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TECHNICAL PAPERS

Experimental and Numerical Study of Unsteady Flow in a Diffuser Pump at Off-Design Conditions

[+] Author and Article Information
Hong Wang, Hiroshi Tsukamoto

Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata, Kitakyushu 804-8550, Japan

J. Fluids Eng 125(5), 767-778 (Oct 07, 2003) (12 pages) doi:10.1115/1.1603305 History: Received November 20, 2002; Revised April 22, 2003; Online October 07, 2003
Copyright © 2003 by ASME
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References

Figures

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Comparison of unsteady pressure in the frequency domain at stations (r1,c3) and (r3,c3); (a) Q̄/Q0=0.80 and (b) Q̄/Q0=0.45; the experimental uncertainties Q=±1.5%Cp=±0.9%
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Cross spectra at station (r1,c3) in DE and DD passage (see Fig. 2(b)); (a) Q̄/Q0=0.80 and (b) Q̄/Q0=0.45; the experimental uncertainties Q=±1.5%Cp=±0.9%
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Calculated unsteady pressure at station (r1,c3); (a) in time domain and (b) in frequency domain
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The Liapunov exponents of unsteady pressure at station (r1,c3)
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The Liapunov dimension of unsteady pressure at station (r1,c3)
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Test rig and instrumentation system
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Schematic configurations of test diffuser pump; (a) cross-sectional view of test pump, (b) impeller and diffuser, (c) leading edge of impeller vane
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Mathematical model for calculation
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Panel around solid boundary and nascent vortex elements
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Pump characteristics curve; (a) total pressure rise coefficient and pump efficiency and (b) standard deviation of total pressure rise, the experimental uncertainties ψ=±1.0%, ϕ=±1.6%, and η=±2.5%
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Variation in steady pressure versus flow rate at the inlet, mid, and exit of diffuser passage; the experimental uncertainties Q=±1.5%, and Cp=±0.9%
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Comparison of unsteady pressure in the time domain, (a) (r1,c1); (b) (r1,c3), the experimental uncertainties Cp=±0.9%
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Measured pressure fluctuations at station (r1,c1) in the frequency domain for the rated condition, the experimental uncertainties Sxx=±1.8%
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Calculated flow pattern at Nt=131/9 for Q̄/Q0≈0.86; (a) vortex pattern (b) velocity contour
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Calculated flow pattern at Nt=93/9 for Q̄/Q0≈0.83; (a) vortex pattern, (b) velocity contour in area D○
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Velocity contour at Nt=93/9 in area D○ for Q̄/Q0≈0.80
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Time histories of relative velocity at station E○
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Calculated flow pattern at low discharge range (Q̄/Q0=0.50); (a) circulation change around each diffuser vane, (b) velocity contour at Nt=6, (c) velocity contour at Nt=11, (d) velocity contour at Nt=16
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Unsteady pressure at station (r1,c3) in the frequency domain; (a) Q̄/Q0=0.35, 0.30, 0.25, 0.20, 0.10, 0.05, (b) Q̄/Q0=0.60, 0.55, 0.50, 0.45, 0.40, (c) Q̄/Q0=0.85, 0.83, 0.80, 0.78, 0.75, and (d) Q̄/Q0=1.20, 1.10, 1.00, 0.90, 0.70, 0.65; the experimental uncertainties Q=±1.5%,Cp=±0.9%

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