This paper describes an investigation into the effect that passing wakes have on a separation bubble that exists on the pressure surface and near the leading edge of a low-pressure turbine blade. Previous experimental studies have shown that the behavior of this separation is strongly incidence dependent and that it responds to its disturbance environment. The results presented in this paper examine the effect of wake passing in greater detail. Two-dimensional, Reynolds averaged, numerical predictions are first used to examine qualitatively the unsteady interaction between the wakes and the separation bubble. The separation is predicted to consist of spanwise vortices whose development is in phase with the wake passing. However, comparison with experiments shows that the numerical predictions exaggerate the coherence of these vortices and also overpredict the time-averaged length of the separation. Nonetheless, experiments strongly suggest that the predicted phase locking of the vortices in the separation onto the wake passing is physical.
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March 2004
Technical Papers
The Effect of Wake Passing on a Flow Separation in a Low-Pressure Turbine Cascade
Michael J. Brear,
Michael J. Brear
Department of Mechanical and Manufacturing Engineering, University of Melbourne, Australia
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Howard P. Hodson
Howard P. Hodson
Whittle Laboratory Engineering Department, Cambridge University, UK
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Michael J. Brear
Department of Mechanical and Manufacturing Engineering, University of Melbourne, Australia
Howard P. Hodson
Whittle Laboratory Engineering Department, Cambridge University, UK
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division March 4, 2003; revised manuscript received October 30, 2003. Associate Editor: W. W. Copenhaver.
J. Fluids Eng. Mar 2004, 126(2): 250-256 (7 pages)
Published Online: May 3, 2004
Article history
Received:
March 4, 2003
Revised:
October 30, 2003
Online:
May 3, 2004
Citation
Brear, M. J., and Hodson, H. P. (May 3, 2004). "The Effect of Wake Passing on a Flow Separation in a Low-Pressure Turbine Cascade ." ASME. J. Fluids Eng. March 2004; 126(2): 250–256. https://doi.org/10.1115/1.1667884
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