槽缝射流对高负荷涡轮非轴对称端壁冷却性能的影响研究  

Effects of Slot Jet Flow on Non-Axisymmetric Endwall Cooling Performance in a High-Load Turbine

作　　者：杜昆 贾毅豪 赵尊盛 周淳 宋辉[1] 刘存良[1,3,4] DU Kun;JIA Yi-hao;ZHAO Zun-sheng;ZHOU Chun;SONG Hui;LIU Cun-liang(School of Power and Energy,Northwestern Polytechnical University,Xi’an 710129,China;Yangtze River Delta Research Institute,Northwestern Polytechnical University,Taicang 215400,China;Shaanxi Key Laboratory of Aeronautical Power System Thermal Science,Northwestern Polytechnical University,Xi’an 710129,China;NPU-KAI International Joint Laboratory of Advanced Aero-Engine Thermal Structure,Northwestern Polytechnical University,Xi’an 710129,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China)

机构地区：[1]西北工业大学动力与能源学院,陕西西安710129 [2]西北工业大学太仓长三角研究院,江苏太仓215400 [3]西北工业大学陕西省航空动力系统热科学重点实验室,陕西西安710129 [4]西北工业大学西北工业大学-喀山国立技术大学先进航空发动机热结构国际联合实验室,陕西西安710129 [5]中国航发湖南动力机械研究所,湖南株洲412002

出　　处：《推进技术》2023年第7期186-197,共12页Journal of Propulsion Technology

基　　金：国家自然科学基金(52006178);国家科技重大专项(Y2019-VIII-0007-0168);中央高校基本科研业务费专项资金(3102018zy019,3102020OMS701);陕西省创新能力支撑计划(2023-CX-TD-19)。

摘　　要：基于端壁静压分布造型方法,本文针对带有槽缝射流的高负荷涡轮,分别研究了全局及局部造型下端壁冷却性能的变化规律,揭示了不同入射角及槽缝结构对非轴对称造型端壁冷却性能的影响机理。研究表明:非轴对称端壁造型可以显著改变静叶端区气冷特性。造型端壁可通过抑制二次流强度,降低叶栅总压损失系数达0.364%;相比常规端壁,造型端壁冷气有效覆盖面积最大增大13.57%,但横向平均气膜有效度降低;造型端壁可以改善大倾角槽缝射流的冷却效果;使用相切圆弧的槽缝入射段结构后,造型端壁较平端壁有效冷却面积增大了11.51%。Based on endwall static pressure distribution contouring method,the difference of cooling perfor⁃mance about global and local non-axisymmetric endwall contouring was studied in this research for a high load turbine with purge flow.The effects of incidence angles and slot structures on endwall cooling characteristics of non-axisymmetric contouring were also revealed.The results show that the non-axisymmetric endwall contouring can alter the aerodynamic and cooling performance simultaneously.By inhibiting the secondary flow,the non-axi⁃symmetric endwall contouring can reduce the total cascade pressure loss coefficient 0.364%.The effective area covered by the coolant can increase by 13.57%compared to a flat endwall,but the laterally averaged film effec⁃tiveness is decreased.The non-axisymmetric endwall contouring could improve the protection effect of large angle purge flow.Under the work of tangent circle slot structure,coolant coverage area increases by 11.51%compared with flat endwall.

关 键 词：高负荷涡轮 非轴对称端壁 槽缝射流 气膜冷却 气动特性 总压损失 

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]