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Research Papers: Flows in Complex Systems

Numerical Simulation and Evaluation of Velocity Fluctuations During Rotating Stall of a Centrifugal Pump

[+] Author and Article Information
Andreas Lucius

Institute of Applied Mechanics,  Clausthal University of Technology, Clausthal-Zellerfeld, Germany 38678andreas.lucius@tu-clausthal.de

Gunther Brenner

Institute of Applied Mechanics,  Clausthal University of Technology, Clausthal-Zellerfeld, Germany 38678gunther.brenner@tu-clausthal.de

J. Fluids Eng 133(8), 081102 (Aug 16, 2011) (8 pages) doi:10.1115/1.4004636 History: Received October 18, 2010; Accepted May 27, 2011; Published August 16, 2011; Online August 16, 2011

Flow instabilities like rotating stall can lead to severe vibrations in turbomachines if the eigenfrequency of the rotor is equal to the stall frequency. The goal of the present work is to shed some light on the origin of the rotating stall phenomenon in a centrifugal pump. The resulting fluctuating loads are quantified using numerical computations. For the chosen configuration transient PIV data are available for validation. In addition to measuring the stall frequency in the stationary frame, the CFD data is analyzed in the rotating frame. A Fourier analysis is done for a large number of sample points. This enables us to determine the local variation of amplitudes for a given frequency. Together with eigenfrequencies and eigenmodes of the rotor determined from modal analysis, it is possible to evaluate the risk of resonance vibration excited from fluctuating fluid forces.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Problem setup; inlet domain, rotor blades, and outlet domain

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Figure 2

Mesh lines on blades and bottom disk, grid b

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Figure 3

Simulation results for 2D turbulent channel flow, Re = 80,000

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Figure 4

Deviation of CFD results from Dean’s correlation for 2D channel flow; different near wall grid spacing and Reynolds number

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Figure 5

Averaged spectrum of velocity in absolute coordinates, CFD versus measurements

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Figure 6

Vector plot of velocity, grid b, t = 14.5 s

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Figure 7

(a) Averaged spectrum and (b) and (c) spectrum at distinct specified locations

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Figure 8

Averaged radial distribution of velocity amplitudes, amplitudes scaled with u2

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Figure 9

Local distribution of velocity amplitudes at different frequencies

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Figure 10

Unsteady mean velocity for different imposed frequency of unsteadiness

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