Numerical Analysis of Three-Dimensional Unsteady Hot Streak Migration and Shock Interaction in a Turbine Stage

[+] Author and Article Information
A. P. Saxer, H. M. Felici

Turbomachinery Laboratory, Institute of Energy Technology, Swiss Federal Institute of Technology, Zürich, Switzerland

J. Turbomach 118(2), 268-277 (Apr 01, 1996) (10 pages) doi:10.1115/1.2836636 History: Received February 11, 1994; Online January 29, 2008


A three-dimensional unsteady flow computation has been performed for a transonic first turbine stage under the influence of streaks of hot gas exiting the combustion chamber. Realistic flow conditions are obtained by using an unequal stator-to-rotor pitch, a single-streak/multistator channel configuration, and periodic boundary conditions. The resulting unsteady shock wave system and the hot streak migration as well as the shock wave/streak interaction are presented and discussed. In addition, the time average of the periodic unsteady solution is analyzed and compared with a steady-state computation. The steady-state solution is analyzed and compared with a steady-state computation. The steady-state solution matches the time-averaged one in terms of the pressure field and the maximum stagnation temperature on the rotor blade surface. However, the rotor blade temperature patterns are different with a stronger radial secondary flow present in the time-averaged solution due to the retention of the circumferential streak variations at the stator/rotor interface.

Copyright © 1996 by The American Society of Mechanical Engineers
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