Scattering of wavepacket by a flat plate in the vicinity of a turbulent jet

André Cavalieri (1) , Peter Jordan (1) , Yves Gervais (2)

1 UP - Université de Poitiers = University of Poitiers
2 PPrime [Poitiers] - Institut Pprime [UPR 3346]

We present an investigation on the effect of the presence of a flat plate in the vicinity of turbulent, subsonic jets. Experiments have been performed to measure the changes in the velocity field and in the sound radiation for a number of Mach numbers and distances between the plate and the jet axis. Results show a significant increase of sound radiation at lower frequencies with dipolar behaviour. There is exponential decay of the scattered sound with the plate distance, in agreement with scattering of the evanescent waves in the jet near field. The final paper will present a comprehensive comparison of the experimental results with a model based on Parabolized Stability Equations, with sound propagation calculated using a tailored Green’s function.

Mots clés: scattering; jet noise

Domaines: Acoustique [physics.class-ph]

André Cavalieri, Peter Jordan, Yves Gervais. Scattering of wavepacket by a flat plate in the vicinity of a turbulent jet. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811053⟩