Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/36222
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dc.contributorDepartment of Building Services Engineering-
dc.creatorWang, S-
dc.creatorZhou, Y-
dc.creatorAlam, MM-
dc.creatorYang, HX-
dc.date.accessioned2016-04-15T08:36:49Z-
dc.date.available2016-04-15T08:36:49Z-
dc.identifier.issn1070-6631 (print)-
dc.identifier.issn1089-7666 (online)-
dc.identifier.urihttp://hdl.handle.net/10397/36222-
dc.language.isoenen_US
dc.publisherAmerican Institute of Physicsen_US
dc.rights© 2014 AIP Publishing LLC.en_US
dc.rightsThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in S. Wang et al., Phys. Fluids 26, 115107 (2014) and may be found at https://dx.doi.org/10.1063/1.4901969en_US
dc.titleTurbulent intensity and Reynolds number effects on an airfoil at low Reynolds numbersen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.volume26-
dc.identifier.issue11-
dc.identifier.doi10.1063/1.4901969-
dcterms.abstractThis work investigates the aerodynamics of a NACA 0012 airfoil at the chord-based Reynolds numbers (Re-c) from 5.3 x 10(3) to 2.0 x 10(4). The lift and drag coefficients, C-L and C-D, of the airfoil, along with the flow structure, were measured as the turbulent intensity T-u of oncoming flow varies from 0.6% to 6.0%. The analysis of the present data and those in the literature unveils a total of eight distinct flow structures around the suction side of the airfoil. Four Re-c regimes, i.e., the ultra-low (< 1.0 x 10(4)), low (1.0 x 10(4)-3.0 x 10(5)), moderate (3.0 x 10(5)-5.0 x 10(6)), and high Rec (> 5.0 x 10(6)), are proposed based on their characteristics of the C-L-Re-c relationship and the flow structure. It has been observed that T-u has a more pronounced effect at lower Rec than at higher Re-c on the shear layer separation, reattachment, transition, and formation of the separation bubble. As a result, C-L, C-D, C-L/C-D and their dependence on the airfoil angle of attack all vary with T-u. So does the critical Reynolds number Re-c,Re-cr that divides the ultra-low and low Re-c regimes. It is further noted that the effect of increasing T-u bears similarity in many aspects to that of increasing Re-c, albeit with differences. The concept of the effective Reynolds number Re-c,Re-eff advocated for the moderate and high Re-c regimes is re-evaluated for the low and ultra-low Re-c regimes. The Re-c,Re-eff treats the non-zero T-u effect as an addition of Re-c and is determined based on the presently defined Re-c,Re-cr. It has been found that all the maximum lift data from both present measurements and previous reports collapse into a single curve in the low and ultra-low Re-c regimes if scaled with Re-c,Re-eff.-
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationPhysics of fluids, 2014, v. 26, no. 11, 115107, p. 115107-1-115107-25-
dcterms.isPartOfPhysics of fluids-
dcterms.issued2014-
dc.identifier.isiWOS:000345578700032-
dc.identifier.scopus2-s2.0-84912048661-
dc.identifier.rosgroupid2014004971-
dc.description.ros2014-2015 > Academic research: refereed > Publication in refereed journal-
dc.description.oaVersion of Recorden_US
dc.identifier.FolderNumberOA_IR/PIRAen_US
dc.description.pubStatusPublisheden_US
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