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Vortex dynamics and sound emission in excited high-speed jets

Published online by Cambridge University Press:  29 January 2018

Michael Crawley ,
Lior Gefen Open the ORCID record for Lior Gefen [Opens in a new window] ,
Ching-Wen Kuo ,
Mo Samimy Open the ORCID record for Mo Samimy [Opens in a new window]  and
Roberto Camussi
Michael Crawley
Affiliation:
General Atomics Aeronautical Systems Inc., Poway, CA 92122, USA
Lior Gefen
Affiliation:
Università degli studi Roma Tre, Dipartimento di Ingegneria, Via della Vasca Navale, 79, 00146 Roma, Italia
Ching-Wen Kuo
Affiliation:
Aerospace Research Center, The Ohio State University, Columbus, OH 43235, USA
Mo Samimy*
Affiliation:
Aerospace Research Center, The Ohio State University, Columbus, OH 43235, USA
Roberto Camussi
Affiliation:
Università degli studi Roma Tre, Dipartimento di Ingegneria, Via della Vasca Navale, 79, 00146 Roma, Italia
*
†Email address for correspondence: Samimy.1@osu.edu
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Abstract

This work aims to study the dynamics of and noise generated by large-scale structures in a Mach 0.9 turbulent jet of Reynolds number $6.2\times 10^{5}$ using plasma-based excitation of shear layer instabilities. The excitation frequency is varied to produce individual or periodic coherent ring vortices in the shear layer. First, two-point cross-correlations are used between the acoustic near field and far field in order to identify the dominant noise source region. The large-scale structure interactions are then investigated by stochastically estimating time-resolved velocity fields using time-resolved near-field pressure traces and non-time-resolved planar velocity snapshots (obtained by particle image velocimetry) by means of an artificial neural network. The estimated time-resolved velocity fields show multiple mergings of large-scale structures in the shear layer, and indicate that disintegration of coherent ring vortices is the dominant aeroacoustic source mechanism for the jet studied here. However, the merging of vortices in the initial shear layer is also identified as a non-trivial noise source mechanism.

JFM classification

Acoustics: Aeroacoustics Flow Control: Flow Control Acoustics: Jet noise
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 839 , 25 March 2018 , pp. 313 - 347
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Copyright
© 2018 Cambridge University Press 

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