Passive Control of Rotating Stall in a Parallel-Wall Vaneless Diffuser by Radial Grooves
Passive Control of Rotating Stall in a Parallel-Wall Vaneless Diffuser by Radial Grooves
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DOI：
10.1115/1.483230
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发表时间：
2000-03
影响因子：
2
通讯作者：
J. Kurokawa;S. Saha;J. Matsui;T. Kitahora
中科院分区：
文献类型：
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作者：
J. Kurokawa;S. Saha;J. Matsui;T. Kitahora
为了控制和抑制离心式涡轮机扩压器内的旋转失速，提出了一种利用径向浅槽的被动控制方法，并对其效果进行了理论和实验研究。结果表明，在无叶扩压器的整个流动范围内，在一个壁面上开3mm深的径向槽或在两个壁面上开1mm深的径向槽都能抑制旋转失速。理论研究表明，径向槽的这种显著效果是由两种机制引起的：一种是由于主流和槽流之间的混合而使扩压器入口处的切向速度显著降低，另一种是由于槽逆流而使径向速度显著增加。这两种效应对增大流动角的贡献是相同的
In order to control and suppress rotating stall in the diffuser of a centrifugal turbomachine, a passive method of utilizing radial shallow grooves is proposed and its effect is s studied theoretically and experimentally. The results show that radial grooves of 3 mm depth on one wall or of only 1 mm depth on both walls can suppress rotating stall in a vaneless diffuser for the entire flow range. Theoretical considerations have revealed that this remarkable effect of radial grooves is caused by two mechanisms; one is a significant decrease in tangential velocity at the diffuser inlet due to mixing between the main flow and the groove flow, and the other is a remarkable increase in radial velocity due to the groove reverse flow. Both effects have the same contribution to increase the flow angle