涡轮叶片冷却通道高性能微小肋湍流传热的数值研究  

Numerical Study on Turbulent Heat Transfer of Miniature Ribs in Turbine Blade Internal Passage

作　　者：李彦霖 饶宇[1] 王德强 LI Yan-Lin;RAO Yu;WANG De-Qiang(Institute of Turbomachinery,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院,叶轮机械研究所,上海200240

出　　处：《工程热物理学报》2018年第10期2271-2279,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51176111)

摘　　要：为了提高涡轮叶片内冷通道的换热性能,针对分别带有直肋、斜肋、V肋和W肋这四种微小结构肋的冷却通道进行了数值计算并。通道宽高比为6,肋间距与肋高比为10,肋高与水力直径比为0.029。采用低雷诺数AKN k-ε模型研究了雷诺数范围从36700到60000时四种带肋通道的换热与流动特性并与实验结果相比较,发现通道换热性能和压力损失与稳态实验结果较一致。研究表明,W肋换热性能最优,其平均努塞尔数是流动充分发展的光滑通道的2.2到2.4倍,摩擦因子是光滑通道的3.7～4.0倍。其次是V肋、直肋,斜肋最低。分析流场发现直肋下游回流区最大,壁面努塞尔数在横向上较均匀,而斜肋、V肋和W肋因为二次流的存在回流区较小,壁面努塞尔数沿着肋展方向降低。To enhance the heat transfer in the internal channel of the turbine blade, steady numerical simulations were conducted for four channels on which transverse ribs, angled ribs, V ribs and W ribs were placed respectively. The aspect ratio of the channel was 6, the rib pitch to height ratio was 10 and the rib height to mean hydraulic diameter ratio was 0.029. A low-Reynolds-number κ- ε model （AKN） was adopted to simulate the heat transfer and flow field in the four ribbed channels with Reynolds number ranging from 36700 to 60000. It is found that the heat transfer and pressure loss from the calculation corresponded to the experimental results. W ribs show the best heat transfer performance. The average Nusselt numbers and friction factors of W ribs are 2.2-2.4 of smooth channel. V ribs take the second place followed by transverse ribs, and the angled ribs show the worst heat transfer performance. The flow field shows that the recirculation zone of transverse ribs is the biggest, but the others show smaller recirculation zones. While the local Nusselt number distribution on the heating wall between transverse ribs is relatively uniform in the spanwise direction, the Nusselt numbers on the heating wall of other ribs decreases due to the secondary flOW.

关 键 词：涡轮叶片冷却 微小结构肋 传热 摩擦因子 

分 类 号：TK121[动力工程及工程热物理—工程热物理]