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Anyone know a turbine engineer? - Page 3

post #21 of 35
Thread Starter 

 

Quote:
Originally Posted by tony_choi View Post

Hi, ehume

I just replied you message. smile.gif
 

 

Thanks. +rep

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post #22 of 35
post his reply! I wanna know too.
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post #23 of 35
Thread Starter 

I will let Mr. Choi "speak" for himself, as we have not discussed permission to repost his message.

 

In the mean time, did I post this? And this?

 

G'night guys. See you tomorrow evening.

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post #24 of 35
Hi,Nano5656

I can send the reply to you by PM. smile.gif
Because my status is a bit sensitive to discuss other brand's fan.

Tony
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post #25 of 35
The inertia of the assembly is dominated by mass positioned furthest for the axis of rotation, that is why no wind turbines so far have used the solid rim, very few smaller fans either...I have seen automotive fans like this, where the air flow caused by the motion of the vehicle is substantial.

IMHO.

dunx

P.S. If those fans are SO good why weren't there any in my P280 ?
Edited by 2002dunx - 4/25/12 at 12:07pm
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post #26 of 35
Quote:
Originally Posted by tony_choi View Post

Hi,Nano5656
I can send the reply to you by PM. smile.gif
Because my status is a bit sensitive to discuss other brand's fan.
Tony

would also be interested in a CC on that reply biggrin.gif

i've always thought that design was for structural integrity of the fan blade(prevent fan blade deformation as a result of pushing air at high velocity) I can understand that design reduce wind shear so may be quieter but cant really find other real fluid dynamic benefits that is significant enough to warrant the redesign. given the Y.S. Tech TMD fan linked by ehume, I can see significant increase in fan blade surface area due to the great reduction in hub size. that would allow for much better airflow for the same given frame size. but as for the rim itself, i see little benefit aside from structural reinforcement. i'd be willing to bet that if the fan blades themselves were stiff enough and RPM of the fan is limited, the magnets can be mounted at the tip of the fanblade w/o the rim and the net effect would be about the same.

anyway. any insight would be appreciated smile.gif
post #27 of 35
Quote:
Originally Posted by psyclum View Post

would also be interested in a CC on that reply biggrin.gif
i've always thought that design was for structural integrity of the fan blade(prevent fan blade deformation as a result of pushing air at high velocity) I can understand that design reduce wind shear so may be quieter but cant really find other real fluid dynamic benefits that is significant enough to warrant the redesign. given the Y.S. Tech TMD fan linked by ehume, I can see significant increase in fan blade surface area due to the great reduction in hub size. that would allow for much better airflow for the same given frame size. but as for the rim itself, i see little benefit aside from structural reinforcement. i'd be willing to bet that if the fan blades themselves were stiff enough and RPM of the fan is limited, the magnets can be mounted at the tip of the fanblade w/o the rim and the net effect would be about the same.
anyway. any insight would be appreciated smile.gif

the blade surface may be larger but the inner portion isnt as important as the outer because of its slower tangential speed, so the improvement probably isnt very much
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post #28 of 35
Quote:
Originally Posted by ihatelolcats View Post

the blade surface may be larger but the inner portion isnt as important as the outer because of its slower tangential speed, so the improvement probably isnt very much

i'd say it's be maybe 5%? it's not just the surface area, it's the overall acceleration of air molecule. it's like having a longer ramp for the air molecule to be pushed along. it's the main reason why the scythe GT's are such successful fans. their blades aren't just big, they are also designed to be longer then conventional fan blades. it's like having a 140mm fan inside a 120mm chassis.
post #29 of 35
I, too, can't understand why these fan makers have such a sloppy tolerance between the blades and the housing.
 
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post #30 of 35
Quote:
Originally Posted by ramicio View Post

I, too, can't understand why these fan makers have such a sloppy tolerance between the blades and the housing.

i can. money
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