Effect of Coupling Sawtooth and Pit Bionics on Noise of Centrifugal Pump

The strong noise produced by centrifugal pump during operation will do harm to the health of workers and pump group. In order to realize the low noise operation of centrifugal pump, researchers add bionic structure to the blade to realize the centrifugal pump noise reduction. At present, in the research of centrifugal pump noise reduction, pit bionic structure and sawtooth bionic structure are the most reprlesentative. Pit structure is for broadband noise reduction, sawtooth structure is for discrete noise reduction. From a macro perspective, if the two bionic structures are coupled, it is likely to bring greater noise reduction. Therefore, in this paper, sawtooth structure is installed on the trailing edge of the pitted blade, and the internal flow field and sound field of the bionic blade are studied, and the influence of the coupling bionic structure on the external characteristics, acoustic amplitude-frequency characteristics and flow field structure of the centrifugal pump is analyzed. The results show that the coupling bionic structure is greatly affected by the sawtooth structure, which makes the pit structure lose the original broadband noise reduction effect, and the two noise reduction mechanisms are different, which makes the pit and sawtooth structure incompatible.