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High speed PIV applied to aerodynamic noise investigation

High speed PIV applied to aerodynamic noise investigation,10.1007/s00348-010-0935-8,Experiments in Fluids,V. Koschatzky,P. D. Moore,J. Westerweel,F. S

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High speed PIV applied to aerodynamic noise investigation   (Citations: 3)
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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 × 104 and 3.0 × 104 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.
Journal: Experiments in Fluids - EXP FLUID , vol. 50, no. 4, pp. 863-876, 2011
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    • ...Recently, Haigermoser (2009) has applied Curle’s acoustic analogy to PIV cavity data in water, while Koschatzky et al. (2009, 2010) has done similarly in air...
    • ...Note that this method is used by Koschatzky et al. (2009, 2010) for the case of shear-layer-driven cavity flow, but in this case, flush-mounted microphones were placed in the cavity verifying that the static pressure is accurately computed from PIV using this method...

    Peter Moore, et al. Two techniques for PIV-based aeroacoustic prediction and their applica...

    • ...Aeroacoustic predictions of flows interacting with bodysurfaces (Haigermoser 2009; Koschatzky et al. 2010; Lorenzoni et al. 2009) is a recent field where the aforementioned methods are applied to time-resolved PIV to extract the body-surface pressure distribution which is used to predict the instantaneous far-field acoustic pressure by means of Curle’s analogy (1955)...
    • ...The explicit use of acoustic analogies for sound prediction with timeresolved PIV was done by Haigermoser (2009) for cavity noise studies and, later, by Koschatzky et al. (2010)...
    • ...In the above equations, the viscous term is not included as commonly assumed in other studies at Re [ 10 3 (Haigermoser 2009; de Kat et al. 2009; Koschatzky et al. 2010; Lorenzoni et al. 2009)...

    Daniele Violato, et al. Lagrangian and Eulerian pressure field evaluation of rod-airfoil flow ...

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