Two techniques for PIV-based aeroacoustic prediction and their application to a rod-airfoil experiment |
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Authors: | Peter Moore Valerio Lorenzoni Fulvio Scarano |
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Institution: | (1) Kluyverweg 2, 2629 Delft, HT, The Netherlands |
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Abstract: | In this paper, we discuss techniques by which the aeroacoustic properties of the turbulent flow in a rod-airfoil benchmark
experiment can be inferred from time-resolved PIV measurement. While acoustic measurements can be made directly using microphones,
the proposed techniques provide a means to directly link acoustic waves with specific flow events, which is invaluable in
devising noise mitigation strategies. The approaches are possible thanks to recent improvements in digital and camera technology
that can provide time-resolved measurements in air flows, necessary for the determination of unsteady flow quantities related
to aeroacoustic production. Both techniques are based on Curle’s acoustic analogy, where one is based on Lagrangian determination
of the required quantities, while the other requires all flow quantities to be converted into Fourier modes. Application of
both techniques yields results that are in reasonable agreement with microphone noise measurements for the rod-airfoil experiment. |
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