INVESTIGATION OF THE WALL PRESSURE WAVENUMBER-FREQUENCY SPECTRUM BENEATH A TURBULENT BOUNDARY LAYER WITH PRESSURE GRADIENT

Edouard Salze (1) , Christophe Bailly (1) , Olivier Marsden (1) , Daniel Juvé (1)

1 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique

Wall pressure fluctuations beneath a turbulent boundary layer in the presence of a mean pressure gradient are investigated in this study. The mean pressure gradient is achieved by changing the ceiling angle of a rectangular channel designed for flow-acoustic measurements. Wall pressure spectra are measured for zero-, adverse-and favorable-pressure-gradient boundary layers by using a pin-hole microphone in conjunction with a high-frequency-calibration procedure. A direct measurement of the wall pressure wavenumber-frequency spectrum Φ pp (k 1 , k 2 , ω) is also performed with the use of a rotating linear antenna of remote microphones. The microphone array has been optimized to improve its response with respect to previous works (Arguillat et al., 2010). Both aerodynamic and acoustic components of the wavenumber-frequency spectrum can thus be identified and are investigated.

Domaines: Acoustique [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Edouard Salze, Christophe Bailly, Olivier Marsden, Daniel Juvé. INVESTIGATION OF THE WALL PRESSURE WAVENUMBER-FREQUENCY SPECTRUM BENEATH A TURBULENT BOUNDARY LAYER WITH PRESSURE GRADIENT. International Symposium On Turbulence and Shear Flow Phenomena (TSFP-9), Jun 2015, Melbourne, Australia. ⟨hal-02409442⟩