NDLI: Effects of hole length, supply plenum geometry, and freestream turbulence on film cooling performance

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Effects of hole length, supply plenum geometry, and freestream turbulence on film cooling performance

Content Provider	NASA Technical Reports Server (NTRS)
Author	Burd, Steven W. Simon, Terrence W.
Copyright Year	2000
Description	Experimental 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.
File Size	18078360
File Format	PDF
Language	English
Publisher Date	2000-08-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Thermodynamics Geometry Turbulence Performance Tests Hole Distribution Mechanics Gas Turbine Engines Coolants Plenum Chambers Film Cooling Velocity Distribution Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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