摘要
为深入了解固液两相流下的离心泵叶轮内部的流动状态,进一步探索离心泵叶轮的磨损规律,基于计算流体动力学和数值模拟的方法,采用两相流模型以及Phase Coupled SIMPLE算法对离心泵叶轮部位在不同固相颗粒粒径和不同固相颗粒浓度下进行定常数值模拟。结果表明:不同固相颗粒粒径条件下,粒径较大的固相颗粒更容易对叶轮前后盖板造成磨损。粒径较小的固相颗粒对叶片进出口位置造成的磨损程度更高。不同固相颗粒浓度条件下,颗粒浓度的增加,致使叶轮前后盖板和叶片正反面的磨损率均有明显增加,叶片背面的比叶片工作面的磨损更加严重,叶轮的前盖板比后盖板更容易遭受泥沙磨损破坏。该研究对于提高黄河沿岸大批水利工程中离心泵的机组性能、安全运行以及磨损防护具有重大意义。
In order to deeply understand the internal flow state of centrifugal pump impeller under solid-liquid two-phase flow,and further explore the wear law of centrifugal pump impeller.Based on computational fluid dynamics and numerical simulation,two-phase flow model and phase coupled SIMPLE algorithm are used to simulate the impeller of centrifugal pump under different solid particle sizes and solid particle concentrations.The results show that under different solid particle sizes,with the increase of solid particle size,larger solid particles are more likely to wear the front and rear cover plates of the impeller.The smaller the solid particle size,the higher the wear degree of the inlet and outlet of the blade.Under different solid particle concentrations,with the increase of solid particle concentration,the most serious wear basically occurs in the impeller inlet,near the working surface of the blade head and in the impeller passage.The abrasion on the back of the blade is more serious than that on the working surface of the blade,and the front cover plate of the impeller is more vulnerable to sediment abrasion than the rear cover plate.The research is of great significance to improve the performance,safe operation and wear protection of centrifugal pumps in a large number of water conservancy projects along the Yellow River.
作者
关婷月
Guan Tingyue(North China University of Water Resources and Electric Power,Zhengzhou 450045,Henan)
出处
《吉林水利》
2022年第10期21-29,共9页
Jilin Water Resources
关键词
离心泵
叶轮
固液两相流
泥沙磨损
数值模拟
centrifugal pump
impeller
solid-liquid two-phase flow
sediment abrasion
numerical simulation
