@FeX32
No, this will verify your Navier-Stokes solver, not your empirical model. In stalled flow, it's more a coincidence than wisdom if your CFD coincides with measurements.
CFD is not able to predict this in general, the solution is strongly dependent on the turbulence model you use. Even...
You could ask this question about any university in any discipline.
Giving you an overview of what an airplane needs is, at least in my opinion, the right thing to do.
I don't agree with MikeHalloran that you should start at the bottom. Yes, when you start working you start at the bottom, but...
Just use the drag tables from Hoerner's drag book titled "Fluid Dynamic Drag" from 1958, that will do.
Neglecting deflection (preventing that you have to calculate eventual "lift") will be conservative and realistic.
@Dan320.
It makes perfect sense, see my previous post.
What you say is not true. If I throw a stone through air at rest, there's no pressure drop moving any air, it's the stone that is moving. Any further existing pressure gradient is a local distortion caused by the presence of the stone...
how does an airfoil create lift ?
lift is created by the low pressure on the upper surface and the high pressure on the lower surface.
why ? how are these pressures created ?
By means of viscosity. The air follows the shape of the airfoil, because it sticks to it. The only way to do so is by...
Are you talking about a wing or a loose airfoil?
Every airfoil will behave slightly different, but if they're not to thick on may use some linear theories.
There are many theoretical texts on this. The drag should go quadratically with lift, while lift (before stalling) goes linear (slope...
I don't remember in which one, but in one of those classics
either:
Prandtl & Tietjens, "Applied Hydro- and Aeromechanics"
or:
Prandtl & Tietjens, "Fundamentals of Hydro- and Aeromechanics"
Not only the existence of circulation in case of lift, but also the whole proces of how it comes actually...
@vortexman:
"Euler flow solutions (inviscid but not irrotational), interestingly, have not typically required the imposition of the Kutta condition, although, since the solutions are inviscid, one might have expected that the lift could not be determined by such methods. It seems that the...
The advantages of the swept wing concept at high speeds were at first demonstrated by Busemann at some "Volta" Congress.
The publication about that is in german, viz:
Busemann, A., “Aerodynamischer Auftrieb bei Überschallgeschwindigkeit,” Proc. Volta Congr., 1935,
pp. 328-360.
I don't know...
There seem to be two editions of David Peery's "Aircraft Structures", one of the 50's and one of the 80's.
According to the reviews, the 80's edition is much worse.
Anyone who may confirm this? (Before I buy...)
Hi,
I'm looking for literature on the vortex lattice method, or prandtl's lifting line method.
This is so old now that I suppose it's freely available.
If not, an advise for a good book explaining this will do as well.
Thanks in advance,
Gerrit
Hi,
A bit of a silly question maybe, but I remeber that I've seen a picture once on the internet with a drag comparison between several kinds (shapes) of airships, which I can't find anymore.
Does anyone know about such studies and where I can find these comparisons.
I've been looking in...
Hey, sorry for my strange "answer" I was on another forum at the same time and thought the posts were going up chronologically in stead of down. Anyway, BL suction is extremely energy consuming, I suppose it's only interesting for military porposes. I'd never use it to reduce drag, because what...
