小叶片对大转角扩压叶栅出口流场的影响  

Influence of the Small Blades on the Flow Field at the Outlet of a Diffusion Cascade with a Large Turning Angle

作　　者：赛庆毅[1] 朱源嘉[1] 戴韧[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《热能动力工程》2014年第1期17-21,104,共5页Journal of Engineering for Thermal Energy and Power

基　　金：上海市重点学科建设项目(J50501);国家自然科学基金资助项目(51276116)

摘　　要：采用五孔探针分别测量了6～26°不同攻角下，大转角高扩压度叶栅及增加小叶片后叶栅的出1：2流场。结果表明：大小叶片叶栅中，小叶片改善了设计工况下叶栅内部流动，抑制了大叶片吸力面及端壁角区流动损失向叶栅中部的发展；在较大与较小攻角时，叶栅流动损失明显增加；大攻角时大小叶片叶栅出口中部区域速度场得到明显改善，其余工况通流能力变化不大；大小叶片叶栅在所有工况下，出口截面上气流转角整体平均约增加3～5°，表明气动负荷有一定提升．By utilizing a five-hole probe,measured respectively were the flow fields at the outlet of a high diffusion cascade with a large turning angle and a cascade with small blades being additionally installed at different attack angles from6 to 26 degrees. It has been found that in a cascade installed with small and large blades,the presence of the small ones can improve the inner flow inside the cascade under the design operating condition and other conditions nearing to it and restrain the development of the loss-caused areas on the suction surface of the large blades as well as the end and wall corner zones towards the middle of the cascade. When the attack angle is relatively big or small,the flow losses inside the cascade will increase obviously and when the attack angle is big,the flow speed field in the middle of the cascade at the outlet installed with small and large blades will be improved remarkably while the flow path capacity under other operating conditions will change little. The turning angle of the air flow of the cascade installed with small and large blades will increase by 3 to 5 degrees as an average in the section at the outlet,indicating that the aerodynamic load is enhanced to a certain degree.

关 键 词：小叶片 大转角 扩压叶栅 出口流场 测试研究 

分 类 号：TH432.1[机械工程—机械制造及自动化]