Influence of Turbulence on Cambered and Symmetrical Airfoils at Low Reynolds Numbers

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dc.contributor.author Kay, NJ
dc.contributor.author Richards, PJ
dc.contributor.author Sharma, RN
dc.date.accessioned 2021-10-20T01:44:43Z
dc.date.available 2021-10-20T01:44:43Z
dc.date.issued 2020
dc.identifier.citation AIAA Journal 58(5):1913-1925 01 May 2020
dc.identifier.issn 1533-385X
dc.identifier.uri https://hdl.handle.net/2292/57044
dc.description.abstract Small unmanned aerial vehicles (UAVs) are becoming more common as electronic systems decrease in size and weight. These aircraft fly below a Reynolds number of 250,000, where, in clean flow, the wing boundary layer undergoes laminar-to-turbulent transition for a significant portion of the wing chord. However, many UAVs fly at low altitude, where significant levels of turbulence are encountered due to terrain roughness. The present study was carried out to understand how this turbulent flow changes the performance of the UAV wing—in particular, how this influence may vary with the camber of the airfoil form. Two airfoils, a NACA0012 and a NACA4412, were tested in relatively clean and highly turbulent flows in a wind tunnel. Testing was conducted at Reynolds numbers of 50,000–200,000, with turbulence intensities from 1.3 to 15%. Under increasing turbulence intensities, in contrast to prior flat plate research, the maximum lift coefficient was seen to decrease by up to 30% for the cambered airfoil, compared with a 5% rise for the symmetrical form. The influence of the Reynolds number on both airfoils decreased as the turbulence intensity increased, whereas camber maintained a point of difference.
dc.language en
dc.publisher American Institute of Aeronautics and Astronautics
dc.relation.ispartofseries AIAA Journal
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher.
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm
dc.rights.uri https://www.aiaa.org/publications/books/Publication-Policies#AIAA_Author_Rights_and_Responsibilities:_Self-Archiving_and_Posting_Policy
dc.subject Science & Technology
dc.subject Technology
dc.subject Engineering, Aerospace
dc.subject Engineering
dc.subject LOW-ASPECT-RATIO
dc.subject FREESTREAM TURBULENCE
dc.subject SEPARATION BUBBLE
dc.subject BOUNDARY-LAYER
dc.subject FLOW
dc.subject WINGS
dc.subject AERODYNAMICS
dc.subject 0901 Aerospace Engineering
dc.subject 0905 Civil Engineering
dc.subject 0913 Mechanical Engineering
dc.title Influence of Turbulence on Cambered and Symmetrical Airfoils at Low Reynolds Numbers
dc.type Journal Article
dc.identifier.doi 10.2514/1.J058822
pubs.issue 5
pubs.volume online first
dc.date.updated 2021-09-10T02:30:04Z
dc.rights.holder Copyright: The author en
pubs.author-url http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000538778800003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=6e41486220adb198d0efde5a3b153e7d
pubs.publication-status Published
dc.rights.accessrights http://purl.org/eprint/accessRights/OpenAccess en
pubs.subtype Article
pubs.elements-id 795778
dc.identifier.eissn 1533-385X
pubs.online-publication-date 2019-12-24


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