The Flow Simulation and Experimental Study of Low-Specific-Speed High-Speed Complex Centrifugal Impellers

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The Flow Simulation and Experimental Study of Low-Specific-Speed High-Speed Complex Centrifugal Impellers

CUIBaoling^a;ZHUZuchao^b;ZHANGJianci^c; CHENYing^a

a State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
b Zhejiang Provincial Key Lab of Modern Textile Machinery, Zhejiang Sci-Tech University, Hangzhou 310018, China
c Department of Mechanical Engineering, Western College, Zhejiang University of Technology, Quzhou 324000, China

Received:1900-01-01 Revised:1900-01-01 Online:2006-08-28 Published:2006-08-28
Contact: CUI Baoling

低比转速高速复合离心叶轮的流动模拟和试验研究

崔宝玲^a;朱祖超^b; 张剑慈^c; 陈鹰^a

a State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
b Zhejiang Provincial Key Lab of Modern Textile Machinery, Zhejiang Sci-Tech University, Hangzhou 310018, China
c Department of Mechanical Engineering, Western College, Zhejiang University of Technology, Quzhou 324000, China

通讯作者: 崔宝玲

Abstract

Abstract: Based on the Navier-Stokes equations and the Spalart-Allmaras turbulence model, three-dimensional turbulent flow in four low-specific-speed centrifugal impellers are simulated numerically and analyzed. The relative velocity distribution, pressure distribution and static pressure rise at the design point are obtained for the regular impeller with only long blades and three complex impellers with long, mid or short blades. It is found that the back flow region between long-blade pressure side and mid-blade suction side is diminished and is pushed to pressure side of short blades near the outlet of impeller at suction side by the introduction of mid, short blades, and the size of back flow becomes smaller in a multi-blade complex impeller. And the pressure rises uniformly from inlet to outlet in all the impellers. The simulated results show that the complex impeller with long, mid and short blades can improve the velocity distribution and reduce the back flow in the impeller channel. The experimental results show that the back flow in the impeller has an important influence on the performance of pump and a more-blade complex impeller with long, mid and short blades can effectively solve low flow rate instability of the low-specific-speed centrifugal pump.

Key words: centrifugal pump, low-specific-speed, complex impeller, flow simulation, high speed, experimental study

摘要： Based on the Navier-Stokes equations and the Spalart-Allmaras turbulence model, three-dimensional turbulent flow in four low-specific-speed centrifugal impellers are simulated numerically and analyzed. The relative velocity distribution, pressure distribution and static pressure rise at the design point are obtained for the regular impeller with only long blades and three complex impellers with long, mid or short blades. It is found that the back flow region between long-blade pressure side and mid-blade suction side is diminished and is pushed to pressure side of short blades near the outlet of impeller at suction side by the introduction of mid, short blades, and the size of back flow becomes smaller in a multi-blade complex impeller. And the pressure rises uniformly from inlet to outlet in all the impellers. The simulated results show that the complex impeller with long, mid and short blades can improve the velocity distribution and reduce the back flow in the impeller channel. The experimental results show that the back flow in the impeller has an important influence on the performance of pump and a more-blade complex impeller with long, mid and short blades can effectively solve low flow rate instability of the low-specific-speed centrifugal pump.

关键词: centrifugal pump;low-specific-speed;complex impeller;flow simulation;high speed;experimental study

CUIBaoling,ZHUZuchao,ZHANGJianci, CHENYing. The Flow Simulation and Experimental Study of Low-Specific-Speed High-Speed Complex Centrifugal Impellers[J]. .

崔宝玲,朱祖超, 张剑慈, 陈鹰. 低比转速高速复合离心叶轮的流动模拟和试验研究[J]. CIESC Journal.

References

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