@inproceedings{98e12ac9a25c4830a30035672158c7d7,
title = "Effects of structural motion on the aerodynamics of the X-56A airfoil",
abstract = "This work presents experimental and computational results related to the effects of structural motion on the aerodynamics of the X-56A airfoil. An oscillatory plunging mechanism has been fabricated and installed in a subsonic wind tunnel. The static characteristics of the X-56A were verified before focusing on the unsteady behavior at Re=200k (based on airfoil chord). Some instantaneous angles of attack during the airfoil oscillations are beyond the linear CL-alpha regime (for a nominal angle of 10 degrees). At a nominal angle of 12 degrees, the instantaneous angles of attack due to oscillations extend past those associated with CLmax. Focus is placed on oscillations with dimensionless amplitude and frequency that extend well into the range of CL values that are unattainable for static tests even at higher Re. A comparison with unsteady theory (Theodorsen18) is very good for the lower angle of attack (10 degrees), but unwarranted at the higher angle (12 degrees) as nonlinear effects become prominent. The lower angle of attack is also supported by CFD which reveals more detailed information on the laminar separation bubble near the leading edge and turbulent flow downstream.",
author = "Christoph Mertens and Stephen Pineda and Mark Agate and Jesse Little and Hermann Fasel and Andreas Gross",
note = "Funding Information: This work has been supported by the U.S. Air Force Office of Scientific Research (FA9550-14-1-0184) and the Department of Aerospace and Mechanical Engineering at the University of Arizona. The authors wish to thank Prof. Parviz Nikravesh for assistance with the theoretical design of the plunging mechanism and Bob Perry for assistance with construction of the airfoil model. Special recognition is offered to David Dones for assistance with the mechanical design and fabrication of the oscillatory plunging mechanism and the X-56A airfoil model. The authors also wish to thank Dale Drew and Lane Hammond for their assistance. Finally, the helpful discussions with Shirzad Hosseinverdi are appreciated Publisher Copyright: {\textcopyright} 2016, American Institute of Aeronautics and Astronautics Inc, AIAA . All rights reserved.; 54th AIAA Aerospace Sciences Meeting, 2016 ; Conference date: 04-01-2016 Through 08-01-2016",
year = "2016",
doi = "10.2514/6.2016-2073",
language = "English (US)",
isbn = "9781624103933",
series = "54th AIAA Aerospace Sciences Meeting",
publisher = "American Institute of Aeronautics and Astronautics Inc, AIAA",
booktitle = "54th AIAA Aerospace Sciences Meeting",
}