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Response of the Separated Flow over an Airfoil to a Short-Time Actuator Burst

An, Xuanhong and Williams, David R. and de Castro da Silva, André Fernando and Colonius, Tim and Eldredge, Jeff D. (2017) Response of the Separated Flow over an Airfoil to a Short-Time Actuator Burst. In: 47th AIAA Fluid Dynamics Conference, 5-9 June 2017, Denver, CO.

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Experimental measurements of the flow structure evolving in the separated flow over an NACA 0009 wing at 12° angle of attack were obtained with particle image velocimetry, surface pressures, and force transducer measurements of the lift coefficient and pitching moment coefficient. Phase-averaged two-dimensional velocity field measurements provide details of the separated shear layer evolution following a four-pulse burst sequence from a synthetic jet actuator. The flow field development is quite similar to the observations made by Brzozowski, et al. (2010), who used a pulsed-combustion actuator that is orders of magnitude stronger than the synthetic jet. Proper orthogonal decomposition of the PIV data sets showed that the combination of the time-varying coefficients modes 1 and 2 correlate with the negative of the lift coefficient response. The surface pressure signals were correlated with the roll up and convection of the large-scale vortex structure that follows the actuator burst input. A spatially localized region of high pressure occurs below and slightly behind a "kink" that forms in the shear layer. A localized region of high surface pressure that follows the kinked region correlates with the lift reversal that occurs within 2.0t^+ after the burst signal was triggered.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Paper Paper
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2017 American Institute of Aeronautics and Astronautics. Published Online: 2 Jun 2017. Support by the U.S. Air Force Office of Scientific Research (FA9550-14-1-0328) with program manager Dr. Douglas Smith is gratefully acknowledged.
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Air Force Office of Scientific Research (AFOSR)FA9550-14-1-0328
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AIAA Paper2017-3315
Record Number:CaltechAUTHORS:20190709-092058182
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96945
Deposited By: Melissa Ray
Deposited On:09 Jul 2019 23:54
Last Modified:16 Nov 2021 17:24

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