High free-stream turbulence along a gas turbine airfoil and strong secondary flows along the endwall have both been reported to increase convective heat transfer significantly. This study superimposes high free-stream turbulence on the naturally occurring secondary flow vortices to determine the effects on the flowfield and the endwall convective heat transfer. Measured flowfield and heat transfer data were compared between low free-stream turbulence levels (0.6 percent) and combustor simulated turbulence levels (19.5 percent) that were generated using an active grid. These experiments were conducted using a scaled-up, first-stage stator vane geometry. Infrared thermography was used to measure surface temperatures on a constant heat flux plate placed on the endwall surface. Laser-Doppler Velocimetry (LDV) measurements were performed of all three components of the mean and fluctuating velocities of the leading edge horseshoe vortex. The results indicate that the mean flowfields for the leading edge horseshoe vortex were similar between the low and high free-stream turbulence cases. High turbulence levels in the leading edge–endwall juncture were attributed to a vortex unsteadiness for both the low and high free-stream turbulence cases. While, in general, the high free-stream turbulence increased the endwall heat transfer, low augmentations were found to coincide with the regions having the most intense vortex motions. [S0889-504X(00)00704-2]
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October 2000
Technical Papers
High Free-Steam Turbulence Effects on Endwall Heat Transfer for a Gas Turbine Stator Vane
R. W. Radomsky,
R. W. Radomsky
Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060
11
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K. A. Thole
K. A. Thole
Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060
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R. W. Radomsky
11
Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060
K. A. Thole
Mechanical Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060
Contributed by the International Gas Turbine Institute and presented at the 45th International Gas Turbine and Aeroengine Congress and Exhibition, Munich, Germany, May 8–11, 2000. Manuscript received by the International Gas Turbine Institute February 2000. Paper No. 2000-GT-201. Review Chair: D. Ballal.
J. Turbomach. Oct 2000, 122(4): 699-708 (10 pages)
Published Online: February 1, 2000
Article history
Received:
February 1, 2000
Citation
Radomsky, R. W., and Thole, K. A. (February 1, 2000). "High Free-Steam Turbulence Effects on Endwall Heat Transfer for a Gas Turbine Stator Vane ." ASME. J. Turbomach. October 2000; 122(4): 699–708. https://doi.org/10.1115/1.1312807
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