排灌机械工程学报2013，Vol.31Issue(1)：7-10,35,5.DOI:10.3969/j.issn.1674-8530.2013.01.002
水泵水轮机泵工况的压力脉动特性
Pressure fluctuation characteristics of pump-turbine at pump mode
摘要
Abstract
To study the hydraulic instability of a pump-turbine at the pump mode under different working conditions,the three-dimensional,unsteady flow in the whole passage of the pump-turbine was conducted by using computational fluid dynamics software-Fluent under the optimal,low and high flow rate conditions.The pressure fluctuations were monitored respectively at the inlet of spiral casing,in the interface of runner and guide vanes,and in the space between head cover and runner,as well as in draft tube.The results show that a larger pressure fluctuation can be found in the interface of runner and guide vanes and in the space between the runner and head cover,while the pressure fluctuation is lower at the inlet of the spiral casing and in the draft tube.The pressure fluctuation is the smallest under the optimal condition; the larger the working condition deviates from the optimal one,the more considerable the fluctuation is.The dominant frequency of pressure fluctuation depends on the locations monitored.The dominant frequencies are integer multiples of the blade passing frequency and the runner rotational frequency in the interface of runner and guide vanes and in the space between runner and head cover,respectively.However,the dominant frequencies of the pressure fluctuation at the inlet of the spiral casing and in the draft tube are mainly related to low-frequency components.关键词
水泵水轮机/泵工况/压力脉动/非定常流动/频率分析Key words
pump-turbine/pump mode/pressure fluctuation/unsteady flow/frequency analysis分类
农业科技引用本文复制引用
王乐勤,刘迎圆,刘万江,覃大清,焦磊..水泵水轮机泵工况的压力脉动特性[J].排灌机械工程学报,2013,31(1):7-10,35,5.基金项目
国家自然科学基金资助项目(51176168) （51176168）
"十二五"国家科技支撑计划项目(2011BAF03B01) （2011BAF03B01）
