CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

supersonic airfoils

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   January 5, 2004, 06:51
Default supersonic airfoils
  #1
kharati
Guest
 
Posts: n/a
why does a little camber create no lift on supersonic airfoils with contrast to subsonic ones.(please explain physically)
  Reply With Quote

Old   January 5, 2004, 10:21
Default Re: supersonic airfoils
  #2
ag
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.
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


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 15:49
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 08:08


All times are GMT -4. The time now is 15:32.