气膜孔内部对流换热的数值研究

Numerical simulation of convective heat transfer inside film cooling hole

运用数值计算方法对气膜孔内的对流换热特性进行了研究,分析了气膜孔内雷诺数（Re=10 00050 000）、气膜孔倾角（α=20°40°）及长径比（l/d=46）对气膜孔内部表面传热系数的影响规律.在研究参数范围内,结果表明：①气膜孔内表面传热系数随着雷诺数的增大而增强;②增大孔倾角,气膜孔进口附近的表面传热系数有较大幅度的提高;③气膜孔内周向平均表面传热系数沿程呈单调下降的趋势,在小长径比下气膜孔内总体平均表面传热系数较高.

The convective heat transfer characteristics inside film cooling hole were investigated numerically.The effects of Reynolds number,film cooling hole angle and length-diameter ratio on the heat transfer inside the film cooling hole were analyzed.Results show that：（1） The convective heat transfer coefficients are enhanced with increasing Reynolds number.（2） Increasing the hole angle enhances the convective heat transfer near the entrance to a film cooling hole.（3） The circumference average heat transfer coefficient decreases monotonously along film hole length,the total average convective heat transfer coefficient inside the film cooling hole is higher under small length-diameter ratio.