耦合交错肋的尾缘半劈缝非定常流动与冷却机理  

Unsteady Flow and Film Cooling Mechanism of Trailing Edge Cutback With Latticework Ducts

作　　者：贾乾坤 杜巍[1] 罗磊[1] 闫晗 JIA Qiankun;DU Wei;LUO Lei;YAN Han(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin,150001,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《工程热物理学报》2025年第2期451-459,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金青年科学基金项目(No.52106041);黑龙江省自然科学基金项目(No.LH2023E042)。

摘　　要：针对耦合交错肋通道的新型尾缘半劈缝模型,采用DES(Detached Eddy Simulation)方法,探究了五种吹风比时交错肋诱导的偏转旋流对尾缘半劈缝掺混区非定常流动特征和气膜冷却效率的影响机制。结果显示:随着吹风比增加,壁面冷却效率呈现波动峰谷式分布,M=1.25时面平均冷却效率达到0.646。较高吹风比时旋流冷气主导尾缘下游的冷热掺混过程,展向截面出现大尺度反肾型涡对。此外,旋流射流诱导了下游旋转纵向涡的生成,影响了壁面高冷效气膜的分布范围。In this study,a trailing edge cutback film cooling model with latticework ducts is proposed.The dynamic mechanisms of unsteady flow characteristics and film cooling efficiency of trailing edge cutback at five blowing ratios(M),which are controlled by the deflected swirling coolant induced by the latticework ducts,are investigated using the DES(Detached Eddy Simulation)method.The results show that the cooling efficiency exhibits a fluctuating peak-valley distribution as the blowing ratio increases.At M=1.25,the area-average cooling efficiency reaches 0.646.Under higher blowing ratios,the mixing process is dominated by swirling coolant downstream of the cutback.Large-scale counter-rotating vortex pairs are observed in the spanwise section.Additionally,the swirling jet induces the generation of rotating streamwise vortices,significantly affecting the distribution range of the film coverage on the wall.

关 键 词：涡轮叶片 尾缘半劈缝 交错肋 气膜冷却 旋流冷气 

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]