Cavitation Phenomenon of Deep Well Submersible Pump

Cavitation Phenomenon of Deep Well Submersible Pump
Liquid at a certain temperature, reduce the pressure to the temperature of the vaporization pressure, the liquid will produce bubbles. This phenomenon of bubble generation is called cavitation. Cavitation bubbles generated when the flow to the high pressure, the volume decreased so as to burst. This phenomenon is called cavitation collapse due to the pressure rise bubbles disappear in the liquid.
In the operation of the pump, if the partial pressure of the pumped liquid is reduced to the liquid vaporization pressure at the present temperature if the local area of ​​the overcurrent portion (usually somewhere later than the impeller blade inlet) is for some reason, A large amount of steam is generated and bubbles are formed. When the liquid containing a large amount of bubbles moves forward through the high pressure region in the impeller, the high pressure liquid around the bubble causes the bubble to sharply shrink and break. At the same time as the condensation of the bubble bursts, the liquid particles fill the holes at a high velocity, which produces a very strong water hammer at this moment and strikes the metal surface with a high impact frequency, the impact stress can reach several hundred to several thousand Atmospheric pressure, impact frequency up to tens of thousands of times per second, will be serious wall thickness breakdown.
In the pump in the bubble and bubble burst to flow components suffered damage to the process is the water pump cavitation process. Pump after the cavitation in addition to the flow components will have a damaging effect, but also produce noise and vibration, and lead to decreased pump performance, serious liquid will interrupt the pump can not work properly