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RESEARCH PAPERS

The Structure of Tip Clearance Flow in Axial Flow Compressors

[+] Author and Article Information
B. Lakshminarayana, M. Zaccaria, B. Marathe

The Pennsylvania State University, Department of Aerospace Engineering, University Park, PA 16802

J. Turbomach 117(3), 336-347 (Jul 01, 1995) (12 pages) doi:10.1115/1.2835667 History: Received October 01, 1993; Online January 29, 2008

Abstract

Detailed measurements of the flow field in the tip region of an axial flow compressor rotor were carried out using a rotating five-hole probe. The axial, tangential, and radial components of relative velocity, as well as the static and stagnation pressures, were obtained at two axial locations, one at the rotor trailing edge, the other downstream of the rotor. The measurements were taken up to about 26 percent of the blade span from the blade tip. The data are interpreted to understand the complex nature of the flow in the tip region, which involves the interaction of the tip leakage flow, the annulus wall boundary layer and the blade wake. The experimental data show that the leakage jet does not roll up into a vortex. The leakage jet exiting from the tip gap is of high velocity and mixes quickly with the mainstream, producing intense shearing and flow separation. There are substantial differences in the structure of tip clearance observed in cascades and rotors.

Copyright © 1995 by The American Society of Mechanical Engineers
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