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针对以往对气体冲击射流的研究主要是大孔径和高雷诺数的状况,本文主要研究微小孔径和中低雷诺数空气冲击射流的换热特性,采用数值模拟方法对空气冲击冷却的流动和传热过程进行了三维数值研究。特别研究了在不同孔径、冲击距离及射流入口雷诺数对冲击表面冷却流动传热特性的影响规律,并拟合了一定条件下换热板的平均Nu的换热关联式。结果表明,在研究范围内,射流雷诺数越大,冲击靶面换热效果越好,在一定条件下,存在最佳孔径和最佳冲击距离。
In this paper, the research on the gas jet impinging mainly on the condition of large aperture and high Reynolds number, this paper mainly studies the heat transfer characteristics of air impact jet with small aperture and low Reynolds number. The numerical simulation is used to simulate the flow and heat transfer of air impingement cooling The process of three-dimensional numerical study. In particular, the influences of different pore sizes, impact distance and Reynolds number of jet inlet on the heat transfer characteristics of the cooling surface were investigated. The heat transfer correlations of the average Nu of the heat exchange plate under certain conditions were fitted. The results show that the larger the Reynolds number of the jet, the better the heat transfer effect on the target surface. Under certain conditions, there exists the optimal aperture and the optimum impact distance.