Experimental research on internal flow in impeller of a low specific speed centrifugal pump by PIV

[摘要] For the purpose of investigating the influence of two different impellers, one is with splitter blades and the other one is without splitter blades, on a low-specific centrifugal pump. The experimental investigation in impellers was conducted at different conditions and phases by means of PIV (Particle Image Velocimetry) to study the internal flow. Meanwhile, the absolute and relative velocity distributions in impellers were obtained. Experimental results show that the head value is higher in the impeller with splitter blades and both two head curves appear hump phenomena at small flow rate. The absolute velocity value increases with radius and from pressure side to suction side at the same radius gradually. The splitter blades can scour the wake, making outlet velocity distribution more uniform and improving the internal flow. The velocity distribution becomes less even in the process of closing to tongue due to reinforced interference of tongue on internal flow.

[发布机构] National Research Centre of Pumps, Jiangsu University, Zhenjiang, Jiangsu; 212013, China^1

[效力级别] 工业技术 [学科分类] 工业工程学

[关键词] Absolute velocities;Experimental investigations;Experimental research;Internal flows;Low specific speed centrifugal pump;Particle image velocimetries;Small flow-rate;Splitter blade