Machine-translated by Google. Questions are authored in English.
Top

Discussion

The circulation distribution on a wing must fall to zero at the tips because

  • A.The chord is always zero at the tip
  • B.The free-stream velocity vanishes at the tip
  • C.The Kutta condition applies only at the tips
  • D.The pressure difference between the surfaces cannot be sustained there

Answer: D

At the tip the upper and lower surfaces open to the same body of air, so no pressure difference can be maintained and the local lift, and with it the circulation, must vanish. This holds whatever the tip chord happens to be. It is the boundary condition that the sine series in lifting-line theory is built to satisfy automatically.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.