Recent Advances in Simulating Unsteady Flow Phenomena Brought About by Passage of Shock Waves in a Linear Turbine Cascade

[+] Author and Article Information
J. C. Collie, H. L. Moses, J. A. Schetz

Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0238

B. A. Gregory

Turbine Aero & Cooling Technology, General Electric Aircraft Engines, Cincinnati, OH 45249

J. Turbomach 115(4), 687-698 (Oct 01, 1993) (12 pages) doi:10.1115/1.2929303 History: Received January 13, 1992; Online June 09, 2008


High-pressure-ratio turbines have flows dominated by shock structures that pass downstream into the next blade row in an unsteady fashion. Recent numerical results have indicated that these unsteady shocks may significantly affect the aerodynamic and mechanical performance of turbine blading. High cost and limited accessibility of turbine rotating equipment severely restrict the quantitative evaluation of the unsteady flowfield in that environment. Recently published results of the Virginia Tech transonic cascade facility indicate high integrity in simulation of the steady-state flow phenomena. The facility has recently been modified to study the unsteady effects of passing shock waves. Shock waves are generated by a shotgun blast upstream of the blade row. Shadowgraph photos and high-response pressure data are compared to previously published experimental and numerically predicted results. Plots are included that indicate large fluctuations in estimated blade lift and cascade loss.

Copyright © 1993 by The American Society of Mechanical Engineers
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