What is the mechanism of internal recirculation cavitation in centrifugal pumps?
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I’m not quite clear about this: 1. Why does a too low pumping flow rate cause backflow cavitation? Is it the medium that flows back from the mouthpiece gap? If it’s the medium flowing back due to the gap in the mouth ring, why doesn’t backflow occur when the flow rate increases? Is it because it just came back out before being sucked in again? 2. The issue of excessive inlet pressure is even harder to understand... 3. I’m not quite clear as to why low flow rate and high inlet pressure lead to backflow; thirdly, I’d like to know why backflow causes cavitation...
“\"Internal recirculation cavitation\" sounds unfamiliar; I’m not sure of its origin. It seems better to take a look at the explanation of \"cavitation\". While the pump is in operation, it is sufficient to ensure that the equipment parameters are met; if the flow rate is too low, the temperature of the medium inside the pump rises, leading to vaporization. This results in gas occupying the space in the volute, and the pressure drops to almost zero. As for the \"cavitation\" caused by too high inlet pressure, it seems to require further investigation. It is still necessary to follow the professional definition of the term \"cavitation,\" and careful consideration should be given to textbooks compiled by various organizations. Additionally, it is necessary to understand the working principle of centrifugal pumps. For reference.