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对一种具有U形子通道以及凹陷涡发生器的新型网格冷却结构内的流动和传热特性进行了实验和数值计算研究,通过数值计算可以较准确地获得网格冷却结构的传热性能和流阻性能.在数值计算模型得到验证的基础上,还分别对具有U形子通道和凹陷涡发生器的网格冷却结构,以及具有U形和矩形子通道的网格冷却结构内的流动和传热性能进行了对比研究.对比研究表明:与矩形子通道相比,U形子通道结构能够改善子通道底部的流动状况,降低流动阻力,但同时也略微降低了总体传热性能;在U形子通道壁面上布置凹陷涡发生器能够显著增强底部流动扰动,大幅提高传热性能,但同时也增加了流动阻力.
The flow and heat transfer characteristics of a novel grid cooling structure with U-shaped channel and concave vortex generator are studied experimentally and numerically. The heat transfer performance of grid cooling structure can be obtained by numerical calculation And flow resistance.According to the verification of the numerical calculation model, the flow field in the grid cooling structure with U-shaped channel and concave vortex generator and in the grid cooling structure with U-shaped and rectangular sub-channels Compared with the rectangular sub-channel, the U-shaped sub-channel structure can improve the flow of the bottom of the sub-channel and reduce the flow resistance, but also slightly reduce the overall heat transfer performance; Depressed vortex generators placed on the U-shaped sub-channel walls significantly enhance bottom flow disturbances, dramatically improve heat transfer but also increase flow resistance.