Questions about the performance curve of centrifugal pumps
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As can be seen from the picture below, when the flow rate of a centrifugal pump increases, its head decreases and the shaft power increases. An increase in flow will cause an increase in shaft power, while a decrease in lift will cause a decrease in shaft power. As can be seen from this figure, flow has a greater impact on shaft power than lift?
It can be analyzed from the formula, N=HQρ/102η
The illustrations are very intuitive and no problem
How can the head of a centrifugal pump drop so steeply?
The head of a centrifugal pump at dead center is generally 1.1-1.3 times the design point, which is very small compared to the change in flow rate.