球底蜂窝组合叶顶对涡轮叶尖泄漏流动的控制  

Control of Tip Clearance Flow of Turbine Cascade With Spherical-Bottom Honeycomb Tip

作　　者：付云峰[1] 孟睿 俞建阳[1] 陈浮[1] 宋彦萍[1] FU Yun-Feng;MENG Rui;YU Jian-Yang;CHEN Fu;SONG Yan-Ping(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》2018年第11期2382-2388,共7页Journal of Engineering Thermophysics

摘　　要：本文提出一种新型球底蜂窝组合叶顶结构,数值研究了其对涡轮叶栅叶顶间隙流场的影响,并探讨了底部球形结构相对几何深度对泄漏流动的影响规律。结果表明:蜂窝腔内形成旋涡改变间隙流场结构,球底蜂窝组合结构加强了该类旋涡,对泄漏流动具有更好的抑制效果;与平顶叶栅相比,蜂窝叶顶和球底蜂窝组合叶顶叶栅泄漏量分别减小了11.18%和15.13%,损失降低了8.17%和10.42%;另外,间隙泄漏量和损失均随球底蜂窝组合结构的球底几何深度呈抛物线变化,球底深度为1/6球径时,叶栅具有最小的泄漏量和损失。In this paper, the influence of a new spherical-bottom honeycomb tip structure on the leakage flow of turbine cascade is numerically studied. The influence of the depth of the bottom on the leakage flow is also investigated. The results show that vortices change the structure of the flow field in the honeycomb cavity, and the composite structure with the spherical-bottom honeycomb reinforces this type of vortex, which has a better suppression effect on the leakage flow. Compared with the conventional flat tip, the leakage flow of the cascades with honeycomb tip and spherical-bottomed honeycomb tip decreased by 11.18% and 15.13%, and the exit losses decreased by 8.17% and 10.42% respectively. For the spherical-bottom honeycomb tip cascade, both the amount of leakage flow and the loss change parabolically with the geometric depth of the spherical bottom. At the ball depth of 1/6 of the ball diameter, minimum leakage flow and exit loss can be got.

关 键 词：涡轮叶栅 间隙泄漏流动 蜂窝叶顶 球底蜂窝组合叶顶 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]