离散气膜孔对涡轮端壁气膜冷却特性的影响  

Effect of Discrete Film holes on Film Cooling Characteristic of a Turbine Endwall

作　　者：张杰 刘存良[1] 牛夕莹 叶林 张丽[1] ZHANG Jie;LIU Cunliang;NIU Xiying;YE Lin;ZHANG Li(School of Power and Energy,Northwestern Polytechnical University,Xi’an 710072,China;Harbin Marine Boiler and Turbine Research Institute,Harbin 150078,China)

机构地区：[1]西北工业大学动力与能源学院,西安710072 [2]哈尔滨船舶锅炉与涡轮机研究所,哈尔滨150078

出　　处：《工程热物理学报》2024年第11期3331-3337,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.U2241268,No.U2241251);国家重大科技专项(No.J2019-III-0019-0063)。

摘　　要：本文采用压敏漆(PSP)技术研究了质量流量比、密度比以及泄漏流对具有离散气膜孔布局端壁的气膜冷却特性的影响。研究结果发现,离散气膜孔质量流量比(R_(mf1))对端壁上游区域的气膜冷效分布有较大的影响,特别是压力侧附近区域。随着密度比(R_(d))的增大,在端壁上游区域的气膜冷效逐渐提升,但是通道涡的强度沿着主流流向逐渐增大,这降低了密度比对端壁下游区域气膜冷却的影响。此外,泄漏流极大地提升了端壁的面平均气膜冷却效率,特别是当R_(mf1)为1.75%时,面平均冷效提高了77.8%。In this paper,the effects of mass flow ratio,density ratio and leakage flow on the film cooling characteristic of the turbine endwall with a discrete film hole layout were studied using the pressure sensitive paint(PSP)technology.The results show that the mass flow ratio of the discrete film holes(R_(mf1))has a great influence on the distribution of film cooling effectiveness in the upstream region of the endwall,especially the area near the pressure side.As the density ratio(R_(d))increases,the film cooling effectiveness in the upstream region of the endwall is gradually improved,however,the effect of the R_(d)on the film cooling in the downstream region of the endwall is reduced due to the intensity of the passage vortex quickly increases along the mainflow direction.In addition,the leakage flow greatly improves the average surface film cooling effectiveness of the endwall,particularly when R_(mf1)=1.75%,the average surface cooling effectiveness is increased by 77.8%.

关 键 词：涡轮端壁 气膜冷效 离散气膜孔 泄漏流 压敏漆技术 

分 类 号：TK123[动力工程及工程热物理—工程热物理]