摘要
水泵在变速工况下运行可以避免因运行工况发生变化带来的效率下降和水力不稳定。本文借助CFD计算方法,以立式轴流泵装置为研究对象,对其在叶轮转速从1461r/min到731r/min中六种转速下的最优工况进行水力性能分析。结果表明:随着转速的降低,叶轮最优效率会轻微下降,叶轮叶片两侧的压力梯度也会随之变小。同时从轮毂到轮缘方向,压力梯度增大,做功能力逐渐增加。从速度环量的角度来看,由于最优工况叶轮出口速度三角形相似,因此转速越大,出口截面的环量也会越大。本文研究为水泵装置在运行工况变化下进行转速调节提供参考。
Pump operate in variable speed condition can avoid efficiency decrease and hydraulic instability due to change of operating condition.This paper utilized CFD method,took a vertical axial-flow pump unit as object,analyzed the hydraulic characteristics under the optimal conditions of six rotating speeds varied from 1461r/min to 731r/min.The results indicate that,the impeller efficiencies and pressure difference between two side of impeller decrease while the rotating speed decrease.From hub to impeller tip,the pressure difference increase and the ability of working strengthened.With the view of velocity circulation,the velocity triangles are similar under optimal conditions of different rotating speeds,the larger rotating speed,the larger velocity circulation at the outlet of impeller.This study provides a reference for pump unit operating under variable condition and using rotating speed adjustment.
作者
阚阚
郑源
孙奥冉
KAN Kan;ZHENG Yuan;SUN Aoran(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China;Anhui Suivey and Design Institute of Water Conservancy and Hydropower,Hefei 230088,China)
出处
《水电与抽水蓄能》
2020年第4期46-49,共4页
Hydropower and Pumped Storage
基金
国家自然科学基金资助项目(51579080)
中央高校基本科研业务费项目(2019B06914)。
关键词
轴流泵装置
转速变化
压力分布
速度环量
axial-flow pump unit
different rotating speeds
pressure distribution
velocity circulation
