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International Heat Transfer Conference 4

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

DOWNSTREAM INFLUENCE OF FILM-COOLING IN A SUPERSONIC TURBULENT BOUNDARY LAYER

Anthony L. Laganelli
General Electric Co., Valley Forge, Pennsylvania, U.S.A.

DOI: 10.1615/IHTC4.2480
pages 1-12

Abstract

A method for predicting film-cooling effectiveness in supersonic turbulent boundary layers is developed which considers two-dimensional and axisymmetric flow. The approach utilizes the Eckert reference enthalpy method which allows one to approximate an actual compressible condition to an effective incompressible case. A further modification is included that applies a step - temperature distribution at the intersection of the injecting and solid section to correct for the temperature discontinuity in the immediate downstream region from the ejecting site. A comparison is made to the limited number of available data in supersonic flow and shows fair agreement to flush and rear-facing slot geometries and good agreement with porous type injecting geometries. The comparison was made for air and foreign gas injection data.

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