Williams, David R. and Tadmor, Gilead and Colonius, Tim and Kerstens, Wesley and Quach, Vien and Buntain, Seth (2009) Lift Response of a Stalled Wing to Pulsatile Disturbances. AIAA Journal, 47 (12). pp. 3031-3037. ISSN 0001-1452 http://resolver.caltech.edu/CaltechAUTHORS:20091223-094524380
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The transient lift response of a low-Reynolds-number wing subjected to small amplitude pulsatile disturbances is investigated. The wing has a small aspect ratio and a semicircular planform, and it is fully stalled at a 20 deg angle of attack. Microvalve actuators distributed along the leading edge of the wing produce the transient disturbance. It is shown that the lift response to a single pulse increases with increasing actuator supply pressure and that the lift response curves are similar to each other when scaled by the total impulse. Furthermore, for fixed actuator supply pressure, the amplitude and total impulse of the transient lift response curve increases with increasing external flow speed. In this case, the lift response curves are similar when scaled by the dynamic pressure. The lift response to a single pulse can be treated as a filter kernel, and it can be used to predict the lift time history for the arbitrary actuator input signals. The kernel is similar in shape to transient measurements obtained by other investigators on two-dimensional wings and flaps. Comparisons between the model predictions and the experiments using multiple pulse inputs and square-wave modulated input signals at low frequencies are presented.
|Additional Information:||Copyright © 2009 by David R. Williams. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Received 12 May 2009; revision received 12 September 2009; accepted for publication 16 September 2009. We gratefully acknowledge the support of the U.S. Air Force Office of Scientific Research under the Multidisciplinary University Research Initiative FA9550-05-0369 and program manager Fariba Fahroo. D.Williams acknowledges partial support by the Alexander von Humboldt Stiftung, enabling preparation of this paper. The advice from Rudibert King of the Technische Universität Berlin is also acknowledged. Partial support for W. Kerstens and S. Buntain from the Illinois Space Grant Consortium is acknowledged.|
|Official Citation:||Lift Response of a Stalled Wing to Pulsatile Disturbances David Williams, Illinois Institute of Technology; Gilead Tadmor, Northeastern University; Tim Colonius, California Institute of Technology; Wesley Kerstens, Illinois Institute of Technology; Vien Quach, Illinois Institute of Technology; Seth Buntain, Illinois Institute of Technology AIAA Journal 2009 0001-1452 vol.47 no.12 (3031-3037) doi: 10.2514/1.45407|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||04 Jan 2010 19:49|
|Last Modified:||26 Dec 2012 11:39|
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