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01.05.2013 | Research Article | Ausgabe 5/2013

Experiments in Fluids 5/2013

Aeroacoustic source analysis using time-resolved PIV in a free jet

Zeitschrift:
Experiments in Fluids > Ausgabe 5/2013
Autoren:
David E. S. Breakey, John A. Fitzpatrick, Craig Meskell
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s00348-013-1531-5) contains supplementary material, which is available to authorized users.
This work was first presented in condensed form at the 16th Int Symp on Applications of Laser Techniques to Fluid Mechanics in Lisbon, Portugal, 09–12 July, 2012.
This article is part of the Topical Collection on Application of Laser Techniques to Fluid Mechanics 2012.

Abstract

Time-resolved particle image velocimetry (TR-PIV) has become a valuable tool for spatio-temporally resolved flow measurements. Current camera and laser technology has advanced such that time-domain events leading to sound generation can now be resolved over a reasonable spatial extent. This paper reports on the application of TR-PIV for the analysis of aeroacoustic sources in a free jet using the direct correlation between in-flow velocity fluctuations on the jet center-line and near-field pressure fluctuations. This correlation is considered both in the time domain and in the frequency domain (coherence), and the effect of TR-PIV errors on these estimates is considered by comparison to hot-wire anemometer measurements. In addition, a recently developed wavelet filtering technique is used to separate the acoustic and hydrodynamic components of recorded near-field pressure signals, enabling a gain in the signal-to-noise ratio. The results show that TR-PIV can recover the same time-domain correlation available from hot-wire and traditional PIV measurements, but that the frequency-domain estimates are corrupted by error, particularly at high frequencies. This result negates the principal benefit of using TR-PIV over PIV (the availability of coherence estimates). Despite this result, an analysis of the correlation signature gives evidence that large-scale, convecting, wave-like structures are associated with sound production, a result consistent with observations by many recent investigators. The analysis shows that in the presence of such large-scale structures, noise source localization based on the traditional correlation technique is ambiguous.

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