Thermal Field and Flow Visualization Within the Stagnation Region of a Film-Cooled Turbine Vane

Author:

Cutbirth J. Michael1,Bogard David G.1

Affiliation:

1. Mechanical Engineering Department, University of Texas at Austin, Austin, TX 78712

Abstract

Abstract To develop quality computational codes for the film cooling of a turbine vane, a detailed understanding is needed of the physical mechanisms of the mainstream-coolant interactions. In this study flow visualization, thermal profiles, and laser Doppler velocimetry measurements were used to define the thermal and velocity fields of the film cooled showerhead region of a turbine vane. The showerhead consisted of six rows of spanwise oriented coolant holes, and blowing ratios ranged from 0.5 to 2.0. Performances with low and high mainstream turbulence levels were tested. Coolant jets from the showerhead were completely separated from the surface even at relatively low blowing ratios. However, the interaction of the coolant jets from laterally adjacent holes created a barrier to the mainstream flow, resulting in relatively high adiabatic effectiveness.

Publisher

ASME International

Subject

Mechanical Engineering

Reference16 articles.

1. Polanka, M. D., 1999, “Detailed Film Cooling Effectiveness and Three Component Velocity Field Measurements on a First Stage Turbine Vane Subject to High Freestream Turbulence,” Ph.D. dissertation, The University of Texas at Austin, Austin, TX.

2. Drost, U., and Bo¨lcs, A., 1999, “Performance of a Turbine Airfoil with Multiple Film Cooling Stations Part 1: Heat Transfer and Film Cooling Effectiveness,” ASME Paper No. 99-GT-171.

3. Du, H., Han, J.-C., and Ekkad, S. V., 1997, “Effect of Unsteady Wake on Detailed Heat Transfer Coefficient and Film Effectiveness Distributions for a Gas Turbine Blade,” ASME Paper No. 97-GT-166.

4. Takeishi, K., Aoki, S., Sato, T., and Tsukagoshi, K., 1992, “Film Cooling on a Gas Turbine Rotor Blade,” ASME J. Turbomach., 114, pp. 828–834.

5. Thole, K. A., Sinha, A. K., Bogard, D. G., and Crawford, M. E., 1992, “Mean Temperature Measurements if Jets With a Crossflow for Gas Turbine Film Cooling Application,” Rotating Machinery Transport Phenomena, J. H. Kim and W. J. Yang, eds., Hemisphere Pub. Corp., New York, NY, pp. 65–81.

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