摘要
在充分考虑筒阀与邻近部件之间相互影响的基础上,本文以水轮机全流道为研究对象,利用非结构化网格划分计算区域,采用RNG k-ε湍流双方程模型对筒阀内部非定常流动进行研究,并对筒阀及上下游相关的水轮机各过流部件在动水关闭状态下进行数值模拟,着重分析并得出了水轮机筒阀周边流场及引水部件蜗壳、固定导叶和活动导叶在筒阀不同开度下的压力和流速分布等流态特征,这些流态特征的分析可以预测混流式水轮机的工作状态,防止飞逸现象的发生,同时也为水轮机筒阀电液同步控制系统提供设计和操作参数等理论依据。
To study the unsteady flow inside the ring gate,a numerical model was used to simulate the full flow passage of a hydraulic turbine on an unstructured mesh system with application of RNG k-ε turbulence models,focusing on the interactions between the ring gate and its surrounding components in the emergency shut-down process.A detailed analysis is presented on the flow field nearby the ring gate and the pressure and velocity distributions for the diversion components of spiral case,stay vanes and guide vanes at different gate openings.The presented analysis of hydrodynamic behaviors is a tool for prediction of Francis turbine＇s operation condition,and also a theoretical basis for design and operation parameters of the electro-hydraulic synchronous control system of ring gate.
出处
《水力发电学报》
EI
CSCD
北大核心
2012年第2期228-234,共7页
Journal of Hydroelectric Engineering
基金
天津市科技支撑重点项目(09ZCKFGX03400)
天津大学青年教师培养基金B类(TJU-YFF-08B24)
关键词
水力机械
水轮机筒阀
数值模拟
动水关闭
流态分析
hydraulic machinery
ring gate of hydraulic turbine
numerical simulation
emergency shut-down flow
flow pattern analysis
