Bicoherence analysis of model-scale jet noise | Zendy

Kent L. Gee | Zendy; Anthony A. Atchley | Zendy; Lauren E. Falco | Zendy; Micah R. Shepherd | Zendy; Lawrence Ukeiley | Zendy; Bernard J. Jansen | Zendy; John Seiner | Zendy

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Bicoherence analysis of model-scale jet noise

Author(s) -

Kent L. Gee,

Anthony A. Atchley,

Lauren E. Falco,

Micah R. Shepherd,

Lawrence Ukeiley,

Bernard J. Jansen,

John Seiner

Publication year - 2010

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.3484492

Subject(s) - bicoherence , jet noise , jet (fluid) , nonlinear system , directivity , acoustics , physics , noise (video) , computational physics , scale (ratio) , mechanics , mathematics , computer science , spectral density , telecommunications , statistics , bispectrum , quantum mechanics , artificial intelligence , antenna (radio) , image (mathematics)

Bicoherence analysis has been used to characterize nonlinear effects in the propagation of noise from a model-scale, Mach-2.0, unheated jet. Nonlinear propagation effects are predominantly limited to regions near the peak directivity angle for this jet source and propagation range. The analysis also examines the practice of identifying nonlinear propagation by comparing spectra measured at two different distances and assuming far-field, linear propagation between them. This spectral comparison method can lead to erroneous conclusions regarding the role of nonlinearity when the observations are made in the geometric near field of an extended, directional radiator, such as a jet.

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