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.
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June 2001
Technical Papers
Flow Control of Rotating Stall in a Radial Vaneless Diffuser
Hiromu Tsurusaki, Professor,
Hiromu Tsurusaki, Professor
Department of Mechanical Engineering, Fukuyama University, Fukuyama, Hiroshima 729-0292 Japan
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Takahiro Kinoshita, Former Graduate Student
Takahiro Kinoshita, Former Graduate Student
Department of Mechanical Engineering, Fukuyama University, Fukuyama, Hiroshima 729-0292 Japan
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Hiromu Tsurusaki, Professor
Department of Mechanical Engineering, Fukuyama University, Fukuyama, Hiroshima 729-0292 Japan
Takahiro Kinoshita, Former Graduate Student
Department of Mechanical Engineering, Fukuyama University, Fukuyama, Hiroshima 729-0292 Japan
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division September 21, 1999; revised manuscript received December 1, 2000. Associate Editor: D. Williams.
J. Fluids Eng. Jun 2001, 123(2): 281-286 (6 pages)
Published Online: December 1, 2000
Article history
Received:
September 21, 1999
Revised:
December 1, 2000
Citation
Tsurusaki, H., and Kinoshita, T. (December 1, 2000). "Flow Control of Rotating Stall in a Radial Vaneless Diffuser ." ASME. J. Fluids Eng. June 2001; 123(2): 281–286. https://doi.org/10.1115/1.1351174
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