Improved design and model experimental verification of centrifugal blade profile based on flow analysis

In order to improve the efficiency of the centrifugal pump, this paper employs numerical simulation to study the internal flow of a centrifugal pump model with a specific speed ns=65.6. Based on the flow analysis results, flow control strategies are proposed, and a “bulged” impeller with a special blade pressure surface profile is designed. Research is conducted on the internal flow of the “bulged” impeller centrifugal pump, while the entropy production method is employed for a quantitative analysis of energy losses in various flow components. The results indicate that compared with the original impeller centrifugal pump, the total entropy production in the front chamber, back chamber, volute, and outlet pipe of the “bulged” impeller centrifugal pump is reduced. Additionally, the separation vortex on the pressure surface of the “bulged” impeller blade disappears, and the entropy production on the blade wall surface decreases. The study of the internal pressure fluctuation intensity in the centrifugal pump found that the pressure fluctuation intensity at various monitoring points within the impeller and volute of the “bulged” impeller centrifugal pump is reduced, leading to improved dynamic performance. Experimental results of the centrifugal pump show that the “bulged” impeller centrifugal pump exhibits a significant increase in efficiency from low flow to design flow conditions.