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TECHNICAL PAPERS

Suppression of Performance Curve Instability of a Mixed Flow Pump by Use of J-groove

[+] Author and Article Information
Sankar L. Saha

Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japane-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 122(3), 592-597 (Mar 27, 2000) (6 pages) doi:10.1115/1.1287855 History: Received May 18, 1999; Revised March 27, 2000
Copyright © 2000 by ASME
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References

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Figures

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Mixed flow pump tested (Ns=830)
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Location of J-groove on the casing wall, (a) Grooves formed on the surface of the casing wall, (b) grooves formed under the surface of the casing wall
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Comparison of performance curves. Uncertainties of ϕ, ψ, τ, and η are ±1.4 percent; ±0.7 percent; ±1.1 percent and ±2 percent, respectively
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Velocity distribution at the impeller inlet section. Uncertainties of Vm/U2;Vθ/U2 and z/b1 are ±3.3 percent; ±3.3 percent and ±2.2 percent, respectively. (a) Meridional velocity component, (b) tangential velocity component
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Comparison of pressure coefficient at the hill and bottom of J-groove. Uncertainties of Cp; ϕ and ψ are ±1 percent, ±1.4 percent and ±0.7 percent, respectively
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Effect of groove length on instability. Uncertainties of ϕ, ψ, τ, and η are ±1.4 percent; ±0.7 percent; ±1.1 percent and ±2 percent, respectively
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Effect of groove depth and width on instability. Uncertainties of ϕ, ψ, τ, and η are ±1.4 percent; ±0.7 percent; ±1.1 percent and ±2 percent, respectively
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Effect of groove number on instability. Uncertainties of ϕ, ψ, τ, and η are ±1.4 percent; ±0.7 percent; ±1.1 percent and ±2 percent, respectively
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Effect of groove location on instability. Uncertainties of ϕ, ψ, τ, and η are ±1.4 percent; ±0.7 percent; ±1.1 percent and ± 2 percent, respectively
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Wall pressure fluctuation. (a) 26 mm upstream of the impeller outlet tip, (b) 9.3 mm downstream of the impeller inlet tip
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Criteria of optimum J-groove dimension. Uncertainty of JE No. is ±6.6 percent

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