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Caractérisation statistique des sources aéroacoustiques en jets supersoniques par Vélocimétrie Laser à effet Doppler

Abstract : The prediction of jet mixing noise using an acoustic analogy and based on experimental measurements is here investigated in the case of a supersonic jet. The basis of any acoustic analogy is the representation of the specifics spatial and temporal organisations of the turbulent field in terms a spatiotemporal correlation tensor of the turbulence velocity. This quantity gives information on the dynamic and efficiency of the mechanisms of conversion of the turbulence kinetic energy into acoustic energy. Turbulence and source properties such as integral length and time scales, as well as convection velocity are commonly used to characterised the mixing processes and used for accurately modelling the spatiotemporal correlation tensor. The accuracy of the noise prediction is therefore related to the accuracy with which this tensor is modelled. Modelling of this quantity, based on experimental two-point Laser Doppler Velocimetry measurements in the case of a supersonic jet is here proposed. The turbulence field is here assumed to be homogeneous and isotropic so that the tensor can be reduced to one component only. The prediction of the noise radiated by the flow requires also the spatial distribution of the energy of the sources to be known. An aerodynamic code is here used and validated by experimental measurements in a hot supersonic jet. Additional measurements have been performed to study the spectral content of the turbulent field and its evolution along the flow in such typical jets. This highlight on how the turbulent kinetic energy is efficiently used by the different components of the turbulent field. The noise radiated by the hot supersonic jet is finally predicted using a numerical code based on the Lighthill's acoustic analogy and the model established for the correlation tensor obtained from the experimental measurements.
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https://tel.archives-ouvertes.fr/tel-00007612
Contributor : Franck Kerherve <>
Submitted on : Friday, December 3, 2004 - 11:06:52 AM
Last modification on : Monday, November 9, 2020 - 2:58:02 PM
Long-term archiving on: : Thursday, September 13, 2012 - 1:20:42 PM

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  • HAL Id : tel-00007612, version 1

Citation

Franck Kerhervé. Caractérisation statistique des sources aéroacoustiques en jets supersoniques par Vélocimétrie Laser à effet Doppler. Acoustique [physics.class-ph]. Université de Poitiers, 2004. Français. ⟨tel-00007612⟩

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