Centrifugal pump
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What changes occur in the operating condition of the pump after performing small cutting operations on the outer circumference of the centrifugal pump impeller?
Both flow rate and head are decreasing, with the head dropping more rapidly; efficiency has seen a slight decline as well
Both flow rate and head decrease, efficiency drops, while the net positive suction head increases
Q, H, and N all decrease! And it’s accelerating in its decline!
According to the pump laws, flow rate is proportional to the impeller diameter, head is proportional to the square of the impeller diameter, and power is proportional to the cube of the impeller diameter. So when the impeller diameter decreases, Q, H, and N all decrease! And it’s accelerating in its decline!
Take the cutting law as an example: flow rate is proportional, head is proportional to the square of flow rate, and shaft power is proportional to the cube of flow rate
Q. What is H.N.? Please explain it