Instantaneous flow topology and the associated endwall heat transfer in the leading-edge endwall region of a symmetric airfoil are presented. An experimental technique was employed that allowed the simultaneous recording of instantaneous particle image velocimetry flow field and thermochromic liquid-crystal-based endwall heat transfer data. The endwall flow is dominated by a horseshoe vortex that forms from reorganized impinging boundary layer vorticity. A relatively small vortex is shown to be a steady feature of the corner region, while a secondary vortex develops sporadically immediately upstream of the horseshoe vortex. The region upstream of the horseshoe vortex is characterized by a bimodal switching of the near-wall reverse flow, which results in quasiperiodic eruptions of the secondary vortex. The bimodal switching of the reverse flow in the vicinity of the secondary vortex is linked to the temporal behavior of the down-wash fluid on the leading edge of the foil. Frequency analysis of the flow field and endwall heat transfer data, taken together, indicate that the eruptive behavior associated with the horseshoe vortex occurs at a frequency that is essentially the same as the measured turbulence bursting period of the impinging turbulent endwall boundary layer.
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October 2006
Technical Papers
The Dynamics of the Horseshoe Vortex and Associated Endwall Heat Transfer—Part I: Temporal Behavior
T. J. Praisner,
T. J. Praisner
Turbine Aerodynamics,
United Technologies Pratt and Whitney
, 400 Main Street, S/S 169-29, East Hartford, CT 06108
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C. R. Smith
C. R. Smith
Department of Mechanical Engineering,
Lehigh University
, 19 Memorial Drive West, Bethlehem, PA 18015
Search for other works by this author on:
T. J. Praisner
Turbine Aerodynamics,
United Technologies Pratt and Whitney
, 400 Main Street, S/S 169-29, East Hartford, CT 06108
C. R. Smith
Department of Mechanical Engineering,
Lehigh University
, 19 Memorial Drive West, Bethlehem, PA 18015J. Turbomach. Oct 2006, 128(4): 747-754 (8 pages)
Published Online: February 1, 2005
Article history
Received:
October 1, 2004
Revised:
February 1, 2005
Connected Content
A companion article has been published:
The Dynamics of the Horseshoe Vortex and Associated Endwall Heat Transfer—Part II: Time-Mean Results
Citation
Praisner, T. J., and Smith, C. R. (February 1, 2005). "The Dynamics of the Horseshoe Vortex and Associated Endwall Heat Transfer—Part I: Temporal Behavior." ASME. J. Turbomach. October 2006; 128(4): 747–754. https://doi.org/10.1115/1.2185676
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