Flow Control of Rotating Stall in a Radial Vaneless Diffuser
Flow Control of Rotating Stall in a Radial Vaneless Diffuser
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DOI：
10.1115/1.1351174
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发表时间：
2001-06
影响因子：
2
通讯作者：
Hiromu Tsurusaki;T. Kinoshita
中科院分区：
文献类型：
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作者：
Hiromu Tsurusaki;T. Kinoshita
理论上已经证明，扩压器壁面回流层的不稳定性和带涡的主流的不稳定性是导致无叶扩压器发生旋转失速的原因。然而，这些不稳定性尚未被实验证明存在。本研究系以扩散段内之喷流来探讨造成旋转失速发生之因素。旋转失速完全抑制的射流是在相反的方向上设置的叶轮圆周速度的矢量，并放大的射流设置在相同的方向作为该矢量。通过将射流安装在扩散器壁附近以外的位置的实验，证实了射流的效果。结果表明，主流的不稳定性有助于旋转失速的发生。讨论了引起旋转失速的因素以及射流对叶轮-扩压器组合体性能的影响
The instabilities of a backflow layer on a diffuser wall and the main flow with vorticity have already been shown theoretically to cause the occurrence of rotating stall in a vaneless diffuser. These instabilities, however, have not yet been proven to exist experimentally. This study was carried out to examine the factors contributing to the occurrence of rotating stall using a jet installed in a diffuser. Rotating stall was completely suppressed by a jet that was set in the direction opposite to the vector of the impeller peripheral velocity, and amplified by the jet set in the same direction as that vector. The effects of the jets were confirmed by the experiment using the jets installed at positions other than the neighborhood of the diffuser wall. The results suggest that the instability of the main flow contributes to the onset of rotating stall. The factors contributing to the onset of rotating stall and the effect of the jet on the performance of the impeller-diffuser combination are discussed