High speed PIV applied to aerodynamic noise investigation

In this paper, we study the acoustic emissions of the flow over a rectangular cavity. Especially, we investigate the possibility of estimating the acoustic emission by analysis of PIV data. Such a possibility is appealing, since it would allow to directly relate the flow behavior to the aerodynamic...

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Bibliographic Details
Published in:	Experiments in fluids Vol. 50; no. 4; pp. 863 - 876
Main Authors:	Koschatzky, V., Moore, P. D., Westerweel, J., Scarano, F., Boersma, B. J.
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Berlin/Heidelberg Springer-Verlag 01-04-2011 Springer
Subjects:	Acoustic emission Acoustics Aeroacoustics, atmospheric sound Aerodynamic noise Computational fluid dynamics Engineering Engineering Fluid Dynamics Engineering Thermodynamics Estimating Exact sciences and technology Fluid dynamics Fluid flow Fluid- and Aerodynamics Fundamental areas of phenomenology (including applications) Heat and Mass Transfer High speed Holes Instrumentation for fluid dynamics Physics Research Article Sound Acoustic Emission Cavity Wall Pressure Fluctuation Acoustic Pressure Shear Layer Test facility Speed measurement Particle image velocimetry Cavity resonator Measurement method Boundary condition Experimental study Aeroacoustics Sound pressure
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Summary:	In this paper, we study the acoustic emissions of the flow over a rectangular cavity. Especially, we investigate the possibility of estimating the acoustic emission by analysis of PIV data. Such a possibility is appealing, since it would allow to directly relate the flow behavior to the aerodynamic noise production. This will help considerably in understanding the noise production mechanisms and to investigate the possible ways of reducing it. In this study, we consider an open cavity with an aspect ratio between its length and depth of 2 at a Reynolds number of 2.4 × 10 4 and 3.0 × 10 4 based on the cavity length. The study is carried out combining high speed two-dimensional PIV, wall pressure measurements and sound measurements. The pressure field is computed from the PIV data. Curle’s analogy is applied to obtain the acoustic pressure field. The pressure measurements on the wall of the cavity and the sound measurements are then used to validate the results obtained from PIV and check the range of validity of this approach. This study demonstrated that the technique is able to quantify the acoustic emissions from the cavity and is promising especially for capturing the tonal components on the sound emission.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0723-4864 1432-1114
DOI:	10.1007/s00348-010-0935-8