|
[Sponsors] |
January 5, 2004, 05:51 |
supersonic airfoils
|
#1 |
Guest
Posts: n/a
|
why does a little camber create no lift on supersonic airfoils with contrast to subsonic ones.(please explain physically)
|
|
January 5, 2004, 09:21 |
Re: supersonic airfoils
|
#2 |
Guest
Posts: n/a
|
Because you are dealing with 2 different mechanisms of lift generation. In the subsonic case all of the lift can be related back to the vorticity generated at the airfoil surface. With a symmetric airfoil at zero angle of attack the net vorticity generated is zero, hence zero lift. Add in a slight asymmetry via camber and the net vorticity generation is no longer zero and you have lift. With a supersonic airfoil the principal lift mechanism is the pressure difference created by shock asymmetry. This is why most supersonic airfoils have sharp edges (a no-no in low subsonic flows). Camber will still have an effect in supersonic flow, but the effect is so small as to be ignored.
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Probelm with supersonic exhaust to ambient | newj | CFX | 2 | August 9, 2012 18:01 |
Flow in Supersonic MHD Channel | Antanas | CFX | 6 | February 13, 2012 14:49 |
multiple airfoils at once, are they affected? | kdrbrk | FLUENT | 0 | October 18, 2010 05:31 |
CFD code for supersonic flows | hedy | Main CFD Forum | 9 | April 16, 2007 10:56 |
linearized supersonic flow on airfoils | kharati | Main CFD Forum | 1 | January 7, 2004 07:08 |