Piecewise-spreading regime model for calculating effective gol'dberg numbers for supersonic jet noise

Baars, W, Tinney, C and Hamilton, M 2016, 'Piecewise-spreading regime model for calculating effective gol'dberg numbers for supersonic jet noise', AIAA Journal, vol. 54, no. 9, pp. 2833-2842.


Document type: Journal Article
Collection: Journal Articles

Title Piecewise-spreading regime model for calculating effective gol'dberg numbers for supersonic jet noise
Author(s) Baars, W
Tinney, C
Hamilton, M
Year 2016
Journal name AIAA Journal
Volume number 54
Issue number 9
Start page 2833
End page 2842
Total pages 10
Publisher American Institute of Aeronautics and Astronautics, Inc.
Abstract A method for calculating the effective Gol'dberg number for diverging waveforms is presented, which leverages known features of a high-speed jet and its associated sound field. The approach employs a ray tube situated along the Mach wave angle where the sound field is not only most intense, but advances from undergoing cylindrical decay to spherical decay. Unlike other efforts, a "piecewise-spreading regime" model is employed, which yields, separately, effective Gol'dberg numbers for the cylindrically and spherically spreading regions in the far field. The new approach is applied to a plethora of experimental databases, encompassing both laboratory-and full-scale jet noise studies. The findings demonstrate how cumulative nonlinear distortion is expected to form in the acoustic near field of laboratoryscale round jets where pressure amplitudes decay cylindrically; waveformdistortion is not expected in the acoustic far field where waveform amplitudes diverge spherically. On the other hand, where full-scale jet studies are concerned, effective Gol'dberg number calculations demonstrate how cumulative waveform distortion is significant in both the cylindrical-and spherical-spreading regimes. The laboratory-scale studies also reveal a pronounced sensitivity to humidity conditions, relative to the full-scale counterpart.
Subject Aerodynamics (excl. Hypersonic Aerodynamics)
DOI - identifier 10.2514/1.J054790
Copyright notice Copyright © 2016 by W. J. Baars, C. E. Tinney, and M. F. Hamilton.
ISSN 0001-1452
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