In many self-priming or impeller type oil pump signs are marked with a cavitation words, the user can not help but ask what is cavitation phenomenon? The following: the performance of the pump because of its pumping special liquid type, nature and change. In addition, the pump performance has a great impact on cavitation phenomenon.
First of all, a brief explanation of cavitation phenomenon. The liquid partially generates steam when the static pressure of the low-pressure part of the flow is less than the saturated steam pressure at the temperature at which the liquid is pumped. Moreover, even if the pressure drops below a certain limit to saturation vapor pressure, bubbles are separated from the liquid. As this goes on, holes are created in the flow. This phenomenon is known as cavitation.
As for the mechanism of cavitation phenomenon, many people have carried out previous studies and published statements on this aspect, holding that the critical pressure of cavitation is different due to the amount of dissolved air in the liquid and the temperature of the liquid, etc.
On the other hand, based on the study of cavitation phenomenon of the pump, it can be known that in the operation of the pump, the lowest pressure part in the pump tends to occur near the impeller inlet, so cavitation often occurs in this part. The bubbles separated from the liquid due to cavitation gather near the impeller inlet, which will make the flow in the impeller become unstable and start to produce pressure fluctuations. As this state develops, cavitation is created in this part and pump performance begins to decline.
