周向槽对半开叶轮离心泵流动特性的影响研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (17) : 175-182.

论文

王李科1，卢金玲1，2，廖伟丽2，王维1，2，郭鹏程1，2，罗兴锜1，2

作者信息 +

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

WANG Like1, LU Jinling1,2, LIAO Weili2, WANG Wei1,2, GUO Pengcheng1,2, LUO Xingqi1,2

Author information +

文章历史 +

摘要

离心泵内的不稳定流动现象会产生压力脉动，为了改善半开叶轮小流量工况下的内部流场和压力脉动，通过在前盖板上布置周向槽，分析了周向槽对叶轮内部流动特性和压力脉动的影响。结果表明，周向槽为泄漏流提供了周向通道，泄漏流能够从槽内快速通过，降低了泄漏流的驱动力，使得主流与泄漏流的交界面向叶片尾缘移动；靠近叶顶间隙叶片进口相对液流角和低速区面积减小，轴向速度增大，泄漏流导致的不稳定流场和阻塞现象减弱，近失稳工况点对应的流量向小流量工况偏移；周向槽不仅改善了前缘溢流，使得叶轮内低频压力脉动幅值下降，而且消除了叶片前缘泄漏流形成的回流及其诱发的22
fn特征频率。研究发现周向槽能够通过有效抑制不稳定流动及其诱发的压力脉动来改善离心泵小流量工况的运行稳定性。

Abstract

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 2.2fn 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.

导出引用

王李科，卢金玲，廖伟丽，王维，郭鹏程，罗兴锜. 周向槽对半开叶轮离心泵流动特性的影响研究[J]. 振动与冲击, 2021, 40(17): 175-182

WANG Like, LU Jinling, LIAO Weili, WANG Wei, GUO Pengcheng, LUO Xingqi. Effects of circumferential groove on flow characteristics of centrifugal pump with half open impeller[J]. Journal of Vibration and Shock, 2021, 40(17): 175-182

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