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Cross-correlation analysis of synchronized PIV and microphone measurements of an oscillating airfoil

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Abstract

The present study focuses on the correlation between the flow structures evolving during the dynamic stall processes of a two-dimensional NACA64-618 airfoil, which performs a sinusoidal movement about its quarter chord axis, and their aeroacoustic response in the far field. Experiments are conducted in an anechoic wind tunnel at a Reynolds number of \(8 \times 10^{5}\) based on the chord length and include simultaneous velocity field measurements in the vicinity of the airfoil and microphone measurements in the acoustic far field. A causality correlation method based on phase locked snapshots of the velocity field allows for the identification of specific structures at different phases of the dynamic stall life cycle that contribute to the sound generation process. The sound emission during the stall development and flow reattachment phases is attributed to coherent structures evolving downstream of the trailing edge. When the flow is fully stalled, the region that contributes to the sound emission increases. The position of the sound emitting coherent structures also fluctuates stronger between oscillation cycles during full stall.

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Acknowledgements

This work was supported by the German and Swiss National Science Foundation under grant number 200021E-169841.

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Authors and Affiliations

  1. German Aerospace Center (DLR), Institute for Aerodynamics and Flow Technology (AS), Göttingen, Germany

    Lars Siegel, Klaus Ehrenfried, Claus Wagner & Arne Henning

  2. Technische Universität Ilmenau, Institute of Thermodynamics and Fluid Mechanics, Ilmenau, Germany

    Lars Siegel & Claus Wagner

  3. Unsteady Flow Diagnostics Laboratory (UNFoLD), Institute of Mechanical Engineering (IGM), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

    Karen Mulleners

Authors
  1. Lars Siegel
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  2. Klaus Ehrenfried
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  3. Claus Wagner
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  4. Karen Mulleners
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  5. Arne Henning
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Correspondence to Lars Siegel.

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Siegel, L., Ehrenfried, K., Wagner, C. et al. Cross-correlation analysis of synchronized PIV and microphone measurements of an oscillating airfoil. J Vis 21, 381–395 (2018). https://doi.org/10.1007/s12650-018-0473-7

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  • DOI: https://doi.org/10.1007/s12650-018-0473-7

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