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排灌机械工程学报  2011, Vol. 29 Issue (1): 1-5    DOI: doi:10.3969/j.issn.1674—8530.2011.01.001
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水泵水轮机水轮机制动区的流动特性
王乐勤1,刘锦涛1,梁成红2,焦 磊1
(1.浙江大学化工机械研究所.浙江杭州310027;2.浙江省电力设计院,浙江杭州310012)
Flow characteristics of pump-turbine at turbine braking mode
Wang Leqinl.Liu Jintao,Liang Chenghong2,Jiao Leil
(1.Institute of Chemical Machinery Engineering,Zhejiang University,Hangzhou,Zhejiang 310027,China;2.Zhejiang Electric Power De-
sign Institute,Hangzhou,Zhejiang 310012,China)
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摘要 摘要:为研究水泵水轮机水轮机制动区的不稳定流动特性,根据某抽水蓄能电站建立水力模型,应用计算流体动力学软件FIuent模拟其流动特征.采用SST k-ω,模型和SIMPLEC算法计算水轮机制动工况的内流场和外特性,并结合试验数据进行对比验证.结果表明,水泵水轮机在水轮机制动工况随流量的变化水头变化不大,在力矩为0时的水头最低;导叶开度越大,进入制动区时所需的转速越高,且流量越大,可以通过调节导叶开度防止水泵水轮机进入制动区;导叶工作开度下力矩为0时的流场不存在涡结构,随着流量的减小,在叶片和活动导叶的进口以及固导叶和活动导叶之间出现大量的回流涡,并且呈现出类周期性分布特征;转轮中的回流涡是由于前倾式叶片的倾角较大产生的,导叶中的回流涡是由于流体流动方向与导叶叶片的冲角引起的.以土结论可为水泵水轮机的优化设计提供一定的理论基础.
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关键词水泵水轮机   制动工况   数值模拟   SST k一ω模型   流动特性     
Abstract: bstract:To study the instability characteristics of pump—turbine at turbine braking mode,a hydraulic model Wag established based on a pumped storage power station.The SST k一ω model and SIMPLEC algorithms were used to simulate the internal flow fields and external characteristics at turbine braking
condition.Compared with the experimental data,the simulation results were examined.The results show that the head changes is small as flow rate changes in turbine braking condition.Higher rotating speed is needed to get into the braking mode as the opening of guide vanes increase.The pump turbine can be prevented from running into braking mode by adjusting the opening of guide vanes.Flow is regular and there is no vortex structure at zero moment point when guide vanes at operating opening.There have lots of periodical distribution vonexes in inlet of blades and guide vanes a8 well as the region between guide vanes and stay vanes with flow rate decreased.The vortexes in runner are caused by large forward inclina-tion of blade,while vortexes in guide vanes are due to the angle of attack between flow direction andguide vanes.These conclusions can provide a theory basis for optimal design for pump-turbine.
Key wordsump-turbine   turbine braking mode   numerical simulation   SSTk一&omega   model   flow characteristics   
收稿日期: 2011-07-17; 出版日期: 2010-11-30
基金资助:

国家自然科学基会资助项目(50979095/E090603)

通讯作者: 刘锦涛(1986一).男,山东日照人,博士生研究生(1iujinta086@hotmail.com).主要从事流体主要从事流体机械瑚论及结构优化设计研究.   
作者简介: 王乐勤(1945一),男,山东聊城人.教授.博士生导师(hj_wlq2@ziu.edu.cn).主要从事流体机械理论及结构优化设计研究.
引用本文:   
. 水泵水轮机水轮机制动区的流动特性[J]. 排灌机械工程学报, 2011, 29(1): 1-5.
. Flow characteristics of pump-turbine at turbine braking mode[J]. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(1): 1-5.
 
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