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Self-Induced Flow in a Stepped Rotating Tube PUBLIC ACCESS

[+] Author Affiliations
S. Gilham

W S Atkins Eng. Sciences Ltd., Epsom, Surrey, UK

P. C. Ivey

Cranfield Institute of Technology, Cranfield, Beds, UK

J. M. Owen

University of Bath, Bath, UK

Paper No. 91-GT-276, pp. V001T01A088; 9 pages
doi:10.1115/91-GT-276
From:
  • ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 1: Turbomachinery
  • Orlando, Florida, USA, June 3–6, 1991
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7898-9
  • Copyright © 1991 by ASME

abstract

Self-induced flow occurs when a tube, open at one end and sealed at the other, is rotated about its central axis: fluid flows along the axis from the open end towards the sealed end and returns in a layer adjacent to the inner surface of the tube. This mechanism, which can occur under isothermal or nonisothermal conditions, is believed to be responsible for the so-called “hot-poker effect” that was observed during anti-icing tests on the nose bullet of an aeroengine.

This paper describes a combined theoretical and experimental study of self-induced flow. It is shown that, for the length-to-diameter (L/D) ratios and rotational Reynolds numbers associated with the anti-icing tubes of aeroengines, the laminar flow near the sealed end of the tube is similar to that of the so-called free disc. Swirl in the air outside the open end reduces the self-induced flow, but flow can reach the sealed end of a stepped tube which has either a sudden contraction or a sudden enlargement.

Copyright © 1991 by ASME
Topics: Flow (Dynamics)
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