Centrifugal force on rotating blades

AI Thread Summary
To calculate the centrifugal force on airfoil blades at constant angular speed, determine the average force along the blade and multiply it by the blade length to find the total force at the root. This can be simplified by estimating the center of mass and treating the forces as concentrated at that point, using the formula CF = Mass × Omega² × Radius. The discussion also mentions a "Maximum regulating test" for axial fans, which has a limit of +/- 15,000 kilo-pounds, though details on its execution are sought. Understanding these calculations and tests is crucial for assessing blade performance under rotational forces. The conversation highlights the importance of accurately determining forces in rotating systems.
wisemo
Messages
7
Reaction score
0
Hi everyone,

I've got a set of airfoil blades here which are homogenious and have a constant profile (x-section). Each blade is of equal length (as should be).
What would the best way be to calculate the centrifugal force on the blade root as a result of constant angular speed? say o - rads/s

I've just gotten a little confused about involving the 'centre of gyration'.

thanks

mo
 
Physics news on Phys.org
If you can calculate the average force throughout the blade, and multiply by the length of the blade, that will give you the total force, all of which is felt at the root of the blade.
 
Easy, since blade is constant section, estimate the centre of mass position and treat the root forces/stresses as if the mass was concentrated at the mass centre - ie CF = Mass.Omega^2.Radius.
 
I have recently came across a test - "Maximum regulating test" with a limit of +/- 15000 kilo-pound been performed on axial fans. Can anyone explain me what this test is all about & how it is performed.
Thanks in advance.
 

Thread '1:1 versus 2:1 Mechanical Advantage debate'

The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
View full post »

Thread 'Newton's first law?'

Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
View full post »
Thread 'Beam on an inclined plane'

Thread 'Beam on an inclined plane'

Hello! I have a question regarding a beam on an inclined plane. I was considering a beam resting on two supports attached to an inclined plane. I was almost sure that the lower support must be more loaded. My imagination about this problem is shown in the picture below. Here is how I wrote the condition of equilibrium forces: $$ \begin{cases} F_{g\parallel}=F_{t1}+F_{t2}, \\ F_{g\perp}=F_{r1}+F_{r2} \end{cases}. $$ On the other hand...
View full post »

Similar threads

What is the difference between centrifugal and centripetal forces?
Replies
17
Views
13K
Is Centrifugal Force Real or Fictitious?
Replies
1
Views
2K
Rectilinear movement seen from a rotating reference frame
Replies
17
Views
2K
A Modeling the damping of a physical rigid pendulum
Replies
1
Views
2K
Question on hoop stress tension in rotating objects
Replies
35
Views
5K
Centrifugal Force load caused from propeller rotation
Replies
2
Views
2K
What Causes Imbalance in Rotating Bodies?
Replies
4
Views
2K
Centripetal and Centrifugal Acceleration.
Replies
11
Views
5K
Pumping fluid against a centrifugal force
Replies
1
Views
3K
Angular momentum is conserved, but KE is not. How to find out why?
Replies
6
Views
4K

Hot Threads

Recent Insights

Back
Top