How Should Centrifugal Pumps Resist Cavitation?

As is well known, when there is air in the casing of a centrifugal pump, the density of the air is much lower than that of the liquid, resulting in a smaller centrifugal force. As a result, the pressure difference between the liquid level in the storage tank and the pump suction port is not sufficient to press the liquid in the storage tank into the pump, which means that the centrifugal pump has no self suction ability, making it unable to transport liquid. This phenomenon is called "cavitation phenomenon". So how can we improve the anti cavitation performance of centrifugal pumps? What are the tricks?
The key to improving the anti cavitation performance of centrifugal pumps themselves:
(1) Improve the structural design of the suction port of the centrifugal pump to the vicinity of the impeller. Increase the flow area; Increase the curvature radius of the inlet section of the impeller cover plate to reduce the rapid acceleration and pressure drop of the liquid flow; Reducing the thickness of the blade inlet appropriately and rounding the blade inlet to make it close to the streamline shape can also reduce the acceleration and pressure drop around the blade head; Improve the surface smoothness of the impeller and blade inlet to reduce resistance loss; Extend the inlet edge of the blade towards the inlet of the impeller, allowing the liquid flow to receive work in advance and increase pressure.
(2) Adopting a front inducer to advance the work of the liquid flow in the front inducer to increase the pressure of the liquid flow.
(3) By using a double suction impeller, allowing liquid flow to enter the impeller simultaneously from both sides, the inlet cross-section can be doubled, and the inlet flow rate can be reduced by twice.
(4) The design condition adopts a slightly larger positive angle of attack to increase the blade inlet angle, reduce the bending at the blade inlet, reduce blade blockage, and increase the inlet area; Improve working conditions under high flow rates to reduce flow losses. But the positive angle of attack should not be too large, otherwise it will affect efficiency.
(5) Use anti cavitation materials. Practice has shown that the higher the strength, hardness, and toughness of materials, the better their chemical stability, and the stronger their resistance to cavitation erosion.