Approximating pressure on fan blade for static FEM

[jt2001]

Hello,

I have a fan hub I am looking to get an idea of the stresses it is under.

Is there a way of appoximating the force normal to the surface given:
- Air/medium density
- Radial velocity
- Fanblade geometery


Kind regards,

JT

 

[rb1957]

greg,

why would lift be related to centrifugal force ?
why would lift not involve the density of air ?

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[GregLocock]

It is and it isn't, Both are functions of v^2 as it happens. So centrifugal force is m*v^2/r and lift is 1/2*Cl*rho*A*v^2, where v=w*r

Why both forces are proportional to v^2 is, I suspect, because both effects are inertial, but I'm not sure that is a great explanation.

rho is 1.2

Cheers

Greg Locock


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