PIV MEASUREMENTS AND NUMERICAL

SIMULATIONS OF FLOW IN CENTRIFUGAL

 PUMP IMPELLERS WITH SPLITTING VANES

YUAN Shouqi  HE Youshi  YUAN Jianping  CONG Xiaoqing  ZHAO Binjuan

(Fluid Machinery and Engineering Center, Jiangsu  University, Zhenjiang 212013)

Abstract: PIV technology and numerical simulations are employed to study the flow in centrifugal pump impellers with splitting vanes under different working states. Through experimental tests and numerical simulations, the flow fields in impellers are obtained for various working states. The results exhibit some basic flow characteristics in impellers: the asymmetry of flow in impellers; backflow occurs in the inlet suction side of long vanes; high speed region exists in the immediate region behind the shroud of splitting vanes; the outlet velocity profile is improved by splitting vanes; relative velocity increases evidently with the increase of flow rate. All these flow phenomena directly affect the performance of pumps.

Key words: Splitting vanes  Centrifugal pumps  Impellers  PIV technology  Numerical simulation

CLC No: TV136⁺.2

高等学校博士点基金资助项目. Received 20050712, received in revised form 20051116