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RESEARCH PAPERS

The Role of Tip Clearance in High-Speed Fan Stall

[+] Author and Article Information
J. J. Adamczyk

NASA Lewis Research Center, Cleveland, OH 44135

M. L. Celestina

Sverdrup Technology, Inc., Lewis Research Center Group, Cleveland, OH 44135

E. M. Greitzer

Massachusetts Institute of Technology, Cambridge, MA 02139

J. Turbomach 115(1), 28-38 (Jan 01, 1993) (11 pages) doi:10.1115/1.2929212 History: Received February 19, 1991; Online June 09, 2008

Abstract

A numerical experiment has been carried out to define the near-stall casing endwall flow field of a high-speed fan rotor. The experiment used a simulation code incorporating a simple clearance model, whose calibration is presented. The results of the simulation show that the interaction of the tip leakage vortex and the in-passage shock plays a major role in determining the fan flow range. More specifically, the computations imply that it is the area increase of this vortex as it passes through the in-passage shock that is the source of the blockage associated with stall. In addition, for fans of this type, it is the clearance over the forward portion of the fan blade that controls the flow processes leading to stall.

Copyright © 1993 by The American Society of Mechanical Engineers
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