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Experiments in Fluids
Published in: Experiments in Fluids 4/2011

01-04-2011 | Research Article

Measurements of the tip leakage vortex structures and turbulence in the meridional plane of an axial water-jet pump

Authors: Huixuan Wu, Rinaldo L. Miorini, Joseph Katz

Published in: Experiments in Fluids | Issue 4/2011

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Abstract

Particle image velocimetry (PIV) measurements at varying resolutions focus on the flow structures in the tip region of a water-jet pump rotor, including the tip-clearance flow and the rollup process of a tip leakage vortex (TLV). Unobstructed views of these regions are facilitated by matching the optical refractive index of the transparent pump with that of the fluid. High-magnification data reveal the flow non-uniformities and associated turbulence within the tip gap. Instantaneous data and statistics of spatial distributions and strength of vortices in the rotor passage reveal that the leakage flow emerges as a wall jet with a shear layer containing a train of vortex filaments extending from the tip of the blade. These vortices are entrained into the TLV, but do not have time to merge. TLV breakdown in the aft part of the blade passage further fragments these structures, increasing their number and reducing their size. Analogy is made between the circumferential development of the TLV in the blade passage and that of the starting jet vortex ring rollup. Subject to several assumptions, these flows display similar trends, including conditions for TLV separation from the shear layer feeding vorticity into it.
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Metadata
Title
Measurements of the tip leakage vortex structures and turbulence in the meridional plane of an axial water-jet pump
Authors
Huixuan Wu
Rinaldo L. Miorini
Joseph Katz
Publication date
01-04-2011
Publisher
Springer-Verlag
Published in
Experiments in Fluids / Issue 4/2011
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-010-0975-0

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