Blades layout and optimization of medium specific speed centrifugal pump

Abstract

In this paper, a centrifugal pump of medium specific speed is taken as the research object, and the performance changes of the centrifugal pump are studied by setting five different ratio degrees of blades. The results show that due to the shortening of the blade length, the pump head and efficiency both decrease with the decrease of the ratio degree. In terms of static pressure distribution, the high pressure area in the volute expands from the outlet to the upstream with the decrease of the ratio degree, and forms an obvious boundary layer with the pressure in the impeller. Under the rated flow, the model pump with ratio degree R=2/3 has the best cavitation performance. When the number of impeller blades with a ratio of 2/3 was optimized, the flow field performance of the model pump with 8 blades was the best, and the head increased by 7.33% compared with the prototype pump at rated flow.

Study on Performance Characteristics and Influencing Factors of Four-outlet Centrifugal Pump

“…The study showed that at high flow rates, the head and efficiency of the centrifugal pump are significantly affected by the inducer clearance, with an increase in clearance leading to an increase in head and efficiency. Wang et al [5] investigated the effect of blade geometry parameters on the performance characteristics of a centrifugal pump at medium specific speeds and found that as the length of the blades decreases, the head and efficiency also decrease. Zhao et al [6] studied the impact of different blade parameters on the external characteristics of the pump and found that within a certain range of blade thickness variation, increasing the blade thickness slightly improves the maximum efficiency of the centrifugal pump.…”