On the nature of tip clearance flow in subsonic centrifugal impellers  

作　　者：LIU ZhengXian PING Yan ZANGENEH Mehrdad 

机构地区：[1]School of Mechanical Engineering, Tianjin University [2]State Key Laboratory of Engines, Tianjin University [3]Department of Mechanical Engineering, University College London

出　　处：《Science China(Technological Sciences)》2013年第9期2170-2177,共8页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51276125);the National Basic Research Program of China ("973" Project) (Grant No. 2012CB720101)

摘　　要：Increasing demand for downsizing of engines to improve CO2 emissions has resulted in renewed efforts to improve the efficiency and expend the stable operating range of the centrifugal compressors used in petro-chemical equipment and turbochargers. The losses in these compressors are dominated by tip clearance flow. In this paper, the tip clearance flow in the subsonic impeller is numerically investigated. The nature of the tip clearance in inducer, axial to radial bend and exducer are studied in detail at design and off-design conditions by examining the detailed flow field through the clearance and the interaction of the clearance flow with the shear effect with the endwalls. The correlation between blade loading and span wise geometry and clearance flow at different locations are presented.

关 键 词：centrifugal impeller tip clearance subsonic flow numerical simulation blade loading 

分 类 号：TH452[机械工程—机械制造及自动化] V231.3[航空宇航科学与技术—航空宇航推进理论与工程]