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TECHNICAL PAPERS

The Flow Structure During Onset and Developed States of Rotating Stall Within a Vaned Diffuser of a Centrifugal Pump

[+] Author and Article Information
Manish Sinha, Ali Pinarbasi, Joseph Katz

Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218

J. Fluids Eng 123(3), 490-499 (Mar 15, 2001) (10 pages) doi:10.1115/1.1374213 History: Received October 27, 2000; Revised March 15, 2001
Copyright © 2001 by ASME
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References

Figures

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The pump geometry and location of the present measurements
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The optical and control systems
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The performance curve (squares) and output power (triangles) of the pump
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A typical pressure signal of transducer C at: (a) design conditions (φ=0.118), (b) stalled conditions (φ=0.062), (c) power spectra of the signals in 4(a) and 4(b), (d) auto spectrum of Channels A, B, E, and F
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(a) Sample cross spectrum magnitude of transducer signals in vane passages A and B; (b) phase difference between the signals of tranducers A and B
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RMS values of pressure fluctuations as a function of flow rate
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Sample Instantaneous velocity maps at: (a) minimum, (b) zero-crossing (on the rise), and (c) maximum phases of the low-pass-filtered pressure signal at passage C (φ=0.062)
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Phase averaged velocity maps at a minimum pressure phase when the blade is at: (a) −4 deg, (b) 26 deg, and (c) 56 deg. The colors indicate velocity magnitude and a reference vector is provided in Fig. 7. Only alternate vectors are shown for clarity.
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Phase averaged velocitiy maps at a minimum pressure phase when the blade is at: (a) −4 deg, (b) 26 deg, and (c) 56 deg. The colors indicate velocity magnitude and a reference vector is provided in Fig. 7. Only alternate vectors are shown for clarity.
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Sample (a) instantaneous; and (b) phase averaged velocity maps (only alternate vectors are shown in b) at a minimum pressure phase. The flow rate is 3.78 1/s (φ=0.078) and the blade orientation is 6 deg.
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Sample (a) instantaneous and (b) phase averaged velocity maps (only alternate vectors are shown in b) at a minimum pressure phase. The flow rate is 3.28 1/s (φ=0.068) and the blade orientation is 6 deg.
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Sample (a) instantaneous and (b) phase averaged velocity maps (only alternate vectors shown in b) at a minimum pressure phase. The flow rate is 3.08 1/s (φ=0.062) and the blade orientation is 6 deg.
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Sample (a) instantaneous and (b) phase averaged velocity maps (only alternate vectors are shown in b) at a minimum pressure phase. The flow rate is 2.52 1/s (φ=0.052) and the blade orientation is 6 deg.
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Sample instantaneous velocity distribution at a minimum pressure phase as massive flow separation and the onset of stall occur in passage D. The flow rate is 2.89 1/s (φ=0.060) and the blade orientation is 6 deg.

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