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Effects of Hole Length, Supply Plenum Geometry, and Freestream Turbulence on Film Cooling PerformanceExperimental measurements are presented in this report to document the sensitivity of film cooling performance to the hole length and coolant delivery plenum geometry. Measurements with hot-wire anemometry detail velocity, local turbulence, and spectral distributions over the exit plane of film cooling holes and downstream of injection in the coolant-freestream interaction zone. Measurements of discharge coefficients and adiabatic effectiveness are also provided. Coolant is supplied to the film cooling holes by means of a large, open plenum and through plenums which force the coolant to approach the holes either co-current or counter-current to the freestream. A single row of film cooling holes with 35 degree-inclined streamwise at two coolant-to-freestream velocity ratios, 0.5 and 1.0, is investigated. The coolant-to-freestream density ratio is maintained in the range 0.96 to 1.0. Measurements were taken under high-freestream (FSTI = 12%) and low-freestream turbulence intensity (FSTI = 0.5%) conditions. The results document the effects of the hole L/D, coolant supply plenum geometry, velocity ratio, and FSTI. In general, hole L/D and the supply plenum geometry play influential roles in the film cooling performance. Hole L/D effects, however, are more pronounced. Film cooling performance is also dependent upon the velocity ratio and FSTI.
Document ID
20000120579
Acquisition Source
Glenn Research Center
Document Type
Contractor Report (CR)
Authors
Burd, Steven W. (Minnesota Univ. Minneapolis, MN United States)
Simon, Terrence W. (Minnesota Univ. Minneapolis, MN United States)
Thurman, Douglas
Date Acquired
September 7, 2013
Publication Date
August 1, 2000
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
NASA/CR-2000-210336
E-12381
NAS 1.26:210336
Funding Number(s)
CONTRACT_GRANT: NAG3-1638
PROJECT: RTOP 714-01-4A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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