Suppression of Unstable Flow at Small Flow Rates in a Centrifugal Blower by Controlling Tip Leakage Flow and Reverse Flow
Suppression of Unstable Flow at Small Flow Rates in a Centrifugal Blower by Controlling Tip Leakage Flow and Reverse Flow
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DOI：
10.1115/1.1811092
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发表时间：
2004
影响因子：
1.7
通讯作者：
M. Ishida;Taufan Surana;H. Ueki;D. Sakaguchi
中科院分区：
文献类型：
--
作者：
M. Ishida;Taufan Surana;H. Ueki;D. Sakaguchi
采用数值模拟和实验验证的方法，分析了进口再循环布置方式对导流器失速的影响以及扩压器宽度对导流器失速的影响。研究发现，初始不稳定流动的发生是由于旋涡上升引起的，旋涡上升是由叶尖泄漏流动和积聚在诱导叶尖喉道下游压力侧的逆流相互作用引起的，其中包含了强的顺流涡度分量。通过形成进口再循环流动，将叶尖泄漏涡有效地吸入吸入环槽，同时减小了气流入射。通过优化环槽布置和扩压器宽度，在不影响叶轮特性的情况下，试验风机的不稳定流动范围显著减小了45%左右。
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 sucked 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.