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基于雷诺时均的三维定常粘性N-S方程及能量方程,对内设挡流板的太阳能平板空气集热器内部流动和传热特性进行数值分析和实验验证,模拟结果与实验测量结果显示出良好的一致性。研究表明:挡流板的存在致使内部流动非常复杂,挡流板背侧发生显著的流动分离与再附着现象,同时对温度场产生重要影响,因此消除各种涡流是提高集热效率的有效途径之一;气流在挡流板末端发生180°偏转形成的二次流增加了流动损失,但同时实现了冷热流体的掺混,强化了换热;集热板的多种换热方式中对流换热占主导,辐射换热占总换热量的1/7,为提高集热效率,应设法进一步降低集热板平均温度。
Based on the three-dimensional steady viscous Navier-Stokes equations and energy equation of Reynolds averaged time, the numerical simulation and experimental verification of the internal flow and heat transfer characteristics of a solar panel air collector with a baffle are carried out. The simulation results and experimental measurements show good consistency. The results show that the internal flow of the baffle is very complicated, the flow separation and reattachment occur on the back of the baffle, and the temperature field has an important influence. Therefore, the elimination of various vortices is an effective way to improve the heat collecting efficiency One; the flow of the deflector at the end of 180 ° deflected the formation of the secondary flow increases the flow loss, but at the same time to achieve the mixing of hot and cold fluids, and strengthen the heat exchange; heat exchanger plate a variety of heat exchange mode convection Heat dominated radiation heat transfer accounted for the total heat exchange 1/7, in order to improve the heat collection efficiency, should try to further reduce the average collector temperature.