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Determination of two-dimensionalspace–timecorrelations in jetflows using simultaneous PIV and LDV measurements

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) Kerherve Franck; Fitzpatrick John; Chatellier Ludovic
journal (abréviation) Experimental Thermal and Fluid Science (Exp. Therm. Fluid Science)
volume (numéro) 34(6)
pages 788 – 797
  Sous presse
résumé The two-dimensionalspace–time turbulence statistics of free shear jetflows in the form of the two-point velocity correlation tensor are important for aeroacoustic noise source modelling based on the acoustic analogy approach. This paper presents a direct application of the Point-Referenced Global Correlation (PRGC) technique to measure the components of this correlation tensor for a sector of the flow field in twojet configurations. The PRGC approach combines single point and global measurement techniques and enables two-point space–timecorrelations over a region of the flow to be obtained. The technique is applied to a single stream jet and a co-axial coplanar jet at a Mach number of 0.24 using commercial Laser Doppler velocimetry (LDV) and low-speed particle image velocimetry (PIV) systems. Results for the one-dimensionalcorrelations are shown to compare well with two-point measurements. The results for the two-dimensionalspace–timecorrelations are presented and the characteristics for both configurations discussed.
mots clés Jetflows, Laser Doppler velocimetry, Particle image velocimetry, Two-point statistics
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