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An Experimental Study of the Effect of Wake Passing on Turbine Blade Film CoolingThe 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 0.094.St. 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.
Document ID
19970012908
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Heidmann, James D. (NASA Lewis Research Center Cleveland, OH United States)
Lucci, Barbara L. (NASA Lewis Research Center Cleveland, OH United States)
Reshotko, Eli (Case Western Reserve Univ. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1997
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NAS 1.15:107425
E-10671
NASA-TM-107425
Report Number: NAS 1.15:107425
Report Number: E-10671
Report Number: NASA-TM-107425
Meeting Information
Meeting: Turbo Expo
Location: Orlando, FL
Country: United States
Start Date: June 2, 1997
End Date: June 5, 1997
Sponsors: American Society of Mechanical Engineers
Accession Number
97N17034
Funding Number(s)
PROJECT: RTOP 505-62-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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