考虑各向异性导热系数的肋壁-气膜冷却结构流热耦合研究  

Research on Conjugate Heat Transfer and Flow of Rib and Film Cooling Structures under Anisotropic Thermal Conductivities

作　　者：董良辰 姜玉廷[1] 张昊苏 陈辰霖 DONG Liangchen;JIANG Yuting;ZHANG Haosu;CHEN Chenlin(College of Power and Energy Engineering,Harbin Engineering University,Harbin,China,150001)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001

出　　处：《热能动力工程》2024年第9期13-22,共10页Journal of Engineering for Thermal Energy and Power

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

摘　　要：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的综合冷却效率、毕渥数以及气膜与肋壁的相互影响和二者分别对冷却效率的影响。采用平板冷却模型,研究导热系数比为1,2和5条件下以及主导热方向沿X轴、Y轴和Z轴条件下的综合冷却特性。结果表明:主导热系数的增加对平均综合冷却效率影响不大,但会使冷却分布更加均匀。主导热方向沿Z轴可使平均综合冷却效率提升5%~9%,沿X轴分布的平均综合冷却效率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却效率,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两种方向高14~18 K,会对实际气膜冷却效率产生影响;主导热方向沿Z轴时肋面总效率相较于另两种方向高约1.7%,总传热系数约为另两种方向的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 effect of both on the cooling under the influence of anisotropic thermal conductivities for cooling channels with continuous rib, smooth and interrupted rib were compared and analyzed. Overall cooling characteristics of different cooling channel models were investigated under the conductivity ratios of 1, 2 and 5 and main thermal conductivity directions along the X, Y and Z axes for flat plane. The results show that the increase of main thermal conductivity coefficients has little effect on the average overall cooling efficiency, but makes the cooling distribution more uniform. The average overall cooling efficiency under main thermal conductivity direction along the Z-axis is 5%-9% higher than any other case, the average overall cooling efficiency under main thermal conductivity 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 efficiency by 2% to 5% compared with smooth channels, and the interrupted ribs have better performance than continuous ribs. The outlet temperature of the film hole is 14-18 K higher under main thermal conductivity direction along the Z-axis than that under the other two directions, and this temperature affects the actual film cooling efficiencies. The total efficiency of the rib is about 1.7% higher under main thermal conductivity direction along the Z-axis compared to that under the other two directions and the total heat transfer coefficient is about 4.7 times higher than that under the other two directions.

关 键 词：各向异性导热系数 气膜冷却 肋壁通道 流热耦合 数值模拟 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]