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Type: Journal article
Title: The leading-edge vortex on a rotating wing changes markedly beyond a certa central body size
Author: Bhat, S.S.
Zhao, J.
Sheridan, J.
Hourigan, K.
Thompson, M.C.
Citation: Royal Society Open Science, 2018; 5(7):1-16
Publisher: Royal Society
Issue Date: 2018
ISSN: 2054-5703
Statement of
Shantanu S. Bhat, Jisheng Zhao, John Sheridan, Kerry Hourigan and Mark C. Thompson
Abstract: Stable attachment of a leading-edge vortex (LEV) plays a key role in generating the high lift on rotating wings with a central body. The central body size can affect the LEV structure broadly in two ways. First, an overall change in the size changes the Reynolds number, which is known to have an influence on the LEV structure. Second, it may affect the Coriolis acceleration acting across the wing, depending on the wing-offset from the axis of rotation. To investigate this, the effects of Reynolds number and the wing-offset are independently studied for a rotating wing. The three-dimensional LEV structure is mapped using a scanning particle image velocimetry technique. The rapid acquisition of images and their correlation are carefully validated. The results presented in this paper show that the LEV structure changes mainly with the Reynolds number. The LEV-split is found to be only minimally affected by changing the central body radius in the range of small offsets, which interestingly includes the range for most insects. However, beyond this small offset range, the LEV-split is found to change dramatically.
Rights: © 2018 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.
DOI: 10.1098/rsos.172197;172197
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Mechanical Engineering publications

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