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prs01_10

# prs01_10 - The velocity eld V about the airfoil is...

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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

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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±

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A vortex sheet is placed on the x axis in a freestream V . The average V u + α x-velocity ( α V ) · ˆ ı / 2 on the sheet itself, will 1. Increase 2. Decrease 3.* Not change
Which type

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