Henning, Arne and Käpernick, Kristian and Ehrenfried, Klaus and Koop, Lars and Dillmann, Andreas (2006) Investigation of Aeroacoustic Noise Generation by Simultaneous Particle Image Velocimetry and Microphone Measurement. Experiments in Fluids, Vol. 348, pp. 1073-1085. Springer Verlag Berlin/Heidelberg. DOI: 10.1007/s00348-008-0528-y. ISSN 0723-4864 (print) 1432-1114 (online).
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An experimental investigation involving simultaneous measurements of a flow field and the generated sound is performed. The velocity field around a circular cylinder is measured by Particle Image Velocimetry (PIV) while the radiated sound is recorded with a microphone. Both measurements are conducted in a synchronized manner to enable the calculation of the cross correlation between the flow field and pressure data. The therewith obtained coefficient matrix provides time and space resolved information about the dependency between the flow structures and the pressure fluctuations in the far field in a statistical manner. To improve the signal to noise ratio of the cross correlation function a proper orthogonal decomposition (POD) is applied to the velocity field. The methods seem to be promising to identify flow structures which are correlated with the sources of noise. The developed methods are then applied to the more application related problem of the flow field inside a leading-edge slat-cove.
|Title:||Investigation of Aeroacoustic Noise Generation by Simultaneous Particle Image Velocimetry and Microphone Measurement|
|Date:||2 October 2006|
|Journal or Publication Title:||Experiments in Fluids|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1073-1085|
|Publisher:||Springer Verlag Berlin/Heidelberg|
|Series Name:||Experimental Methods and their Applications to Fluid Flow|
|ISSN:||0723-4864 (print) 1432-1114 (online)|
|Keywords:||PIV, POD, Correlation|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Flight Physics|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Helicopters|
Institute of Aerodynamics and Flow Technology > Experimental Methods
|Deposited By:||Ilka Micknaus|
|Deposited On:||06 Jul 2007|
|Last Modified:||14 Jan 2010 23:30|
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