An Experimental Study of the Effect of Wake Passing on Turbine Blade Film Cooling-Reference-Cited by-同舟云学术

An Experimental Study of the Effect of Wake Passing on Turbine Blade Film Cooling

Published:1997-02-01 Issue:2 Volume:123 Page:214-221
ISSN:0889-504X
Container-title:Journal of Turbomachinery
language:en
Short-container-title:

Author:

Heidmann James D.¹,Lucci Barbara L.¹,Reshotko Eli²

Affiliation:

1. NASA Glenn Research Center, Cleveland, OH

2. Case Western Reserve University, Department of Mechanical and Aerospace Engineering, Cleveland, OH

Abstract

The effect of wake passing on the showerhead film cooling performance of a turbine blade has been investigated experimentally. The experiments were performed in an annular turbine cascade with an upstream rotating row of cylindrical rods. Nickel thin-film gauges were used to determine local film effectiveness and Nusselt number values for various injectants, blowing ratios, and Strouhal numbers. Results indicated a reduction in film effectiveness with increasing Strouhal number, as well as the expected increase in film effectiveness with blowing ratio. An equation was developed to correlate the span-average film effectiveness data. The primary effect of wake unsteadiness was found to be correlated by a streamwise-constant decrement of 0.094St. Steady computations were found to be in excellent agreement with experimental Nusselt numbers, but to overpredict experimental film effectiveness values. This is likely due to the inability to match actual hole exit velocity profiles and the absence of a credible turbulence model for film cooling.

Publisher

ASME International

Subject

Mechanical Engineering

Link

http://asmedigitalcollection.asme.org/turbomachinery/article-pdf/123/2/214/5601614/214_1.pdf

Reference30 articles.

1. Goldstein, R. J. , 1971, “Film Cooling,” Advances in Heat Transfer, 7, pp. 321–379.

2. Heidmann, J. D., 1996, “The Effect of Wake Passing on Turbine Blade Film Cooling,” NASA TM-107380 and Ph.D. Dissertation, Case Western Reserve University (1997).

3. Heidmann, J. D., Rigby, D. L., and Ameri, A. A., 2000, “A Three-Dimensional Coupled Internal/External Simulation of a Film-Cooled Turbine Vane,” ASME J. Turbomach., 122, pp. 348–359.

4. Rigby, M. J., Johnson, A. B., and Oldfield, M. L. G., 1990, “Gas Turbine Rotor Blade Film Cooling With and Without Simulated NGV Shock Waves and Wakes,” ASME Paper No. 90-GT-78.

5. Ou, S., Han, J.-C., Mehendale, A. B., and Lee, C. P., 1994, “Unsteady Wake Over a Linear Turbine Blade Cascade With Air and CO2 Film Injection: Part I-Effect on Heat Transfer Coefficients,” ASME J. Turbomach., 116, pp. 721–729.

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