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Fin Stabilization

  1. Oct 28, 2005 #1
    I am trying to work through the stability forces on rocket fins
    and understand how you need laminar flow for greater stabilization
    but i am not sure how to accurately calculate some of these
    I was told that the Reynolds Equation holds true, but uses a different cross sectional area
    what cross sectional area should be used?
    is it the leading edge?
    also how dose changing surface area effect the equation...for example over a nose cone (small diameter to larger diameter)
    thanks for any info
     
  2. jcsd
  3. Oct 28, 2005 #2

    Astronuc

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    Staff: Mentor

    Here is a nice discussion on turbulence - http://en.wikipedia.org/wiki/Turbulence

    The objective in laminar flow is to maintain more or less constant pressure in a flow field across an airfoil, otherwise the pressure various and therefore momentum would fluctuate wildly disrupting control. Significant variations in pressure differential across a control surface would cause variations in net forces normal to the direction of travel, i.e. instabilities, which can grow in magnitude in very short periods.

    This is pretty cool - supersonic laminar flow - http://www.nasa.gov/centers/dryden/history/pastprojects/F16XL2/
     
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