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.
An Experimental Study of the Effect of Wake Passing on Turbine Blade Film Cooling
Contributed by the International Gas Turbine Institute and presented at the 42nd International Gas Turbine and Aeroengine Congress and Exposition, Orlando, Florida, June 2–5, 1997. Manuscript received at ASME Headquarters February 1997. Paper No. 97-GT-255. Associate Editor: H. A. Kidd.
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Heidmann , J. D., Lucci, B. L., and Reshotko, E. (February 1, 1997). "An Experimental Study of the Effect of Wake Passing on Turbine Blade Film Cooling ." ASME. J. Turbomach. April 2001; 123(2): 214–221. https://doi.org/10.1115/1.1354621
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