DESIGN AND NUMERICAL ANALYSIS ON AN AXIAL-FLOW MODEL PUMP WITH HIGH SPECIFIC SPEED

Tang Fangping  Wang Guoqiang

(School of Naval Architecture and Ocean Engineering, Shanghai Jiaotong University, Shanghai 200052)

Liu Chao  Zhou Jiren  Cheng Li

(School of Civil Engineering and Water Conservancy,Yangzhou University, Yangzhou 225009)

Abstract: An inverse method based on the model of radial equilibrium equation and 2-D panel method is used to design the axial-flow model pump with high specific speed. The numerical simulation is based on the CFX-TASCflow CFD code solving the 3-D RANS equations with the RNG  κ—ε model of turbulence. The multiple frame of reference capability (stage method) is applied to model the interaction between the impeller and guide vane as well as the grid embedding is used to simulate the tip clearance. The experimental results show the design method can assure design characteristic of the pump. A comparison of the calculation and the measurements demonstrates a very good agreement of the head and hydraulic efficiency at design point, but a significant departure at off-design point. The calculation also shows the negative thrust has turned up when the head is still positive, which exactly explain why the impeller is raised at high flow rate.

Key words: Hydraulic machinery  Axial flow pump  Turbulent flow  Numerical simulation  Panel method  Design

CLC No: TH312

“十五”国家重大技术装备研制资助项目(ZZ02-03-01-04). Received 20040312, received in revised form 20040922