Suppression of unstable flow at small flow rates in a centrifugal blower by controlling tip leakage flow and reverse flow

被引:18
作者
Ishida, M [1 ]
Surana, T [1 ]
Ueki, H [1 ]
Sakaguchi, D [1 ]
机构
[1] Nagasaki Univ, Grad Sch Sci & Technol, Dept Mech & Syst Engn, Nagasaki 8528521, Japan
来源
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME | 2005年 / 127卷 / 01期
关键词
D O I
10.1115/1.1811092
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The effects of the inlet recirculation arrangement on inducer stall and the diffuser width on diffuser stall in a high-specific-speed-type centrifugal impeller with inducer were analyzed by numerical simulation and also verified experimentally. It was found that the incipient unstable flow occurs due to a rolling-up vortex flow, resulting from an interaction between the tip leakage flow and the reverse flow accumulated at the pressure side immediately downstream of the inducer tip throat, in which a strong streamwise component of vorticity is included. By forming the inlet recirculation flow, the tip leakage vortex is effectively sacked into the suction ring groove, and the flow incidence is decreased simultaneously. The unstable flow range of the test blower was reduced significantly by about 45% without deteriorating the impeller characteristics by implementing optimally both the ring groove arrangement and the narrowed diffuser width.
引用
收藏
页码:76 / 83
页数:8
相关论文
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