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Experiments in Fluids

, Volume 50, Issue 1, pp 23–34 | Cite as

Vortical structures on a flapping wing

  • C. A. Ozen
  • D. Rockwell
Research Article

Abstract

A wing in the form of a rectangular flat plate is subjected to periodic flapping motion. Space–time imaging provides quantitative representations of the flow structure along the wing. Regions of spanwise flow exist along the wing surface; and depending on the location along the span, the flow is either toward or away from the tip of the wing. Onset and development of large-scale, streamwise-oriented vortical structures occur at locations inboard of the tip of the wing, and they can attain values of circulation of the order of one-half the circulation of the tip vortex. Time-shifted images indicate that these streamwise vortical structures persist over a major share of the wing chord. Space–time volume constructions define the form and duration of these structures, relative to the tip vortex.

Keywords

Vortex Vorticity Particle Image Velocimetry Vortical Structure Lead Edge Vortex 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. Aono H, Liang F, Liu H (2008) Near- and far-field aerodynamics in insect hovering flight: an integrated computational study. J Exp Biol 211:239–257CrossRefGoogle Scholar
  2. Birch JM, Dickinson MH (2003) The influence of wing-wake interactions on the production of aerodynamic forces in flapping flight. J Exp Biol 206:2257–2272CrossRefGoogle Scholar
  3. Birch JM, Dickson WB, Dickinson MH (2004) Force production and flow structure of the leading-edge vortex on flapping wings at high and low reynolds numbers. J Exp Biol 207(7):1063–1072CrossRefGoogle Scholar
  4. Bomphrey RJ, Taylor GK, Thomas ALR (2009) Smoke visualization of free-flying bumblebees indicates independent leading-edge vortices on each wing pair. Exp Fluids 46:811–821CrossRefGoogle Scholar
  5. Dickinson MH, Lehmann FO, Sane SP (1999) Wing rotation and the aerodynamic basis of insect flight. Science 284:1954–1960CrossRefGoogle Scholar
  6. Dudley R, Ellington CP (1990a) Mechanics of forward flight in bumblebees : I. Kinematics and morphology. J Exp Biol 148:19–52Google Scholar
  7. Dudley R, Ellington CP (1990b) Mechanics of forward flight in bumblebees: II. Quasi-steady lift and power requirements. J Exp Biol 148:53–88Google Scholar
  8. Ellington CP (1984) The aerodynamics of hovering insect flight: III. Kinematics. Philos Trans R Soc Lond Ser B Biol Sci 305(1122):41–78CrossRefGoogle Scholar
  9. Fry SN, Sayaman R, Dickinson MH (2003) The aerodynamics of free-flight maneuvers in Drosophila. Science 300:495–498CrossRefGoogle Scholar
  10. Lehmann FO (2004) The mechanisms of lift enhancement in insect flight. Naturwissenschaften 91:101–122CrossRefGoogle Scholar
  11. Lentink D, Dickinson MH (2009a) Biofluiddynamic scaling of flapping, spinning and translating fins and wings. J Exp Biol 212:2691–2704CrossRefGoogle Scholar
  12. Lentink D, Dickinson MH (2009b) Rotational accelerations stabilize leading edge vortices on revolving fly wings. J Exp Biol 212:2705–2719CrossRefGoogle Scholar
  13. Liu H, Ellington CP, Kawachi K, van den Berg C, Willmott AP (1998) A computational fluid dynamic study of hawkmoth hovering. J Exp Biol 201:461–477Google Scholar
  14. Poelma C, Dickson WB, Dickinson MH (2006) Time-resolved reconstruction of the full velocity field around a dynamically-scaled flapping wing. Exp Fluids 41:213–225CrossRefGoogle Scholar
  15. Sane SP (2003) The aerodynamics of insect flight. J Exp Biol 206:4191–4208CrossRefGoogle Scholar
  16. Shyy W, Lian Y, Tang J, Liu H, Trizila P, Stanford P, Bernal L, Cesnik C, Friedmann P, Ifju P (2008) Computational aerodynamics of low Reynolds number plunging, pitching and flexible wings for MAV applications. Acta Mech Sin 24:351–373CrossRefGoogle Scholar
  17. Sun M, Tang J (2002) Unsteady aerodynamic force generation by a model fruit fly wing in flapping motion. J Exp Biol 205:55–70Google Scholar
  18. van den Berg C, Ellington CP (1997a) The vortex wake of a ‘hovering’ model hawkmoth. Philos Trans R Soc Lond Ser B Biol Sci 352:317–328CrossRefGoogle Scholar
  19. van den Berg C, Ellington CP (1997b) The three-dimensional leading-edge vortex of a ‘hovering’ model hawkmoth. Philos Trans R Soc Lond Ser B Biol Sci 352:329–340CrossRefGoogle Scholar
  20. Viieru D, Tang J, Lian Y, Liu H, Shyy W (2006) Flapping and flexible wing aerodynamics of low Reynolds number flight vehices. 44th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NevadaGoogle Scholar
  21. Wang ZJ (2000) Two dimensional mechanisms for insect hovering. Phys Rev Lett 85:2216–2218CrossRefGoogle Scholar
  22. Wang ZJ (2005) Dissecting insect flight. Annu Rev Fluid Mech 35:183–210CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Mechanical Engineering and Mechanics, Lehigh UniversityBethlehemUSA

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