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contributor authorA. Ghosh
contributor authorJ. Bridges
contributor authorF. Hussain
date accessioned2017-05-08T23:48:51Z
date available2017-05-08T23:48:51Z
date copyrightApril, 1995
date issued1995
identifier issn1048-9002
identifier otherJVACEK-28820#172_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/116272
description abstractNoise generated by nearly axisymmetric vortex pairing in an excited low Mach number jet was studied experimentally as a prototypical jet noise source using a three-dimensional microphone array. The measured time-dependent sound field was decomposed into its multipole components using general linear regression techniques. Although the vortex interactions were very nearly axisymmetric and thus a nearly axisymmetric lateral quadrupole sound field was expected, the sound field was found to have large departures from axisymmetry. This acoustic sensitivity to symmetry breaking in the vorticity field was also shown in calculations using numerical vortex models and vortex sound theory. The directivity of the far-field sound gets smeared out in the time averaged data due to the tilting of the quadrupoles; this emphasizes the need for studying the jet sound pressure field in four dimensions (x, t) to better understand the mechanisms of noise generation.
publisherThe American Society of Mechanical Engineers (ASME)
titleInstantaneous Directivity in Jet Noise by Multipole Decomposition
typeJournal Paper
journal volume117
journal issue2
journal titleJournal of Vibration and Acoustics
identifier doi10.1115/1.2873876
journal fristpage172
journal lastpage179
identifier eissn1528-8927
keywordsNoise (Sound)
keywordsSound
keywordsVortices
keywordsMicrophone arrays
keywordsMechanisms
keywordsVorticity
keywordsSound pressure
keywordsMach number
keywordsAcoustics AND Dimensions
treeJournal of Vibration and Acoustics:;1995:;volume( 117 ):;issue: 002
contenttypeFulltext


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