摘要
采用非定常流场数值模拟的方法,分析了某整体涡轮叶盘的转子叶片叶尖间隙对涡轮气动效率的影响。从叶尖泄漏流引入的潜流与漏气角度出发,研究了潜流、漏气以及两者耦合作用的气流损失机理,分析叶尖间隙对涡轮效率的影响,结果表明,潜流损失是由边界层流动转变引起;漏气损失是直接参与做功的气流减少的原因;潜流与漏气的耦合作用是一种二次流损失。使用湍动能量化叶尖泄漏流的总损失,结果表明叶尖间隙泄漏流不仅影响叶尖处的流场,也影响叶中和叶根处的流场;随着叶尖间隙的增大,湍动能强度与高湍动能区域面积不断增大,表明泄漏损失增大,涡轮效率降低。
Using numerical simulation of unsteady flow fields,the impact of rotor blade tip clearance on turbine efficiency was analyzed for an integral turbine disk.From the perspective of the underflow and leakage introduced by tip leakage flow,the mechanisms of airflow losses due to underflow,leakage,and their coupled effects were studied.It is found that underflow losses are caused by the transition of boundary layer flow,leakage losses result from the reduction of airflow directly involved in work,and the coupling of underflow and leakage constitutes a secondary flow loss.By quantifying the total loss of tip leakage using turbulent kinetic energy,it was indicated that tip leakage flow not only affects the flow field at the blade tip but also influences the flow fields at the blade midsection and root.As the tip clearance increases,the turbulent kinetic energy intensifies and the area of high turbulent kinetic energy regions expands,suggesting an increase in leakage losses and a corresponding decrease in turbine efficiency.
作者
朱郁涵
孙雨杰
张润泽
康磊
陆学伟
谢巍屹
熊湘杰
刘长利
ZHU Yuhan;SUN Yujie;ZHANG Runze;KANG Lei;LU Xuewei;XIE Weiyi;XIONG Xiangjie;LIU Changli(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《华东理工大学学报(自然科学版)》
北大核心
2025年第5期704-712,共9页
Journal of East China University of Science and Technology
基金
国家自然科学基金(52075176)。
关键词
非定常流动
叶尖间隙
气动性能
流场分析
气动效率
unsteady flow
tip clearance
aerodynamic performance
flow field analysis
aerodynamic efficiency
