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Correlation of Jet Noise Data in Terms of a Self Noise-Shear Noise Model.
TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES
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The theoretical formalism of Ribner 1964 and 1969 was applied in the analysis of a large body of experimental jet noise data. It was found that the basic directivity which results on excluding convection and refraction effects could be decomposed unambiguously into self noise and shear noise. The basic self noise spectrum peaked approximately one octave higher than the shear noise spectrum, and the peak amplitudes were roughly in the ratio two to one. Upon frequency shifting and normalizing alignments, the two spectra were found to match well in shape. All these properties are in accord with the theory. The self noise-shear noise spectral similarity was applied in a formalism for jet noise prediction utilizing the theory.
APPROVED FOR PUBLIC RELEASE