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Experimental investigation of the flow in the vaneless diffuser of a centrifugal pump by particle image displacement velocimetry

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Abstract

This work presents the application of particle image displacement velocimetry to the measurement of fluid velocities in a centrifugal pump diffuser. Measurements are taken at different operating points and allow to define the variation of radial and tangential velocity components along a pitch. They are further processed to determine the relative velocity and vorticity fields. Results are also compared with laser Doppler measurements taken in the same facility.

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Abbreviations

M :

scaling factor

d :

laser beam diameter

Δt :

time interval between light pulses

T :

time duration of each light pulse

l :

distance

W :

relative velocity vector

V :

absolute velocity vector

ω :

impeller angular speed

i, j :

unit vectors of the x-y axes

Ω :

vorticity

u :

x velocity component

v :

y velocity component

σ :

slip factor

U :

speed of the rotating reference frame

β :

blade angle

z :

number of blades

i :

image

r :

real

T :

tangential

R :

radial

References

  • Dean, R. C. (1972): Advanced radial compressors. VKI lecture series 50

  • Gauthier, V.; Moraitis, C. S.; Riethmuller, M. L. (1987): An automated processing system for PIDV. Paper presented at the LDA specialists meeting, Institut Franco-Allemand de Recherches de St. Louis, France

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  • Lourenco, L. M. (1986): Theory and applications of particle image displacement velocimetry. VKI lecture series 1986–09 (Flow visualization and digital image processing)

  • Sideris, M. Th.; Van den Braembussche, R. A. (1986): Influence of a circumferential pressure distortion on the flow in an impeller and diffuser. Paper presented at the ASME gas turbine conference, Düsseldorf, FRG. ASME pap. 86-GT-09

  • Traupel, W. (1962): Thermische Turbomaschinen, vol. 1. Berlin, Heidelberg, New York: Springer

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Author notes

  1. N. Paone

    Present address: Centro Ricerche FIAT, I-10043, Orbassano, Italy

Authors and Affiliations

  1. Von Karman Institute for Fluid Dynamics, B-1640, Rhode Saint Genèse, Belgium

    N. Paone, M. L. Riethmuller & R. A. Van den Braembussche

Authors
  1. N. Paone
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  2. M. L. Riethmuller
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  3. R. A. Van den Braembussche
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Paone, N., Riethmuller, M.L. & Van den Braembussche, R.A. Experimental investigation of the flow in the vaneless diffuser of a centrifugal pump by particle image displacement velocimetry. Experiments in Fluids 7, 371–378 (1989). https://doi.org/10.1007/BF00193417

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  • DOI: https://doi.org/10.1007/BF00193417

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