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TECHNICAL PAPERS

Passive Control of Rotating Stall in a Parallel-Wall Vaned Diffuser by J-Grooves

[+] Author and Article Information
Sankar L. Saha

Graduate School of Engineeringe-mail: saha@mach.me.ynu.ac.jp

Junichi Kurokawa, Jun Matsui, Hiroshi Imamura

Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

J. Fluids Eng 123(3), 507-515 (Apr 27, 2000) (9 pages) doi:10.1115/1.1374214 History: Received April 27, 2000; Received March 01, 2001
Copyright © 2001 by ASME
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References

Figures

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Details of the test section
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(a) Configuration of diffuser and vane; (b) configuration of diffuser, vane and J-groove; (c) layout of the semiconductor pressure transducer and Pitot probe
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(a) Characteristic curve of the vaneless diffuser (ro/ri=2.5). Uncertainties of ψ & ϕ are ±1.5 percent and ±1.7 percent, respectively. (b) Velocity distribution at r/ri=1.10 in the vaneless diffuser. Uncertainties of Vθ/U2;Vr/U2;α&z/b are ±3.23 percent; ±3.23 percent; ±1.5 percent and ±2.24 percent, respectively.
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Characteristics of vaneless, vaned diffuser and rotating stalled flow range. Uncertainties of ψ & ϕ are ±1.5 percent and ±1.17 percent, respectively. (a) for different vane setting angles; (b) for different vane setting locations.
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Rotating stall frequency in vaneless and vaned diffuser. Uncertainty of ϕ is ±1.17 percent. (a) For different vane setting angles; (b) for different vane setting locations.
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Suppression of rotating stall by the J-groove. Uncertainties of ψ & ϕ are ±1.5 percent and ±1.17 percent, respectively. (a) Effect of number; (b) Effect of depth of J-groove; (c) Effect of width of J-groove; (d) Effect of length of J-groove
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Velocity distribution for vaned, vane and J-groove at r/ri=1.10. Uncertainties of Vθ/U2;Vr/U2;α&z/b are ±3.23 percent; ±3.23 percent; ±1.5 percent and ±2.24 percent, respectively. (a) Velocity distribution (vaned diffuser); (b) velocity distribution (vane and J-groove)
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(a) Pressure fluctuation in the vaned diffuser. Uncertainty of p/0.5ρU22 is ±0.73 percent. (b) Suppression of pressure fluctuation by J-groove. Uncertainty of p/0.5ρU22 is ±0.73 percent. (c) Suppression of rotating stall for the entire flow range. Uncertainties of ψ & ϕ are ±1.5 percent and ±1.17 percent, respectively.
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Suppression of peak-to-peak pressure fluctuation by J-groove. Uncertainties of (pmax−pmin)/0.5ρU22&ϕ are ±1.0 percent and ±1.17 percent, respectively.
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Criteria of optimum J-groove dimension. Uncertainties of stalled flow range [percent] & JE No. are ±1.65 percent and ±6.63 percent, respectively. (a) Without considering length of the J-groove; (b) considering length of the J-groove

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