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RESEARCH PAPERS

Self-Induced Flow in a Stepped Rotating Tube

[+] Author and Article Information
S. Gilham

W. S. Atkins Engineering Sciences Ltd., Surrey, KT18 5BW, United Kingdom

P. C. Ivey

School of Mechanical Engineering, Cranfield Institute of Technology, Cranfield, Beds, MK43 0AL, United Kingdom

J. M. Owen

School of Mechanical Engineering, University of Bath, Bath, BA2 7AY, United Kingdom

J. Eng. Gas Turbines Power 114(2), 268-274 (Apr 01, 1992) (7 pages) doi:10.1115/1.2906583 History: Received March 04, 1991; Online April 24, 2008

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 toward 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 disk. Swirl in the air outside the open end reduces the self-induced flow, but flow can reach the sealed end of a stepped tube that has either a sudden contraction or a sudden enlargement.

Copyright © 1992 by The American Society of Mechanical Engineers
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