Drag coefficient of NACA airfoils

L3munoz · April 22, 2009, 08:12

Hi!

I didn't know if this was the best place to ask that...Anyway..

I'm trying to make a simple design optimization study of drag coefficient of a NACA airfoil, but since there are so many and i'm not used to work with them i didnt know which one to choose. My idea is to take one which has a CD as high as possible, in order to see better an improvement on design to decrease the drag. Any idea??

I really need help to start the study asap...so any advice is welcome...

Thanks in advance,

Jorge.

praveen · April 22, 2009, 10:20

Are you doing inviscid or viscous ? If inviscid, try the standard RAE2822 test case. You can reduce the drag by about 70% under lift constraint. Same test case might be good for viscous too.

L3munoz · April 23, 2009, 12:50

Hi! thanks for answering so fast. I'm gonna study both cases...So do u suggest me using RAE2822...but is it a NACA one?

praveen · April 23, 2009, 12:52

See

http://www.grc.nasa.gov/WWW/wind/val...af/raetaf.html

April 22, 2009, 08:12	Drag coefficient of NACA airfoils	#1
L3munoz Member Jorge Muñoz Join Date: Apr 2009 Posts: 56 Rep Power: 17	Hi! I didn't know if this was the best place to ask that...Anyway.. I'm trying to make a simple design optimization study of drag coefficient of a NACA airfoil, but since there are so many and i'm not used to work with them i didnt know which one to choose. My idea is to take one which has a CD as high as possible, in order to see better an improvement on design to decrease the drag. Any idea?? I really need help to start the study asap...so any advice is welcome... Thanks in advance, Jorge.

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April 22, 2009, 10:20		#2
praveen Super Moderator Praveen. C Join Date: Mar 2009 Location: Bangalore Posts: 343 Blog Entries: 6 Rep Power: 18	Are you doing inviscid or viscous ? If inviscid, try the standard RAE2822 test case. You can reduce the drag by about 70% under lift constraint. Same test case might be good for viscous too.

April 23, 2009, 12:50		#3
L3munoz Member Jorge Muñoz Join Date: Apr 2009 Posts: 56 Rep Power: 17	Hi! thanks for answering so fast. I'm gonna study both cases...So do u suggest me using RAE2822...but is it a NACA one?

April 23, 2009, 12:52		#4
praveen Super Moderator Praveen. C Join Date: Mar 2009 Location: Bangalore Posts: 343 Blog Entries: 6 Rep Power: 18	See http://www.grc.nasa.gov/WWW/wind/val...af/raetaf.html