Correlations of near-And far-field acoustic data in a high-speed jet

Jacques Lewalle; Kerwin R. Low; Mark N. Glauser; Zachary P. Berger

Correlations of near-And far-field acoustic data in a high-speed jet

Jacques Lewalle, Kerwin R. Low, Mark N. Glauser, Zachary P. Berger

Applied Research Laboratory (ARL)

Research output: Contribution to conference › Paper › peer-review

2 Scopus citations

Abstract

The cross-correlations of near- and far-field pressure in a M=0.6 cold jet are oscillatory, which implies some phaselocking. A simple model and synthetic signals show that the locking may be related to the steep attenuation with distance from the near-field sensors. In the near-field, wavelet-based nonlinear filtering separates fluctuations that are recognizable at x/D = 3 and 6 ('matched') from the others ('residue'). This decomposition yields distinct signatures in the crosscorrelations. The corresponding time lags and frequencies in the cross-correlations point to several categories of sources and their locations. The interpretation is consistent with the eddy pairing or breakdown (i.e. loss of identity) as the sources of noise for short lags, but the longer time lags require another explanation.

Original language	English (US)
State	Published - 2011
Event	7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada Duration: Jul 28 2011 → Jul 31 2011

Other

Other	7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011
Country/Territory	Canada
City	Ottawa
Period	7/28/11 → 7/31/11

All Science Journal Classification (ASJC) codes

Fluid Flow and Transfer Processes

Cite this

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title = "Correlations of near-And far-field acoustic data in a high-speed jet",

abstract = "The cross-correlations of near- and far-field pressure in a M=0.6 cold jet are oscillatory, which implies some phaselocking. A simple model and synthetic signals show that the locking may be related to the steep attenuation with distance from the near-field sensors. In the near-field, wavelet-based nonlinear filtering separates fluctuations that are recognizable at x/D = 3 and 6 ('matched') from the others ('residue'). This decomposition yields distinct signatures in the crosscorrelations. The corresponding time lags and frequencies in the cross-correlations point to several categories of sources and their locations. The interpretation is consistent with the eddy pairing or breakdown (i.e. loss of identity) as the sources of noise for short lags, but the longer time lags require another explanation.",

author = "Jacques Lewalle and Low, {Kerwin R.} and Glauser, {Mark N.} and Berger, {Zachary P.}",

note = "Funding Information: The support of AFOSR under grant FA-9550-10-1-0536 (JL, MNG) and of Syracuse University through a Graduate Fellowship (KRL) is much appreciated. Publisher Copyright: {\textcopyright} 2011 Universitatsverlag Gottingen. All rights reserved.; 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 ; Conference date: 28-07-2011 Through 31-07-2011",

year = "2011",

language = "English (US)",

}

TY - CONF

T1 - Correlations of near-And far-field acoustic data in a high-speed jet

AU - Lewalle, Jacques

AU - Low, Kerwin R.

AU - Glauser, Mark N.

AU - Berger, Zachary P.

N1 - Funding Information: The support of AFOSR under grant FA-9550-10-1-0536 (JL, MNG) and of Syracuse University through a Graduate Fellowship (KRL) is much appreciated. Publisher Copyright: © 2011 Universitatsverlag Gottingen. All rights reserved.

PY - 2011

Y1 - 2011

N2 - The cross-correlations of near- and far-field pressure in a M=0.6 cold jet are oscillatory, which implies some phaselocking. A simple model and synthetic signals show that the locking may be related to the steep attenuation with distance from the near-field sensors. In the near-field, wavelet-based nonlinear filtering separates fluctuations that are recognizable at x/D = 3 and 6 ('matched') from the others ('residue'). This decomposition yields distinct signatures in the crosscorrelations. The corresponding time lags and frequencies in the cross-correlations point to several categories of sources and their locations. The interpretation is consistent with the eddy pairing or breakdown (i.e. loss of identity) as the sources of noise for short lags, but the longer time lags require another explanation.

AB - The cross-correlations of near- and far-field pressure in a M=0.6 cold jet are oscillatory, which implies some phaselocking. A simple model and synthetic signals show that the locking may be related to the steep attenuation with distance from the near-field sensors. In the near-field, wavelet-based nonlinear filtering separates fluctuations that are recognizable at x/D = 3 and 6 ('matched') from the others ('residue'). This decomposition yields distinct signatures in the crosscorrelations. The corresponding time lags and frequencies in the cross-correlations point to several categories of sources and their locations. The interpretation is consistent with the eddy pairing or breakdown (i.e. loss of identity) as the sources of noise for short lags, but the longer time lags require another explanation.

UR - http://www.scopus.com/inward/record.url?scp=85048574030&partnerID=8YFLogxK

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M3 - Paper

AN - SCOPUS:85048574030

T2 - 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011

Y2 - 28 July 2011 through 31 July 2011

ER -

Correlations of near-And far-field acoustic data in a high-speed jet

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