Leading-edge vortices over swept-back wings with varying sweep geometries
Micro air vehicles are used in a myriad of applications, such as transportation and surveying. Their performance can be improved through the study of wing designs and lift generation techniques including leading-edge vortices (LEVs). Observation of natural fliers, e.g. birds and bats, has shown that...
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ftpubmed:oai:pubmedcentral.nih.gov:6689613 2023-05-15T14:17:16+02:00 Leading-edge vortices over swept-back wings with varying sweep geometries Lambert, William B. Stanek, Mathew J. Gurka, Roi Hackett, Erin E. 2019-07-10 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6689613/ https://doi.org/10.1098/rsos.190514 en eng The Royal Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6689613/ http://dx.doi.org/10.1098/rsos.190514 © 2019 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. CC-BY Engineering Text 2019 ftpubmed https://doi.org/10.1098/rsos.190514 2019-08-18T00:52:22Z Micro air vehicles are used in a myriad of applications, such as transportation and surveying. Their performance can be improved through the study of wing designs and lift generation techniques including leading-edge vortices (LEVs). Observation of natural fliers, e.g. birds and bats, has shown that LEVs are a major contributor to lift during flapping flight, and the common swift (Apus apus) has been observed to generate LEVs during gliding flight. We hypothesize that nonlinear swept-back wings generate a vortex in the leading-edge region, which can augment the lift in a similar manner to linear swept-back wings (i.e. delta wing) during gliding flight. Particle image velocimetry experiments were performed in a water flume to compare flow over two wing geometries: one with a nonlinear sweep (swift-like wing) and one with a linear sweep (delta wing). Experiments were performed at three spanwise planes and three angles of attack at a chord-based Reynolds number of 26 000. Streamlines, vorticity, swirling strength, and Q-criterion were used to identify LEVs. The results show similar LEV characteristics for delta and swift-like wing geometries. These similarities suggest that sweep geometries other than a linear sweep (i.e. delta wing) are capable of creating LEVs during gliding flight. Text Apus apus PubMed Central (PMC) Royal Society Open Science 6 7 190514 |
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Engineering Lambert, William B. Stanek, Mathew J. Gurka, Roi Hackett, Erin E. Leading-edge vortices over swept-back wings with varying sweep geometries |
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Engineering |
description |
Micro air vehicles are used in a myriad of applications, such as transportation and surveying. Their performance can be improved through the study of wing designs and lift generation techniques including leading-edge vortices (LEVs). Observation of natural fliers, e.g. birds and bats, has shown that LEVs are a major contributor to lift during flapping flight, and the common swift (Apus apus) has been observed to generate LEVs during gliding flight. We hypothesize that nonlinear swept-back wings generate a vortex in the leading-edge region, which can augment the lift in a similar manner to linear swept-back wings (i.e. delta wing) during gliding flight. Particle image velocimetry experiments were performed in a water flume to compare flow over two wing geometries: one with a nonlinear sweep (swift-like wing) and one with a linear sweep (delta wing). Experiments were performed at three spanwise planes and three angles of attack at a chord-based Reynolds number of 26 000. Streamlines, vorticity, swirling strength, and Q-criterion were used to identify LEVs. The results show similar LEV characteristics for delta and swift-like wing geometries. These similarities suggest that sweep geometries other than a linear sweep (i.e. delta wing) are capable of creating LEVs during gliding flight. |
format |
Text |
author |
Lambert, William B. Stanek, Mathew J. Gurka, Roi Hackett, Erin E. |
author_facet |
Lambert, William B. Stanek, Mathew J. Gurka, Roi Hackett, Erin E. |
author_sort |
Lambert, William B. |
title |
Leading-edge vortices over swept-back wings with varying sweep geometries |
title_short |
Leading-edge vortices over swept-back wings with varying sweep geometries |
title_full |
Leading-edge vortices over swept-back wings with varying sweep geometries |
title_fullStr |
Leading-edge vortices over swept-back wings with varying sweep geometries |
title_full_unstemmed |
Leading-edge vortices over swept-back wings with varying sweep geometries |
title_sort |
leading-edge vortices over swept-back wings with varying sweep geometries |
publisher |
The Royal Society |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6689613/ https://doi.org/10.1098/rsos.190514 |
genre |
Apus apus |
genre_facet |
Apus apus |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6689613/ http://dx.doi.org/10.1098/rsos.190514 |
op_rights |
© 2019 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1098/rsos.190514 |
container_title |
Royal Society Open Science |
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6 |
container_issue |
7 |
container_start_page |
190514 |
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1766289145362120704 |