The Myth of Aspect Ratio

Discussion in 'Hydrodynamics and Aerodynamics' started by DCockey, Feb 20, 2011.

  1. daiquiri
    Joined: May 2004
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    I think I'm losing the grip on what is being discussed here - is it that Keuning was (evidently) wrong? An informed NA or BD will surely not base his design decisions only on cited Keuning's text (which I have ignored till now, by the way), but will have multiple (and hopefully more knowledgeable) sources to learn from.

    What is being said here is basics of hydro/aerodynamics, and I have taken these things as obvious. But perhaps I was wrong - maybe it was really necessary to stress these concepts out. In that case, cheers for a good and informative thread.
     
  2. Mikko Brummer
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    Mikko Brummer Senior Member

    And this applies for sails as well... since lift is limited by stability (usually starting with 10 kn of wind or so), parasitic drag grows in importance quickly when wind increases.
     
  3. Leo Lazauskas
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    Leo Lazauskas Senior Member

    I dug up another reference that might suit your N-S solver better than the circular wing at high Rn.

    Taira, Kunihiko and Colonius, Tim,
    "Three-dimensional flows around low-aspect-ratio flat-plat wings at low Reynolds numbers",
    J. Fluid Mechanics, vol. 623, 2009, pp.-187-209.

    This paper's main focus is on thin rectangular wings with AR=2.0 and 4.0 at Rn=300 and 500. They also look a little at delta and elliptical wings.

    Leo.
     

  4. yipster
    Joined: Oct 2002
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    yipster designer

    some more but older papers on delta's
    aerade.cranfield.ac.uk/ara/arc/cp/1129.pdf
    ntrs.nasa.gov/archive/nasa/casi.../19670003842_1967003842.pdf
     
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