Quantitative nonlinearity analysis of model-scale jet noise

Kyle G. Miller, Brent O. Reichman, Kent L. Gee, Tracianne B. Neilsen, Anthony A. Atchley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The effects of nonlinearity on the power spectrum of jet noise can be directly compared with those of atmospheric absorption and geometric spreading through an ensemble-averaged, frequency-domain version of the generalized Burgers equation (GBE) [B. O. Reichman et al., J. Acoust. Soc. Am. 136, 2102 (2014)]. The rate of change in the sound pressure level due to the nonlinearity, in decibels per jet nozzle diameter, is calculated using a dimensionless form of the quadspectrum of the pressure and the squared-pressure waveforms. In this paper, this formulation is applied to atmospheric propagation of a spherically spreading, initial sinusoid and unheated model-scale supersonic (Mach 2.0) jet data. The rate of change in level due to nonlinearity is calculated and compared with estimated effects due to absorption and geometric spreading. Comparing these losses with the change predicted due to nonlinearity shows that absorption and nonlinearity are of similar magnitude in the geometric far field, where shocks are present, which causes the high-frequency spectral shape to remain unchanged.

Original languageEnglish (US)
Title of host publicationRecent Developments in Nonlinear Acoustics
Subtitle of host publication20th International Symposium on Nonlinear Acoustics including the 2nd International Sonic Boom Forum
EditorsVictor W. Sparrow, Didier Dragna, Philippe Blanc-Benon
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735413320
DOIs
StatePublished - Oct 28 2015
Event20th International Symposium on Nonlinear Acoustics, ISNA 2015, including the 2nd International Sonic Boom Forum, ISBF 2015 - Ecully, Lyon, France
Duration: Jun 29 2015Jul 3 2015

Publication series

NameAIP Conference Proceedings
Volume1685
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other20th International Symposium on Nonlinear Acoustics, ISNA 2015, including the 2nd International Sonic Boom Forum, ISBF 2015
CountryFrance
CityEcully, Lyon
Period6/29/157/3/15

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Miller, K. G., Reichman, B. O., Gee, K. L., Neilsen, T. B., & Atchley, A. A. (2015). Quantitative nonlinearity analysis of model-scale jet noise. In V. W. Sparrow, D. Dragna, & P. Blanc-Benon (Eds.), Recent Developments in Nonlinear Acoustics: 20th International Symposium on Nonlinear Acoustics including the 2nd International Sonic Boom Forum [090003] (AIP Conference Proceedings; Vol. 1685). American Institute of Physics Inc.. https://doi.org/10.1063/1.4934469