The Dynamics of the Horseshoe Vortex and Associated Endwall Heat Transfer—Part II: Time-Mean Results

[+] Author and Article Information
T. J. Praisner

Turbine Aerodynamics,  United Technologies Pratt and Whitney, 400 Main Street, N∕S 169-29, East Hartford, CT 06108

C. R. Smith

Department of Mechanical Engineering,  Lehigh University, 19 Memorial Drive West, Bethlehem, PA 18015

J. Turbomach 128(4), 755-762 (Feb 01, 2005) (8 pages) doi:10.1115/1.2185677 History: Received October 01, 2004; Revised February 01, 2005

Time-mean endwall heat transfer and flow-field data in the endwall region are presented for a turbulent juncture flow formed with a symmetric bluff body. The experimental technique employed allowed the simultaneous recording of instantaneous particle image velocimetry flow field data, and thermochromic liquid-crystal-based endwall heat transfer data. The time-mean flow field on the symmetry plane is characterized by the presence of primary (horseshoe), secondary, tertiary, and corner vortices. On the symmetry plane the time-mean horseshoe vortex displays a bimodal vorticity distribution and a stable-focus streamline topology indicative of vortex stretching. Off the symmetry plane, the horseshoe vortex grows in scale, and ultimately experiences a bursting, or breakdown, upon experiencing an adverse pressure gradient. The time-mean endwall heat transfer is dominated by two bands of high heat transfer, which circumscribe the leading edge of the bluff body. The band of highest heat transfer occurs in the corner region of the juncture, reflecting a 350% increase over the impinging turbulent boundary layer. A secondary high heat-transfer band develops upstream of the primary band, reflecting a 250% heat transfer increase, and is characterized by high levels of fluctuating heat load. The mean upstream position of the horseshoe vortex is coincident with a region of relatively low heat transfer that separates the two bands of high heat transfer.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Experimental setup illustrating the configuration employed to record simultaneous flow-field and endwall heat transfer data

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Figure 2

Time-mean symmetry-plane Stanton number distributions illustrating the effects of bluff body heating on endwall heat transfer

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Figure 3

Time-mean symmetry-plane vorticity and streamline topologies deduced from PIV data. Select u-velocity profiles are also shown.

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Figure 4

Time-mean vorticity for the four flow-field measurement planes adjacent to the bluff body

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Figure 5

Time-mean vorticity and streamline topologies for the 90deg+0.5D measurement plane. Vorticity levels are the same as those shown in Fig. 4.

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Figure 6

Time-mean (a) and RMS (b) endwall heat transfer distributions in the form of Stanton number

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Figure 7

Spatially aligned flow-field and endwall heat transfer data on the symmetry plane

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Figure 8

Construct of time-mean vorticity and endwall heat transfer data. Image is to scale.




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