Centrifugal force on rotating blades

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Discussion Overview

The discussion centers on calculating the centrifugal force acting on airfoil blades that are rotating at a constant angular speed. Participants explore methods for determining the forces at the blade root, considering factors such as the center of mass and the implications of a constant cross-section.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Experimental/applied

Main Points Raised

  • One participant seeks clarification on how to calculate the centrifugal force on the blade root due to constant angular speed, mentioning confusion regarding the 'centre of gyration'.
  • Another participant suggests calculating the average force throughout the blade and multiplying it by the blade length to find the total force at the root.
  • A different participant proposes estimating the center of mass position and treating the forces at the root as if the mass were concentrated at the mass center, using the formula CF = Mass.Omega^2.Radius.
  • A later post introduces a different topic regarding a "Maximum regulating test" performed on axial fans, asking for explanations about the test and its execution.

Areas of Agreement / Disagreement

Participants present various methods for calculating centrifugal force, indicating a lack of consensus on the best approach. Additionally, the introduction of a different topic regarding axial fans suggests that the discussion is not fully resolved on the original question.

Contextual Notes

Participants do not clarify assumptions regarding the distribution of mass along the blade or the specific conditions under which the centrifugal force is calculated. The relevance of the center of gyration is not fully explored.

wisemo
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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
 
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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.
 

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