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Roscal · 06-01-2005, 04:27 AM

I forgot to talk about the number of channels or blades (depends on rotor topology), the flowrate isn't really "smooth" because of the finite number of blades, it's like a discontinuous movement. The more blades we've got (infinity is one limit in centrifugal pump theory), the less variations in flowrate at a final result. I think the frequency of this phenomenom is higher than the other at 50 or 100 Hz. If rotor has 6 blades at 3000 rev/min, this give 300 blade passages par second in front of the out of the pump, so 300 Hz frequency for (little) flowrate variation.

06-01-2005, 04:27 AM	#31
Roscal Cooling Savant Join Date: Apr 2002 Location: North of France Posts: 198	I forgot to talk about the number of channels or blades (depends on rotor topology), the flowrate isn't really "smooth" because of the finite number of blades, it's like a discontinuous movement. The more blades we've got (infinity is one limit in centrifugal pump theory), the less variations in flowrate at a final result. I think the frequency of this phenomenom is higher than the other at 50 or 100 Hz. If rotor has 6 blades at 3000 rev/min, this give 300 blade passages par second in front of the out of the pump, so 300 Hz frequency for (little) flowrate variation.