Three-dimensional bluff body aerodynamics and its importance for helicopter sling loads

dc.contributor.author Prosser, D.T.
dc.contributor.author Smith, M.J.
dc.date.accessioned 2016-12-16T15:14:39Z
dc.date.available 2016-12-16T15:14:39Z
dc.date.issued 2014
dc.description.abstract Fundamental three-dimensional aerodynamic phenomena have been investigated for small-aspect-ratio rectangular prisms and circular cylinders, canonical bluff body geometries representative of typical helicopter sling loads. A detailed identification and quantification of the unsteady aerodynamic phenomena at differing orientation angles associated with instabilities has been undertaken. The numerical experiments indicate that shear layer reattachment is the primary factor in determining the mean forces and moments of the bluff bodies. Many characteristics of the shear layer behavior are similar for the three-dimensional bluff bodies and, in some cases, similar to two-dimensional behavior extant in the literature. Differences in the canonical shape and aspect ratios occur and are quantified with varying reattachment distances as the orientation changes. Strouhal numbers vary in the range from 0.15–0.3 and exhibited a highly threedimensional, multimodal nature at the Reynolds numbers investigated. These findings are significant for the development of reduced-order aerodynamic modeling of sling loads.
dc.identifier.other 31-B-paper
dc.identifier.uri http://hdl.handle.net/20.500.11881/3494
dc.language.iso en
dc.title Three-dimensional bluff body aerodynamics and its importance for helicopter sling loads
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