Effects of Variable Properties in Film Cooled Turbulent Boundary Layers.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The effects of variable properties on heat transfer in a film-cooled turbulent boundary layer were investigated. A new procedure was developed to deduce adiabatic effectiveness from heat transfer coefficients based on the wall to freestream temperature difference, where both are representative of variable property flow conditions. The new technique was shown to be valid using data from the literature for injection into a turbulent boundary layer from one and two rows of injection holes. From these results, the variation of the coolant to mainstream density ratio was shown to have a significantly greater effect on heat transfer than variations of viscosity and thermal conductivity. Keywords Gas turbine cooling Film cooling Turbulent boundary layers Variable properties. Theses
- Fluid Mechanics
- Jet and Gas Turbine Engines