The effects of inner boundary layer thickness on the near pressure field of a subsonic jet
Résumé
In this work, the effects of the jet's initial conditions on the aeroacoustic properties are studied. The present investigation has been carried out using a Large Eddy Simulation (LES) database containing pressure time series covering a domain that varies in the stream-wise direction from x=0 up to x/D=20 and in the radial direction from r/D=0.5 (nozzle lip) up to r/D=3, where D is the jet exit diameter. As mentioned above, the key parameter we explored is the boundary-layer thickness (δ BL), which has been varied keeping fixed the nozzle exhaust turbulence intensity at T I = 0%. Specifically, the value of δ BL , normalised by the nozzle radius r 0 , spans from 0.025 up to 0.4. The acoustic component of the near pressure field of the jet is extracted by applying a wavelet-based procedure to the pressure data. The decomposed signals are then analysed separately in terms of statistical quantities.
Domaines
Physique [physics]
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