Investigation of turbulence-surface interaction noise mechanisms and their reduction using porous materials
R. (Riccardo) Zamponi
The investigation of the noise generation mechanisms involved in the interaction of a blade profile with incoming turbulence represents a core topic for a great variety of application fields. These in-clude airframe noise, aeronautical propulsion systems, and HVAC systems for automotive. In this framework, promising concepts for the implementation of novel sound mitigation techniques are based on the use of porous materials. The present research aims at experimentally investigating the airfoil-turbulence interaction noise reduction by means of a porous treatment of the wing profile. An innovative design for integrating melamine foam in the structure of a NACA-0024 airfoil has been developed at the von Karman Institute for Fluid Dynamics, in Brussels. A solid and a porous version of the wing profile have been tested in a rod-airfoil configuration at different flow velocities. The noise attenuation has been evaluated by applying an advanced generalized inverse beamforming technique, whereas the flow field around the wing profiles has been characterized through hot-wire anemometry and particle image velocimetry. The analysis highlighted the important role played by the attenuation of the distortion experienced by turbulence in the immediate vicinity of the porous surface on the noise reduction.
- Zamponi, R., Van de Wyer, N. and Schram, C.F., 2018. Benchmark assessment of an improved regularization technique for generalized inverse beamforming. In 2018 AIAA/CEAS Aeroacoustics Conference (p. 4106). DOI: 10.2514/6.2018-4106
- Zamponi, R., Van de Wyer, N. and Schram, C.F., 2019. Experimental investigation of airfoil turbulence-impingement noise reduction using porous treatment. In 25th AIAA/CEAS Aeroacoustics Conference (p. 2649). DOI: 10.2514/6.2019-2649
- Zamponi, R., Chiariotti, P., Battista, G., Schram, C. and Castellini, P., 2020. 3D Generalized Inverse Beamforming in wind tunnel aeroacoustic testing: application to a Counter Rotating Open Rotor aircraft model. Applied Acoustics, 163, p.107229. DOI: 10.1016/j.apacoust.2020.107229
I studied Design-Mechanical Engineering at the Polytechnic University of Marche, Italy. I am currently carrying out my Ph.D. at von Karman Institute for Fluid Dynamics, Belgium, in collaboration with TU Delft in the framework of the ITN SmartAnswer. My research involves the investigation of turbulence-interaction noise reduction through porosity, with a special focus put on the analysis of the distortion experienced by the turbulence in the interaction with the porous surface.
