Effects of Squealer Geometry of Turbine Blade Tip on the Tip-Leakage Flow and Loss  

作　　者：ZENG Fei ZHANG Weihao WANG Yufan CAO Xia ZOU Zhengping 

机构地区：[1]National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,School of Energy&Power Engineering,Beihang University,Beijing 100191,China [2]Research Institute of Aero-Engine,Beihang University,Beijing 100191,China

出　　处：《Journal of Thermal Science》2021年第4期1376-1387,共12页热科学学报（英文版）

基　　金：support of the National Science Foundation of China(No.51406003);the National Science and Technology Major Project(J2019-II-0019-040)。

摘　　要：The effective control of the tip-leakage flow and loss is of great significance to improve the aerodynamic performance of the turbine.In this paper,the evolution mechanism of tip-leakage flow in a transonic high pressure turbine with a squealer tip is investigated with numerical simulation methods.The impacts of squealer geometric,such as the inclined pressure side rim and squealer rim width,on the vortex structure in the gap and tip-leakage loss are discussed.The results show that the scraping vortex inside the cavity plays the role of aero-labyrinth seal,and forms interlocking sealing labyrinth structure with the rims on both sides,which has an effective sealing effect on the tip-leakage flow.The inclined pressure side squealer rim inhibits the development of the pressure side squealer corner vortex,which is beneficial to expand the influence range of the scraping vortex and enhance the sealing effect on the tip-leakage flow.The increase of the suction side squealer rim width reduces the effective flow area at the gap exit,which is conducive to reduction of the tip-leakage flow rate and tip-leakage loss.However,the increase of the pressure side squealer rim width strengthens the pressure side squealer corner vortex and limits the development space of the scraping vortex,causing the adverse effects on the control of tip-leakage flow.

关 键 词：TURBINE squealer tip tip-leakage flow squealer width tip-leakage loss 

分 类 号：V263.6[航空宇航科学与技术—航空宇航制造工程]