Discharge coefficients for combustor-liner air-entry holes II : flush rectangular holes, step louvers, and scoops

Ralph T. Dittrich
naca-tn-3924
Apr 1958


Experimental discharge coefficients for various types of combustor-liner air-entry holes are presented as a function of a dimensionless flow parameter. In general, scoops and step louvers have higher discharge coefficients and wider flow ranges than flush holes. The effects of size or shape of a given type of hole are small. The proximity of multiple flush holes or the wall inclination of a convergent duct has a negligible effect on discharge coefficient.

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