Design and Improvements of Centrifugal Pumps with Low Specific Number of Speeds based on Inner Flow Analysis

Hydraulic design and improvements were performed using the traditional velocity coefficient method and the inner flow analysis technique in order to design high-efficient and stable-performance centrifugal pumps with low specific number of speeds.The primary design thought,inner flow analysis,and performance predication of the centrifugal pumps with low specific number of speeds were given,the experimental result of the model designed based on the velocity coefficient method verified the rationality of numerical method.Based on the basic design,the influence of the key size parameters of the volute that were difficult to be controlled by the traditional design on the performance of the centrifugal pumps was analyzed,and the key structures and parameters were designed and improved based on the analysis,numerical simulations and experiments show that the improved design raised the performance of the centrifugal pumps.The applications of the design and process can increase the hydraulic performance of the centrifugal pumps and reduce experimental times,shorten the development period of the centrifugal pumps.