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为了研究真实发动机尺寸下带有长圆形扰流柱阵列射流冲击结构的换热特性,选取雷诺数Re范围为1000~10000,并保证与真实发动机工况相同的克努森数Kn条件下,进行了实验研究。扰流柱排布方式分为顺排和叉排,冲击孔径D=0.4mm,0.5mm,0.6mm,冲击距H/D=1,1.5,2,详细分析了几何参数对结构整体平均对流换热系数的影响。结果表明:扰流柱的排布方式对平均换热系数影响很小,原因在于长圆形扰流柱的导流作用强于扰流作用;相同雷诺数时,孔径减小,流量减小33%,换热系数最大下降幅度10%,小孔结构具有保持相同换热强度、减小流量的应用潜力;相同雷诺数时,换热系数随着冲击距的减小而增大。
In order to study the heat transfer characteristics of an impingement structure with an elliptical array of long circular spoilers under a real engine size, Reynolds number Re range of 1000 to 10000 is selected and Knudsen number Kn is guaranteed under the same conditions as the real engine. An experimental study was carried out. The arrangement of the spoiler is divided into the row and the row of fork, the impact of the aperture D = 0.4mm, 0.5mm, 0.6mm, the impact of H / D = 1,1.5,2 detailed analysis of the geometric parameters of the overall structure of the average convection Effect of thermal coefficient. The results show that the arrangement of the spoiler has little effect on the average heat transfer coefficient, because the diversion effect of the oval-shaped spoiler is stronger than that of the spoiler. When the same Reynolds number is used, the aperture decreases and the flow decreases by 33%. %, The largest decrease of heat transfer coefficient of 10%, the pore structure has the same heat transfer intensity, reducing the potential application of flow; the same Reynolds number, the heat transfer coefficient increases with decreasing impact distance.