50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition 2012
DOI: 10.2514/6.2012-912
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Abstract: We investigate experimentally the effect of aspect ratio (AR) on the unsteady, threedimensional vortex structure of low-AR, flat-plate wings rotating from rest with a 45 angle of attack. This configuration is a simplified model of a flapping-wing hovering half-stroke. The objectives are to quantitatively characterize the evolution of the detailed, threedimensional vortex structure and its variation with AR. The experiments are conducted in a glass tank facility containing a mixture of glycerin and water. Plat… Show more

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Cited by 23 publications
(26 citation statements)
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References 81 publications
(62 reference statements)
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“…In particular, the simulations reveal that the leading-edge vortex is initially pinned to the blade near the intersection of the tip and the leading edge, but later tilts into the streamwise direction and combines with the tip vortex. A similar structure was presented by Carr et al (2012), who showed that vortex breakdown was more likely to occur for larger aspect ratios when chord Reynolds number based on the tip velocity was held constant.…”
Section: Introductionsupporting
confidence: 55%
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“…In particular, the simulations reveal that the leading-edge vortex is initially pinned to the blade near the intersection of the tip and the leading edge, but later tilts into the streamwise direction and combines with the tip vortex. A similar structure was presented by Carr et al (2012), who showed that vortex breakdown was more likely to occur for larger aspect ratios when chord Reynolds number based on the tip velocity was held constant.…”
Section: Introductionsupporting
confidence: 55%
“…Whereas the vorticity distribution is compact at b/s = 0.25, it extends over the entire chord at b/s = 0.50 due to the chordwise tilting and breakdown of the structure at this spanwise location, as documented by Carr et al (2012) and Garmann, Visbal & Orkwis (2013a). Although we only discuss the development of the leading-edge vortex at azimuthal positions within the first rotation in this paper, data were acquired up to 10 rotations of the blade, and a similarly-attached vortex was observed in all cases.…”
Section: Resultsmentioning
confidence: 95%
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“…Sectional imaging involving either chordwise or spanwise planes, or a combination of them, has been used by Birch & Dickinson (2001), Birch, Dickson & Dickinson (2004), Ansari et al (2009), Jones, Ford & Babinsky (2011, Ozen & Rockwell (2012) and Wojcik & Buchholz (2012). Volume imaging with interpretation of selected sections has been employed by Liu et al (1998), Poelma, Dickson & Dickinson (2006), Aono, Liang & Liu (2008), Lu & Shen (2008), Kim & Gharib (2010) and Carr et al (2012). These investigations extend over a wide range of Reynolds number, and reveal a number of important phenomena, including a coherent and stable (LEV), possible occurrence of vortex breakdown, the distribution and magnitude of spanwise velocity and the history of the lift acting on the wing.…”
Section: Introductionmentioning
confidence: 99%