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HomeTurbineAircraftHelicopterTurbine Helicopters › Maximum RPM of a turbine - what's the limiting factor ?
01-19-2010 10:10 PM  8 years agoPost 1
iandavidson99

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Ipswich, England

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Wren state that you shouldn’t run their MW54 turbine faster than 150k RPM (possibly 160k RPM).

With this in mind my question is simply; What is the key factor limiting how fast you can run the Wren MW54 turbine (or any similar turbine for that matter) ?

Since there is only really one moving part (with a single stage turbine) I just assumed that it must be that the main bearings are only rated to 150k RPM.

However now I’m not so sure, as some of these micro turbines run at up to 250k RPM, so bearing technology can clearly handle faster RPMs

So what is the limiting factor - any thoughts?

Ian

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01-20-2010 03:08 AM  8 years agoPost 2
Rappy 60

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Paris, France

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One simple formula. f = m * a

The bigger you go, the more force that is generated on all the parts. Most limiting factors are materials. Not only are the bearings seeing those forces, but also the turbine blades and wheels.

Dale

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01-20-2010 09:15 PM  8 years agoPost 3
Héli Suisse

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Geneva Switzerland

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I would rather say and write: F = m * V2/r
where F is the centripetal force, m the mass in rotation around a center of rotation, V the linear velocity of such mass, and r the radius from the center of rotation to the center of gravity of that mass (center of mass)
You can also express the following way
F = m * w2 * r
where w is the angular rotation speed (rad/sec), the other terms remaining the same.
But basically you're right. Your formula, the second Law of Newton, is very general and usually stands for linear acceleration.

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01-21-2010 04:17 AM  8 years agoPost 4
Rappy 60

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Paris, France

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But basically you're right. Your formula, the second Law of Newton, is very general and usually stands for linear acceleration.
That's why I'm not a mechanical engineer Electronics and software are much easier

Dale

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01-24-2010 07:13 PM  8 years agoPost 5
iandavidson99

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Ipswich, England

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Many thanks to everyone for their feedback.

Darn Newton and his Laws of Motion; He's such a kill-joy!

Cheers,

Ian

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