Experimental Investigation of Near-Field Aeroacoustic Characteristics of a Pre- and Post-Stall NACA 65-410 Airfoil
Publication: Journal of Aerospace Engineering
Volume 34, Issue 6
Abstract
The present study reports an experimental investigation of the near-field aeroacoustic characteristics of a cambered NACA 65-410 airfoil. The experiments were performed in an aeroacoustic wind tunnel facility at a moderate chord-based Reynolds number of . Detailed static and dynamic surface pressure information was recorded to reveal the pre- and post-stall dynamics. By varying the angle of attack from 7° to 15°, a stall behavior similar to thin airfoil stall is observed from the evolution of the static and dynamic surface pressure spectra at different chordwise locations. Moreover, while the surface pressure spectra show a monotonic decrease with constant gradients after entering full stall, the pre-stall behavior shows a different trend and partly resembles the attached and stalled flows. Furthermore, the unsteady surface pressure spectra are compared to those obtained from a NACA 0012 airfoil, showing notable differences in the near-field stall dynamics. A scaling formula proposed by a previous study is applied to the present pressure spectra and found to scale well except for measurements close to the leading edge. The present near-field measurements and the streamwise and spanwise length scales can be useful input to the modeling of airfoil separation and stall noise for cambered airfoils.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to acknowledge the financial support from Engineering and Physical Sciences Research Council (EPSRC) for the present study via research Grant No. EP/R010846/1 and the second author would like to also acknowledge the support from EPSRC DTP scholarship.
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Published In
Journal of Aerospace Engineering
Volume 34 • Issue 6 • November 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 2, 2020
Accepted: Apr 27, 2021
Published online: Aug 4, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 4, 2022
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