Unsteady and three-dimensional flow phenomena in a transonic centrifugal compressor impeller at rotating stall
Unsteady and three-dimensional flow phenomena in a transonic centrifugal compressor impeller at rotating stall
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DOI：
10.1115/gt2009-59516
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Kenichiro Iwakiri;M. Furukawa;S. Ibaraki;I. Tomita
中科院分区：
文献类型：
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作者：
Kenichiro Iwakiri;M. Furukawa;S. Ibaraki;I. Tomita
本文对汽车涡轮增压器跨音速离心压气机叶轮的旋转失速进行了实验和数值分析。压气机的失速特性是由两个高响应压力传感器安装在靠近叶轮进口的机匣壁上来检测的。利用小波变换对压力波形进行分析，定量估计扰动波。采用分离涡模拟（DES）耦合LES-RANS方法，对三维非定常内流场进行了数值模拟。分析结果表明，压气机的性能特性与旋转失速时的非定常流动特性吻合较好。在失速初期，全叶尖泄漏涡在某些通道出现螺旋型破裂，破裂区域逆叶轮旋转方向传播。这种现象随着节流的改变而改变，在发展失速状态下，全叶片前缘分离引起的龙卷风型分离涡主导了流场。该模型与轴流压气机转子短尺度旋转失速流动模型相似。Copyright © 2009 by ASME
This paper presents a combined experimental and numerical analysis of rotating stall in a transonic centrifugal compressor impeller for automotive turbochargers. Stall characteristics of the compressor were examined by two high-response pressure transducers mounted on the casing wall near the impeller inlet. The pressure traces were analyzed by wavelet transforms to estimate the disturbance waves quantitatively. Three-dimensional unsteady internal flow fields were simulated numerically by Detached Eddy Simulation (DES) coupled LES-RANS approach. The analysis results show good agreements on both compressor performance characteristics and the unsteady flow features at the rotating stall. At stall inception, spiral-type breakdown of the full-blade tip leakage vortex was found out at some passages and the brokendown regions propagated against the impeller rotation. This phenomenon changed with throttling, and tornado-type separation vortex caused by the full-blade leading edge separation dominated the flow field at developed stall condition. It is similar to the flow model of short-length scale rotating stall established in an axial compressor rotor.Copyright © 2009 by ASME