水泵水轮机非同步导叶启动工况三维模拟研究

TV734; 水泵水轮机低水头启动时,空载工况附近S特性明显,工况点进入后,机组宏观参数易发生振荡.为研究低水头启动工况机组快速稳定的内流机理,设置非同步导叶,引入调速器参数,通过三维模拟分析启动全过程宏观参数、压力脉动与流态的演变规律.结果表明,启动过程初期导叶同步开启,转速较小,转轮叶道内产生大范围失速涡,压力呈低频高幅值波动;转速上升过程中,流态逐渐平顺,压力脉动逐渐降低;进入调速器调节阶段后,工况点进入S区,压力脉动呈高频高幅值,而非同步导叶破坏了无叶区产生的高速水环,促使机组快速稳定....

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Published in	中国农村水利水电 no. 3; pp. 231 - 237
Main Authors	杨志炎, 方红, 弓路家, 廖庭庭
Format	Journal Article
Language	Chinese
Published	上海勘测设计研究院有限公司,上海 200434 13.03.2024
Subjects	flow patterns 启动过程 misaligned guide vanes 水泵水轮机 pressure fluctuations 非同步导叶流态 pump-turbine start-up process 压力脉动
Online Access	Get full text
ISSN	1007-2284
DOI	10.12396/znsd.231171

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Abstract	TV734; 水泵水轮机低水头启动时,空载工况附近S特性明显,工况点进入后,机组宏观参数易发生振荡.为研究低水头启动工况机组快速稳定的内流机理,设置非同步导叶,引入调速器参数,通过三维模拟分析启动全过程宏观参数、压力脉动与流态的演变规律.结果表明,启动过程初期导叶同步开启,转速较小,转轮叶道内产生大范围失速涡,压力呈低频高幅值波动;转速上升过程中,流态逐渐平顺,压力脉动逐渐降低;进入调速器调节阶段后,工况点进入S区,压力脉动呈高频高幅值,而非同步导叶破坏了无叶区产生的高速水环,促使机组快速稳定.
AbstractList	TV734; 水泵水轮机低水头启动时,空载工况附近S特性明显,工况点进入后,机组宏观参数易发生振荡.为研究低水头启动工况机组快速稳定的内流机理,设置非同步导叶,引入调速器参数,通过三维模拟分析启动全过程宏观参数、压力脉动与流态的演变规律.结果表明,启动过程初期导叶同步开启,转速较小,转轮叶道内产生大范围失速涡,压力呈低频高幅值波动;转速上升过程中,流态逐渐平顺,压力脉动逐渐降低;进入调速器调节阶段后,工况点进入S区,压力脉动呈高频高幅值,而非同步导叶破坏了无叶区产生的高速水环,促使机组快速稳定.
Abstract_FL	When the pump-turbine starts at low head conditions,the S-shaped characteristics are obvious at the speed-no-load point,and the macro-parameters of the pump-turbine units are easy to oscillate.In order to investigate the internal flow mechanism of the pump-tur-bine during rapid stabilization process under low head start-up conditions,misaligned guide vanes are set up,and the governor regulation is introduced in the three-dimensional simulation.Then,the macro-parameters,pressure fluctuations,and flow pattern evolutions during the entire start-up process are analyzed.The results show that at the initial stage,the guide vanes are opened synchronously and the rotational speed is relatively small,and a large range of stall vortex is generated in the runner blade passages,resulting in low-frequency and high-am-plitude pressure fluctuations.With the increase in rotational speed,the flow patterns gradually become steady and the pressure fluctuations have obvious decreases.After entering the regulating stage,the operating point enters the S-shaped region,and the pressure fluctuations show high-frequency and high amplitude characteristics.The misaligned guide vanes destroy the high-speed water ring generated in the vaneless space,promoting the rapid stability of the unit.
Author	廖庭庭弓路家方红杨志炎
AuthorAffiliation	上海勘测设计研究院有限公司,上海 200434
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DocumentTitle_FL	Three-dimensional Simulation of the Start-up Process in a Pump-turbine with Misaligned Guide Vanes
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Title	水泵水轮机非同步导叶启动工况三维模拟研究
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