Characterization of the Noise Sources in a Rod-Airfoil Configuration by Means of Time-Resolved Tomographic PIV | Zendy

Valerio Lorenzoni | Zendy; Daniele Violato | Zendy; Fulvio Scarano | Zendy

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Characterization of the Noise Sources in a Rod-Airfoil Configuration by Means of Time-Resolved Tomographic PIV

Author(s) -

Valerio Lorenzoni,

Daniele Violato,

Fulvio Scarano

Publication year - 2010

Publication title -

28th aiaa/ceas aeroacoustics 2022 conference

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.2010-3898

Subject(s) - airfoil , naca airfoil , physics , vortex , starting vortex , aeroacoustics , leading edge , acoustics , noise (video) , sound pressure , pressure gradient , mechanics , turbulence , vortex ring , reynolds number , computer science , artificial intelligence , image (mathematics)

Time-resolved Tomographic PIV was used to characterize the flow around the leading edge of a NACA 0012 airfoil in rod-airfoil configuration at ReD = 3500. The volumetric approach at relatively high temporal resolution allows the measurement of the evolution of the 3D vortical structures constituting the Karman wake of the rod at interaction with the airfoil. The pressure gradient is reconstructed exploiting the definition of Lagrangian derivative and the pressure field is obtained by spatial integration of the Poisson equation. Time-correlation is performed between the aeroacoustic sources of Curle's aeroacoustic analogy and Vortex Sound Theory represented by respectively, time derivative of the pressure fluctuations at the surface and time derivative of the Lamb vector in the surrounding flow. The region of highest correlation is located underneath the airfoil leading edge and appears not to coincide with the region of most intense vortex stretching

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