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TECHNICAL PAPERS

Numerical Study of Pressure Fluctuations Caused by Impeller-Diffuser Interaction in a Diffuser Pump Stage

[+] Author and Article Information
F. Shi

Satellite Venture Business Lab.

H. Tsukamoto

Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology Kitakyushu-shi, 804-8550, Japan

J. Fluids Eng 123(3), 466-474 (Apr 12, 2001) (9 pages) doi:10.1115/1.1385835 History: Received October 21, 1998; Revised April 12, 2001
Copyright © 2001 by ASME
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References

Figures

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Schematics of test diffuser pump. (a) Test diffuser pump; (b) pressure measurement stations for test vaned diffuser; (c) shifted static pressure tap position in blade-to-blade passage
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Computational grid. (a) 2-D computational grid (41,800 cells); (b) 3-D computational grid (338,460 csells)
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Convergence history of time accurate computation during five rotations. (a) velocity fluctuation; (b) pressure fluctuation
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Effect of time step on pressure fluctuation at station (r1,c1) for rated condition
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Effect of grid density on pressure fluctuation at station (r1,c1) for rated condition
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Time histories of unsteady pressure Δψ at (r1,c1); Experimental Uncertainty in Δψ=7.1 percent
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Unsteady pressure Δψ at (r1,c1) predicted by Singularity method accounting for the viscous effects
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Contour map of magnitude of Δψp-p of pressure fluctuation in vaned diffuser passage at rated condition; experimental uncertainty in Δψp-p=7.1 percent. (a) Measured; (b) calculated by singularity method; (c) CFD predicted
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Pressure fluctuation at (r1,c1) in frequency domain
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2-D CFD predicted static pressure at two instants. (a) t*=0.0; (b) t*=0.41378
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Unsteady pressure Δψ at position (r1,c3) for rated condition
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2-D CFD predicted turbulent kinetic energy at two instants. (a) t*=0.0; (b) t*=0.13788
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2-D CFD predicted contour of vorticity at two instants. (a) t*=0.41378; (b) t*=0.72418
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Comparisons between 2-D and 3-D calculations. (a) (r1,c1); (b) (r1,c3); (c) (r2,c3); (d) (r3,c3)
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Contours of relative velocity at the impeller discharge based on unsteady 3-D calculation. (a) t*=0.0; (b) t*=0.7758
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Static pressure contour at the impeller discharge based on unsteady 3-D calculation. (a) t*=0.0; (b) t*=0.7758

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