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Flow Field Investigation in a Low Solidity Inducer by Laser Doppler Velocimeter PUBLIC ACCESS

[+] Author Affiliations
A. Boccazzi, U. Tabacco

C.N.P.M.-CNR, Centra di Ricerca sulla Propulsione e l’Energetica, Peschiera Borromeo, Italy

A. Perdichizzi

Universita’ di Brescia, Brescia, Italy

Paper No. 89-GT-54, pp. V001T01A027; 9 pages
doi:10.1115/89-GT-54
From:
  • ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Toronto, Ontario, Canada, June 4–8, 1989
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7913-9
  • Copyright © 1989 by ASME

abstract

The results of an experimental investigation of the flow-field within a low solidity inducer at design and off design flow rate are presented and discussed; particular attention is devoted to the analysis of the flow-field, at the tip in front of the leading edge, for the flow rate close to the back-flow onset.

The flow-field was measured by means of a laser doppler velocimeter at four different axial positions: upstream, within and downstream of the inducer. Axial, tangential and relative flow angle distributions, in the measuring planes, are presented for three different flow coefficients.

At the lower flow rate, the plots show the presence of reverse flow in the region close to the hub downstream of the trailing edge. For the same flow rate, quite low axial velocities are detected at the tip. This is in agreement with pressure probe traverses carried out in a slightly downstream section; these measurements also show radial inward velocities of the same order of magnitude as the axial velocities.

Circumferentially averaged losses were evaluated from specific work and total head rise given by pressure probes.

Copyright © 1989 by ASME
This article is only available in the PDF format.

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