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为了研究加入二次倾斜冲击后双层壁隔热屏内通道的流动特征和换热分布,通过数值模拟研究了不同冲击距离和不同中间孔直径下,冲击雷诺数在2500~7500,气膜板内壁面的换热系数分布特征。结果显示:冲击距离越短,高换热区域面积越大,平均换热系数越高;冲击距离对气膜孔所在环腔内的二次冲击和旋流之间的相互作用影响较大;中间孔直径越小,平均换热系数越高,气膜孔所在的环腔内二次冲击范围越小,漩涡冲击范围越大。
In order to study the flow characteristics and heat transfer distribution of the double-walled heat shield after adding secondary inclined impact, the impact Reynolds number is 2500 ~ 7500 at different impact distances and different middle hole diameters by numerical simulation. Inner wall surface heat transfer coefficient distribution characteristics. The results show that the shorter the impact distance is, the larger the area of high heat exchange is, and the higher the average heat transfer coefficient is, the impact distance has a greater influence on the interaction between the secondary impact and the swirl flow in the annular cavity where the film hole is located. The smaller the pore diameter is, the higher the average heat transfer coefficient is. The smaller the secondary impact zone is, the larger the impact range is.