排灌机械工程学报2018，Vol.36Issue(2)：93-97,110,6.DOI:10.3969/j.issn.1674-8530.16.0215
透平工况动静叶栅内固液两相流动压力脉动特性
Pressure fluctuation of solid-liquid flow in stator and rotor cascades of pump as turbine
摘要
Abstract
In order to study the pressure fluctuation characteristics of solid-liquid flow in stator and rotor cascades of pump as turbine,the centrifugal pump with space diffuser as turbine was chosen,and then the unsteady 3D flow field was simulated based on the large-eddy simulation (LES) and Mixture multiphase flow model with structured hexahedral mesh generated in ICEM.The pressure fluctuations under three different flow in water and solid-liquid two-phase were monitored in the numerical calculation.The results show that the point P3 between the stator and the rotor and the point P6 in the guide vane are due to the pressure gradient alternating change in the impeller under the water and solid-liquid two-phase,the periodicity of the pressure fluctuations in time domain is obvious,and consistent with the blade passing period.The presence of particles reduces the backflow of the draft tube,which makes the pressure fluctuation more stable at the small flow rate,and the existence of particles increases the flow field disturbance at the large flow rate.The results of the pressure fluctuations in frequency domain reveal that the main frequency are of the blade passing frequency (BPF) and the harmonic frequency is a multiple of the blade passing frequency under different conditions,and its amplitude shows exponential decay.The vortex induces second-harmonic in the impeller obviously.The particles enhance the high-frequency pressure fluctuation at the small flow rate but weaken it at the large flow rate.关键词
泵作透平/动静叶栅/固液两相/压力脉动Key words
pump as turbine/stator and rotor cascade/solid-liquid flow/pressure fluctuation分类
农业科技引用本文复制引用
韩伟,李雪峰,苏敏,李仁年,陈昊..透平工况动静叶栅内固液两相流动压力脉动特性[J].排灌机械工程学报,2018,36(2):93-97,110,6.基金项目
国家自然科学基金资助项目(51579125) （51579125）
兰州理工大学电气工程与信息工程学院实验室开放基金项目 （）
