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Unformatted text preview: α The velocity field V about the airfoil is represented as a superposition of a freestream and a vortex sheet. I feel the following about this concept. 1. Very uncertain 2. Somewhat uncertain 3. Somewhat comfortable 4. Very comfortable V (s) V V V α The circulation of V 1 ( x , y ) about the circuit of perimeter s tot is 1 . A constant α V is now added to make α α V. V 2 = V 1 + α What is α V 2 ’s circulation 2 about the same circuit? 1. 2 = 1 −  α V  s tot 2.* 2 = 1 3. 2 = 1 +  α V  s tot V ds An airfoil in steady motion at speed V 1 has circulation 1 . The speed is suddenly increased to V 2 = 2V 1 . What is the circulation v of the shed vortex? 1. v = − 1 / 2 2.* v = − 1 3. v = − 2 1 V = 2V V 1 1 1 2 v = ? Initial steady motion After velocity increase A vortex sheet is placed on the x axis in a freestream V . The average V u + α xvelocity ( α V ) · ˆ ı / 2 on the sheet itself, will 1. Increase 2. Decrease 3.* Not change Which type of control surface deﬂec...
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This note was uploaded on 01/28/2012 for the course AERO 16.01 taught by Professor Markdrela during the Fall '05 term at MIT.
 Fall '05
 MarkDrela

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