Ludovic Ambrosiani

Direct time-domain eduction of acoustic liner impedance in turbulent grazing flows

Acoustic liners are passive sound-absorbing materials widely used in engineering applications and are commonly characterised by their acoustic impedance. In the presence of high sound pressure levels or grazing flows, the impedance is modified by local nonlinear effects. Conventi...

Laser Doppler Velocimetry Measurements of Acoustic–Turbulent Flow Interaction over Liner

The interaction between a grazing turbulent boundary layer at Mach 0.3 and tonal acoustic waves with an amplitude equal to 145 dB over a single-degree-of-freedom acoustic liner is investigated experimentally using laser Doppler velocimetry. Streamwise and wall-normal velocity pro...