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A study of separation on airfoils undergoing pitch, surge and combined motions

Dunne, R. and McKeon, B. J. (2015) A study of separation on airfoils undergoing pitch, surge and combined motions. In: 33rd AIAA Applied Aerodynamics Conference. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2015-2882. ISBN 978-1-62410-363-6. https://resolver.caltech.edu/CaltechAUTHORS:20190828-110109774

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Abstract

Vertical axis wind turbine blades undergo a large angle of attack and velocity variation during every turbine rotation. The flow over a NACA 0018 airfoil undergoing sinusoidal pitch, surge and combined motions at similar frequency, amplitude and Reynolds number as a commercial turbine was measured to investigate the effect of the different motions on the flow field. Two-dimensional, time resolved velocity fields were acquired using particle image velocimetry. Vorticity contours of the phase-averaged flow were used to visualize the separation process and shear layer development. The pitch-only ease is seen to separate earlier and at a lower angle of attack than the combined case. Results for surging airfoils at two angles of attack are presented, one fully separated, and one partially separated. Surge forward is shown to move the separation point toward the leading edge, while surge back moved it aft. The dynamics of the leading edge vortex in the combined pitch/surge and pitch motions are discussed.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2015-2882DOIArticle
ORCID:
AuthorORCID
McKeon, B. J.0000-0003-4220-1583
Additional Information:© 2015 American Institute of Aeronautics and Astronautics. Published Online: 19 Jun 2015.
Group:GALCIT
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2015-2882
Record Number:CaltechAUTHORS:20190828-110109774
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190828-110109774
Official Citation:A study of separation on airfoils undergoing pitch, surge and combined motions. Reeve Dunne and Beverley J. McKeon. 33rd AIAA Applied Aerodynamics Conference. June 2015. https://doi.org/10.2514/6.2015-2882
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98315
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Aug 2019 18:15
Last Modified:03 Oct 2019 21:39

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