Effect of number of vanes on pump capacity 1

[LJGeer]

How does decreasing the number of vanes on an impellor affect the pumps capacity? The vane profile is not changed.

 

[abeltio]

see stepanoff - design of centrifugal and axial pumps

saludos.
a.

 

[unclesyd]

Here is good wesite for all your pump information.

http://www.mcnallyinstitute.com

 

[quark]

Actually pump capacity is not much effected. But it does effect the head and flowrate relationship. Increasing no. vanes flattens up the pump curve.

Regards,


Eng-Tips.com : Solving your problems before you get them.

 

[fredt]

My knowledge relates to fans but pumps and fans are similar in this regard.

The number of vanes affects the "slip". That is the actual discharge angle vs. the theoretical discharge angle. This in turn affects the head. The fewer vanes the more slip, the less head.

There is an optimum number of vanes beyond which the friction losses offset any gains.