CFD Analysis of Centrifugal Pumps with Variations of Blade Number at 3300 RPM

摘要

Centrifugal pumps are used extensively for hydraulic transportation of liquids over short to medium distance through pipelines where the requirements of head and discharge are moderate. The pump design is facilitated by the development of computational fluid dynamics and the complex internal flows in water pump impellers can be well predicted. Various parameters affect the pump performance. The impeller outlet diameter, the blade angle and the blade number are the most critical. The blade number of impeller is an important parameter of pumps, which affects the performance of pump heavily. In this study, the performance of impellers with the same outlet diameter having different blade numbers is thoroughly evaluated. The model pump has a design rotation speed of 3300 rpm and an impeller with 4, 5, 6 numbers of blades has been considered. The inner flow fields and characteristics of centrifugal pump with different blade number are simulated and predicted by using Ansys Fluent software. For each impeller, static pressure distribution, total pressure distribution and the changes in head as well as efficiencies of centrifugal pump are discussed. It has been observed that with the increase of blade number, the head and static pressure of the model increases, but the variable regulation of efficiency is little bit complicated. But the optimum blade number of the model pump in this paper for efficiency is 5 respectively.