Three-Dimensionality Effects due to Change in the Aspect Ratio for the Flow around an Impulsively Pitching Flat Plate
Publication: Journal of Aerospace Engineering
Volume 30, Issue 5
Abstract
Three-dimensionality effects have been investigated for a flat plate undergoing an impulsive pitch-up motion in a large-scale, free-surface water channel with the presence and absence of an endplate to represent a symmetry plane and to prevent free-surface effects. To obtain the same aspect ratios without using the endplate, appropriately sized wings were also used in a fully submerged arrangement. The velocity fields were acquired in the near wake of the flat plate using a two-dimensional (2D) two-component digital particle image velocimetry system, and simultaneous force measurements were performed. The wing had an aspect ratio ranging from 2 to 8 and pitches up to 45° in 1 or 6 convective times. The force measurement results revealed that major difference occurred after the motion was completed in which the lift and drag forces exhibited a local increase and decrease. Interactions between leading edge, trailing edge, and tip vortices were investigated; flow structures were correlated with the force-time histories, and variations with aspect ratio were also addressed.
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Acknowledgments
The study is funded by the Scientific and Technological Research Council of Turkey (TUBITAK) Grant 112M682. The authors also acknowledge insightful comments and valuable inputs of NATO-STO-AVT 202 team’s cochairs and contributors.
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Published In
Journal of Aerospace Engineering
Volume 30 • Issue 5 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Sep 29, 2016
Accepted: Mar 14, 2017
Published online: Jun 14, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 14, 2017
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