Is the number of blades in a centrifugal pump directly related to the pump’s flow rate and head?

2011-04-09View Original

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Is the number of blades in a centrifugal pump directly related to the pump’s flow rate and head?

Reply #22011-04-09

There shouldn’t be any! Head is related to the impeller diameter, while flow rate is related to the cross-section of the impeller flow channel

Reply #32011-04-09

With all other factors constant, and assuming no flow losses, the greater the number of blades, the higher the theoretical head. This is because an impeller with a finite number of blades can deliver less energy to the liquid compared to an impeller with an infinite number of blades. Relationship with flow rate: If, within an impeller, the inlet and outlet widths remain constant, changing the number of blades will inevitably lead to changes in the shape of the flow channel, which in turn alters the load on the blades and thus affects the rated flow rate

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