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 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. [S0098-2202(00)02901-1]
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March 2000
Technical Papers
Passive Control of Rotating Stall in a Parallel-Wall Vaneless Diffuser by Radial Grooves
Junichi Kurokawa, Professor,
Junichi Kurokawa, Professor
Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
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Sankar L. Saha, Ph.D Student,,
Sankar L. Saha, Ph.D Student,
Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
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Jun Matsui, Associate Professor,,
Jun Matsui, Associate Professor,
Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
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Takaya Kitahora, Associate Professor,
Takaya Kitahora, Associate Professor,
Department of Mechanical Engineering, Shonan Institute of Technology, 1-1-25 Tujido-Nishikaigan, Fujisawa, Kanagawa, 251-8511, Japan
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Junichi Kurokawa, Professor
Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
Sankar L. Saha, Ph.D Student,
Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
Jun Matsui, Associate Professor,
Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
Takaya Kitahora, Associate Professor,
Department of Mechanical Engineering, Shonan Institute of Technology, 1-1-25 Tujido-Nishikaigan, Fujisawa, Kanagawa, 251-8511, Japan
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division May 17, 1999; revised manuscript received December 6, 1999. Associate Technical Editor: D. R. Williams.
J. Fluids Eng. Mar 2000, 122(1): 90-96 (7 pages)
Published Online: December 6, 1999
Article history
Received:
May 17, 1999
Revised:
December 6, 1999
Citation
Kurokawa, J., Saha, S. L., Matsui, J., and Kitahora, T. (December 6, 1999). "Passive Control of Rotating Stall in a Parallel-Wall Vaneless Diffuser by Radial Grooves ." ASME. J. Fluids Eng. March 2000; 122(1): 90–96. https://doi.org/10.1115/1.483230
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