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周向非均匀高密度热流引发的过热问题一直影响着太阳能热发电站中高温吸热器的运行安全。该文建立了太阳能高温吸热管对流换热电加热实验台和数值计算模型,通过实验研究和模拟计算,研究了周向非均匀热流边界条件下吸热管壁温度分布规律。研究结果显示:周向非均匀热流边界条件下吸热管壁温度分布与截面圆心角余弦呈函数关系,实验测量结果与数值计算结果吻合较好;经典Dittus-Boelter公式仍可用于计算周向非均匀热流边界条件下吸热管内的换热计算,但不适用于管壁温度分布计算。文中给出了周向非均匀热流边界条件下吸热器管壁温度计算关联式。
The overheating problem caused by circumferentially non-uniform high density heat flow has always affected the operation safety of the high-temperature heat absorber in the solar thermal power station. In this paper, a convection heat transfer electric heating experimental bench and numerical calculation model of solar heat-absorbing heat pipe were established. Through experimental research and simulation calculation, the law of wall temperature distribution of heat-absorbing pipe under non-uniform circumferential heat flow boundary conditions was studied. The results show that the wall temperature distribution of the heat-absorbing pipe wall is functionally related to the central angle cosine of the cross-section, and the experimental results agree well with the numerical results. The classical Dittus-Boelter formula can still be used to calculate the circumferential non-uniform heat flow boundary conditions Under heat pipe heat exchanger calculation, but does not apply to the wall temperature distribution calculation. In this paper, the calculation formula of wall temperature of heat absorber under non-uniform heat flow boundary condition is given.