Effects of circumferential groove on flow characteristics of centrifugal pump with half open impeller

被引：0
|
作者：
Wang L. [1 ]
Lu J. [1 ,2 ]
Liao W. [2 ]
Wang W. [1 ,2 ]
Guo P. [1 ,2 ]
Luo X. [1 ,2 ]
机构：
[1] State Key Lab of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an
[2] College of Water Resource and Hydro-electric Engineering, Xi'an University of Technology, Xi'an
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2021年 / 40卷 / 17期
关键词：
Centrifugal pump; Circumferential groove; Leading edge overflow; Leakage flow; Pressure fluctuation;
D O I：
10.13465/j.cnki.jvs.2021.17.024
中图分类号：
学科分类号：
摘要：
Unstable flow inside a centrifugal pump can cause pressure fluctuation. Here, to improve internal flow field and pressure pulsation of a half open impeller under the condition of small flow rate, effects of circumferential groove on internal flow characteristics and pressure pulsation of the impeller were analyzed by arranging circumferential groove on the front cover plate of the pump. The results showed that circumferential groove provides a circumferential channel for leakage flow, and leakage flow can quickly pass through groove to reduce driving force of leakage flow and make the interface of main flow and leakage flow move towards trailing edge of blade; the relative flow angle and the area of low-speed zone near blade tip clearance and blade inlet decrease, axial flow velocity increases, unsteady flow field and blockage phenomenon caused by leakage flow weaken, and the flow rate corresponding to near unstable condition point shifts to that under small flow rate condition; circumferential groove not only improves leading edge overflow and reduces amplitude of low-frequency pressure fluctuation in impeller, but also eliminates backflow caused by leading edge leakage flow and the 2.2fn characteristic frequency induced by backflow; circumferential groove can effectively suppress unsteady flow and pressure pulsation induced by it to improve the operation stability of centrifugal pump under the condition of small flow rate. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：175 / 182and228
相关论文
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