structural coupling analysis of the collector tube is carried out by the finite element method. The temperature field and the stress field of the collector tube wall under different conditions are obtained Distribution. The results show that the pipe wall temperature and temperature gradient are the largest in the transition area between the corrugated pipe section and the straight pipe section, and the maximum thermal strain and the maximum equivalent stress of the heat pipe lie in the transition area. On this basis, the maximum equivalent stress of the heat pipe under different operating conditions is analyzed. When the convective heat transfer coefficient decreases from 200 W · m -2 · ℃ -1 to 50 W · m ~ (-2) · ℃ -1, the maximum equivalent stress of the pipe wall will increase rapidly. This conclusion will provide a reference for the safe operation of the heat pipe.