NDLI: The force and impulse of a flapping plate performing advancing and returning strokes in a quiescent fluid

Content Provider	Springer Nature Link
Author	DeVoria, Adam C. Ringuette, Matthew J.
Copyright Year	2013
Abstract	Force measurements are conducted on a low-aspect-ratio ( ) trapezoidal flat plate that rotates at 90° angle of attack and performs an advancing stroke from rest followed by a returning stroke. The parameters varied are the rotational amplitude of the motion and the rest time between the advancing and returning strokes. The unsteady normal forces track with the angular acceleration of the plate, with the added mass force peak in the returning stroke being larger than that in the advancing stroke. However, as the rest time is increased, the normal forces generated in each stroke become dynamically similar. The maximum total impulse is calculated from the force measurements and rapidly decays from its largest value at zero rest time and asymptotes to a constant with increased rest time. The direction of this impulse is also calculated and quickly approaches the direction about which the plate motion is symmetric. The largest additional impulse contribution obtained from executing a returning stroke within a finite time is approximately 18 %. Increases in rotational amplitude initially increase the maximum total impulse, but it then plateaus at an amplitude of around 90°. For nonzero rest times, any maxima of the impulse in a fixed direction are weak and necessarily reduced from the maximum possible impulse. For a nearly 100° range of directions, the impulse is largest for rotational amplitudes between 75° and 90°. The results are also applied to three types of propulsive configurations.
Starting Page	1
Ending Page	15
Page Count	15
File Format	PDF
ISSN	07234864
Journal	Experiments in Fluids
Volume Number	54
Issue Number	5
e-ISSN	14321114
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-04-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Fluid Dynamics Fluid- and Aerodynamics Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Fluid Flow and Transfer Processes Physics and Astronomy Mechanics of Materials Computational Mechanics

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