Influence of circular non-smooth structure on cavitation damage characteristics of centrifugal pump

Centrifugal pump, as one of the important fluids conveying equipment, is easy to appear cavitation damage at run time, which seriously affects the stability of the centrifugal pump operation. To explore the anti-cavitation mechanism of centrifugal pump and improve the anti-cavitation performance of centrifugal pump, this paper firstly extracted the non-smooth structure of biological surface and applied it to the suction surface where cavitation is most likely to occur in centrifugal pump. Then, the influence of circular non-smooth surface with diameter of d = 1 mm on cavitation damage characteristics was studied by numerical simulation. The relationship between cavitation damage and cavitation evolution is pointed out by analyzing the gas content and the cavitation damage energy release value at different cavitation allowance. By analyzing the relationship between impeller void fraction and cavitation damage intensity and damage area, the mechanism of non-smooth surface structure improving the cavitation damage of centrifugal pump was clarified. The results show that the circular non-smooth surface structure with d = 1 mm can improve the distribution of cavitation on the blade, effectively reduce the degree of cavitation damage in the centrifugal pump and reduce the area of cavitation damage.