Why does the speed increase when cavitation occurs?
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I would like to ask the experts: why is the second question in today’s daily quiz, \"When a non-constant-speed centrifugal pump experiences cavitation, its rotational speed increases slightly,\" considered correct? Why does the speed increase when cavitation occurs?
I think it’s because the load decreases when there’s time to spare
During cavitation, the speed is high, vibrations are severe, and the flow rate is low. The damage to the pump is very severe. The pump needs to be stopped immediately.
When cavitation occurs in the pump, the shaft power decreases (as the fluid being transported is not pure liquid), which reduces the load on the motor and lowers its slip rate; as a result, the motor speed increases slightly
The load decreases, and the speed increases slightly
When cavitation occurs, the pump interior is filled with a mixture of gas and liquid; as a result, the pump’s efficiency decreases and its shaft power drops. Since electric motors are usually asynchronous motors, their speed increases