Comparison of Steady and Unsteady Secondary Flows in a Turbine Stator Cascade

[+] Author and Article Information
G. J. Hebert, W. G. Tiederman

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Turbomach 112(4), 625-632 (Oct 01, 1990) (8 pages) doi:10.1115/1.2927703 History: Received January 17, 1989; Online June 09, 2008


The effect of periodic rotor wakes on the secondary flow structure in a turbine stator cascade was investigated. A mechanism simulated the wakes shed from rotor blades by passing cylindrical rods across the inlet to a linear cascade installed in a recirculating water flow loop. Velocity measurements showed a passage vortex, similar to that seen in steady flow, during the time associated with undisturbed fluid. However, as the rotor wake passed through the blade row, a large crossflow toward the suction surface was observed in the midspan region. This caused the development of two large areas of circulation between the midspan and endwall regions, significantly distorting and weakening the passage vortices.

Copyright © 1990 by The American Society of Mechanical Engineers
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