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I would like to ask the teachers: how should we understand the net positive suction head of a pump?
The excess energy that prevents vaporization of the liquid at the pump inlet can also be understood as the decrease in pressure that occurs when the speed of the liquid as it enters the pump inlet (the blade inlet) increases; more details on this can be found in various references
At normal pressure, water boils at 100 degrees. The net positive suction head of a pump is like the situation on the Tibetan Plateau, where water boils at a temperature lower than 100 degrees