Airfoil trailing edge
Airfoil trailing edge
(OP)
Hi,
I'm trying to simulate an airfoil in Fluent, and I'm working with airfoils of the NACA 65 series, which are very thin.
The problem is that this airfoils become incredibly thin at 90% of the chord length or sooner ( < 0.8 mm of thickness), a geometry that would be impossible to fabricate.
I've been trying to engross the shape of the trailing edge, basically with a circunference of 2 mm diameter at it's end and connecting it with tangent arcs to the original airfoil. However, this aproximation is very poor since it would change the direction of the stream, and that's really important in my project.
I've included an ilustrative image.
¿Does someone know a better aproxximation to this problem?
Thank you!.
I'm trying to simulate an airfoil in Fluent, and I'm working with airfoils of the NACA 65 series, which are very thin.
The problem is that this airfoils become incredibly thin at 90% of the chord length or sooner ( < 0.8 mm of thickness), a geometry that would be impossible to fabricate.
I've been trying to engross the shape of the trailing edge, basically with a circunference of 2 mm diameter at it's end and connecting it with tangent arcs to the original airfoil. However, this aproximation is very poor since it would change the direction of the stream, and that's really important in my project.
I've included an ilustrative image.
¿Does someone know a better aproxximation to this problem?
Thank you!.





RE: Airfoil trailing edge
There's a way to do it without altering the chord or the mean-line, just the thickness.
Nearly all aircraft that use NACA 6-series airfoils refer to them as "modified 6-series" in their official literature. At least some for that very reason.
STF
RE: Airfoil trailing edge
Mike Halloran
Pembroke Pines, FL, USA
RE: Airfoil trailing edge
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Airfoil trailing edge
another day in paradise, or is paradise one day closer ?
RE: Airfoil trailing edge
I too have always heard the story that the F-104 was dangerous to ground crew because of the leading edge. Apparently the LE radius was only 0.00016 inches (source not firm).
Does anybody know if this is true or just something of a myth? One of my aero books by Anderson describes them as "razor thin".
Maybe someone has some physical experience with these aircraft?
I've seen a couple of them up close and personal (no barriers around). I walked right up to one at the New England Air museum. The LE definitely had a tight radius but it didn't really come off as dangerous. Seemed like it would take some carelessness to injure yourself.
Anyway, the F-104 is another brilliant Kelly Johnson design if I remember. I love those old interceptors! Sorry for not really contributing to the question, but curiosity's got me on this one.
Keep em' Flying
"I intend to live forever, or die trying" - Groucho Marx
RE: Airfoil trailing edge
Horner, S. F., Base Drag and Thick Trailing Edges. J. A. S., p. 622, October, 1950.
STF
RE: Airfoil trailing edge
Andries