采用数值计算方法开展了肋壁与气膜耦合结构在考虑各向异性导热系数情况下的综合换热特性研究。对比分析了连续肋、光滑和间断肋冷却流通道在各向异性导热系数影响下综合冷却效率、毕渥数、气膜与肋壁的相互影响及二者分别对冷却的贡献。采用平板冷却模型,研究导热系数比为1、2、5条件下以及主导热方向沿X轴、Y轴和Z轴条件下三种模型的综合冷却特性。结果表明:主导热系数的增加对平均综合冷效影响不大但会使冷却分布更加均匀。主导热方向沿Z轴可使平均综合冷效提升5%~9%,沿X轴分布的平均综合冷效最小且冷却分布更为集中。肋壁的存在可以提高平均综合冷效,相较于光滑通道可提高2%~5%,且间断肋作用相较于连续肋更显著。主导热方向沿Z轴时气膜孔出口温度比另外两种情况高14~18K,这个温度会影响实际气膜冷却效率。主导热方向沿Z轴时肋面总效率相较于另外两种情况高约1.7%,总换热系数约为另外两种情况4.7倍。

Numerical calculations were carried out on the overall heat transfer characteristics of conjugate heat transfer and flow of rib and film cooling structures under anisotropic thermal conductivities. The overall cooling efficiencies, the Biwer number, and the interaction of the film cooling with the rib and the contribution of both to the cooling under the influence of anisotropic thermal conductivities for cooling channels of continuous-ribbed, smooth, and interrupted-ribbed were compared and analyzed. Different cooling channel models overall cooling characteristics were investigated under the conductivity ratios of 1, 2 and 5 and main thermal directions along the X, Y and Z axis for flat plane. The results show that: the increase of the conductivity ratios has little effect on the average cooling efficiencies but make the cooling distribution more uniform. The average overall cooling efficiencies of main thermal direction along the Z-axis is 5%-9% higher than any other case, the average overall cooling efficiency of main thermal direction along the X-axis is the lowest and the distribution of the cooling zone is more concentrated. The ribs can improve the average overall cooling efficiencies by 2% to 5% compared to smooth channels, and the interrupted ribs have better performance than continuous ribs. The outlet temperature of the film hole is 14-18 K higher in the main thermal direction along the Z-axis than any other case, and this temperature affects the actual film cooling efficiencies. The total efficiencies of the rib is about 1.7% higher when the main thermal direction is along the Z-axis compared to the other two cases and the total heat transfer coefficients is about 4.7 times higher than the other two cases.

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国家自然科学基金（52071107），中国博士后科学基金（2019M661254，2021T140147）