Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/143072
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dc.contributor.authorWei, Zhaoyuen_US
dc.contributor.authorNew, Tze Howen_US
dc.contributor.authorLian, Lianen_US
dc.contributor.authorZhang, Yannien_US
dc.date.accessioned2020-07-28T02:50:40Z-
dc.date.available2020-07-28T02:50:40Z-
dc.date.issued2019-
dc.identifier.citationWei, Z., New, T. H., Lian, L., & Zhang, Y. (2019). Leading-edge tubercles delay flow separation for a tapered swept-back wing at very low Reynolds number. Ocean Engineering, 181, 173-184. doi:10.1016/j.oceaneng.2019.04.018en_US
dc.identifier.issn0029-8018en_US
dc.identifier.urihttps://hdl.handle.net/10356/143072-
dc.description.abstractFlow separation characteristics for two tapered swept-back wings, one with straight leading-edge (LE) and the other with tubercled LE, were investigated in a water tunnel using time-resolved particle image velocimetry (TR-PIV) technique. The two wings were based on the SD7032 aerofoil profile, with Reynolds number Re = 1.4 × 104, close to the working condition for common underwater gliders. The LE tubercles were designed such that the amplitude decreased linearly from the wing root to wing tip, while retaining constant wavelength. Results indicate that the baseline wing shows significantly separated flow in the outboard region at pitch angle of 10° and 20°, and the flow remains attached in the inboard region due to relatively larger local Reynolds number. Implementation of LE tubercles can mitigate flow separation downstream of both troughs and peaks. At higher pitch angles, the separated flows cover most of the baseline wing surface, whereas flow remains attached downstream most of tubercle peaks. Streamwise aligned counter-rotating vortex pairs (CVPs) formed over the tubercles are significantly tilted and asymmetrical due to the sweep and amplitude difference between the two sides of tubercle. Consequently, weaker vortices in CVPs close to the wing root are rapidly dissipated, allowing the CVPs to evolve into a series of co-rotating vortices (CVs), which exerted significant impact on flow separation characteristics downstream of the tubercles.en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.language.isoenen_US
dc.relation.ispartofOcean Engineeringen_US
dc.rights© 2019 Elsevier Ltd. All rights reserved. This paper was published in Ocean Engineering and is made available with permission of Elsevier Ltd.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleLeading-edge tubercles delay flow separation for a tapered swept-back wing at very low Reynolds numberen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.identifier.doi10.1016/j.oceaneng.2019.04.018-
dc.description.versionAccepted versionen_US
dc.identifier.scopus2-s2.0-85064457908-
dc.identifier.volume181en_US
dc.identifier.spage173en_US
dc.identifier.epage184en_US
dc.subject.keywordsSD7032en_US
dc.subject.keywordsLeading-edge Tuberclesen_US
dc.description.acknowledgementThis study was supported by the National Natural Science Foundation of China (grants 11702173 and 41527901). The authors also thank Nanyang Technological University, Singapore, for providing the PIV facilities and water tunnel for the present experiments.en_US
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