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Experimental investigation of turbulent coherent structures interacting with a porous airfoil

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Abstract

The flow field on solid and porous airfoils subjected to turbulence shed by an upstream cylindrical rod and the corresponding far-field noise radiations are studied through particle image velocimetry (PIV) and microphone measurements, respectively. Three different Reynolds numbers based on the rod diameter are considered in a range between \({2.7\times 10^4}\) and \({5.4\times 10^4}\), and two porous airfoil models are tested to analyze the influence of the design elements of the permeable treatment. A standard proper orthogonal decomposition (POD) algorithm is employed to band filter the different length scales that characterize the turbulent flow, making it feasible to determine which turbulence scales are affected by porosity. The aeroacoustic results indicate that the porous treatment of the wing profile leads to a noise reduction at low frequencies and a noise regeneration at high frequencies due to surface roughness. The investigation on the flow field shows that the main effect of porosity is to mitigate the turbulent kinetic energy in the stagnation region, attenuating the distortion of turbulence interacting with the airfoil surface. The application of the POD algorithm indicates that this effect acts mainly on the largest scales of turbulence.

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Acknowledgements

The authors acknowledge the support of the European Commission’s Framework Program “Horizon2020,” through the Marie Skłodowska-Curie Innovative Training Networks (ITN) “SmartAnswer - Smart mitigation of flow-induced acoustic radiation and transmission” grant agreement No. 722401, to the present research project.

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  1. von Karman Institute for Fluid Dynamics, Waterloosesteenweg 72, 1640, Sint-Genesius-Rode, Belgium

    Simone Tamaro, Riccardo Zamponi & Christophe Schram

  2. Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands

    Daniele Ragni & Christopher Teruna

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  1. Simone Tamaro
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Correspondence to Simone Tamaro.

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Tamaro, S., Zamponi, R., Ragni, D. et al. Experimental investigation of turbulent coherent structures interacting with a porous airfoil. Exp Fluids 62, 94 (2021). https://doi.org/10.1007/s00348-021-03170-2

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