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RESEARCH PAPERS

Mach Number Effects on Secondary Flow Development Downstream of a Turbine Cascade

[+] Author and Article Information
A. Perdichizzi

Department of Mechanical Engineering, University of Brescia, Brescia, Italy

J. Turbomach 112(4), 643-651 (Oct 01, 1990) (9 pages) doi:10.1115/1.2927705 History: Received January 01, 1989; Online June 09, 2008

Abstract

The results of an investigation of the three-dimensional flow downstream of a transonic turbine cascade are presented. The investigation was carried out for a wide range of Mach numbers, extending from M2is = 0.2 up to 1.55. Measurements were made in five planes at different axial locations downstream of the trailing edge (covering more than one chord length), by using a miniaturized five-hole probe especially designed for transonic flows. The results are presented in terms of local loss coefficient, vorticity, and secondary velocity plots; these plots give a detailed picture of the secondary flow development downstream of the cascade and show how flow compressibility influences the vortex configuration. As Mach number increases, the passage vortex is found to migrate toward the endwall and secondary flow effects are more confined in the endwall region. The pitchwise mass averaged loss and flow angle distributions along the blade height appear to be affected by the expansion ratio; at high Mach number both underturning and overturning angles are found to be smaller than in low velocity flows. Overall losses, vorticity, and secondary kinetic energy versus Mach number are also presented and discussed.

Copyright © 1990 by The American Society of Mechanical Engineers
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