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TECHNICAL PAPERS

Passive Control of Rotating Stall in a Parallel-Wall Vaneless Diffuser by Radial Grooves

[+] Author and Article Information
Junichi Kurokawa

Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan e-mail: kuro@mach.me.ynu.ac.jp

Sankar L. Saha

Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan e-mail: saha@mach.me.ynu.ac.jp

Jun Matsui

Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan e-mail: jmat@post.me.ynu.ac.jp

Takaya Kitahora

Department of Mechanical Engineering, Shonan Institute of Technology, 1-1-25 Tujido-Nishikaigan, Fujisawa, Kanagawa, 251-8511, Japan e-mail: kitahora@mech.shonan-it.ac.jp

J. Fluids Eng 122(1), 90-96 (Dec 06, 1999) (7 pages) doi:10.1115/1.483230 History: Received May 17, 1999; Revised December 06, 1999
Copyright © 2000 by ASME
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References

Figures

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Vaneless diffuser test stand
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Pressure fluctuation measured at r/ri=1.10. Uncertainties of p/(0.5ρu22) and α are ±0.73 percent and ±4.6 percent, respectively.
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(a) Nondimensional amplitude. (b) Nondimensional frequency. Characteristics of wall pressure fluctuation of rotating stall in a large vaneless diffuser (r0/ri=4.78). Uncertainties of Δp/(0.5ρu22); α and Ω are ±1 percent; ±4.6 percent and 3.3 percent, respectively.
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Remarkable effect of radial grooves on suppressing rotating stall in the vaneless diffuser (grooves of 32n×3d×10w on upper wall). Uncertainty of p/(0.5ρu22) is ±0.73 percent.
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(a) Tangential velocity. (b) Radial velocity. Velocity distribution in the vaneless diffuser channel (r/ri=1.10,ϕ=0.162). Uncertainties of vθ/u2;vr/u2 and z/b are ±3.23 percent; ±3.23 percent and ±2.24 percent, respectively.
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(a) r/ri=1.10 (downstream of impeller exit). (b) r0/ri=4.78 (diffuser exit). Comparison of total pressure at the outlet of the impeller and the vaneless diffuser. Uncertainties of pT/(0.5ρu22) and ϕ are ±0.73 percent and ±1.17 percent, respectively.
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Flow in the groove at the impeller exit
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(a) r/ri=1.10. (b) r/ri=1.64. Change in tangential velocity ν̄θ and comparison of theory and measurements. Uncertainties of ν̄θ/u2 and ϕ are ±4 percent and ±1.17 percent, respectively.
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(a) r/ri=1.10. (b) r/ri=1.64. Change in α and comparison with measurements. Uncertainties of α and ϕ are ±4.6 percent and ±1.17 percent, respectively.
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Flow rate ratio of groove flow to main flow [r/ri=1.10]

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