抽水蓄能电站同发同抽水力特性VOF数值模拟
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摘要
为了有效缓解电网突然出现的电力不平衡现象,同一个抽水蓄能电站不同水力单元机组同时分别发电及抽水运行,是对抽水蓄能运行及调度方式的一个重大创新措施。以某抽水蓄能电站上库为例,通过数学模型研究上库进/出水口在同发同抽工况下的库区水流流态、流道的水力特性、库区漩涡特性等水力参数的变化规律。结果表明,VOF方法可很好地模拟抽水蓄能同发同抽过程;同发同抽工况下,库区内进出水口附近局部水流流态与单向运行工况基本一致,但是两进/出水口之间形成连通的水流通道,库区内形成大范围横向流动,致使抽水单元大部分水流再次进入发电单元。
In order to effectively alleviate the sudden power imbalance of the power system,the different hydraulic units of the same pumped storage power station are respectively in the power generation and pumping operation,which is a major innovation measure for the pumping storage operation and dispatching mode.This paper takes a reservoir of a pumped storage power station as an example to study the change rule of hydraulic parameters such as the flow regime,hydraulic characteristics of the flow channel,and the vortex characteristics of the reservoir in the reservoir area under the same pumping condition through mathematical model.Simulation results show that the VOF method is a good way to simulate the pumping process.Under the same condition,the local water flow inlet and outlet of the reservoir area is basically consistent with the one-way operation condition.But there is a connected flow channel between the two inlet/outlets,and a wide horizontal flow is formed in the reservoir area.As a result,most of the water in the pumping unit flows into the power generation unit again.
In order to effectively alleviate the sudden power imbalance of the power system,the different hydraulic units of the same pumped storage power station are respectively in the power generation and pumping operation,which is a major innovation measure for the pumping storage operation and dispatching mode.This paper takes a reservoir of a pumped storage power station as an example to study the change rule of hydraulic parameters such as the flow regime,hydraulic characteristics of the flow channel,and the vortex characteristics of the reservoir in the reservoir area under the same pumping condition through mathematical model.Simulation results show that the VOF method is a good way to simulate the pumping process.Under the same condition,the local water flow inlet and outlet of the reservoir area is basically consistent with the one-way operation condition.But there is a connected flow channel between the two inlet/outlets,and a wide horizontal flow is formed in the reservoir area.As a result,most of the water in the pumping unit flows into the power generation unit again.
引文
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[4] 蔡付林,胡明,张志明.双向水流侧式进/出水口分流墩研究[J].河海大学学报:自然科学版,2000,28(2):73-77.
[5] Shih T H,Liou W W,ShabbirA,e t al.A Newκ-εEddy Viscosity Model for High Reynolds NumberTurbulent Flows[J].Computers and Fluids,1995,24(3):227-238.
[6] Hirt C W,Niehols B D.Volume of fluid(VOF)Methodfor the Dynamics of Free Boundaries[J].J ComputPhys,1981,39(3):201-225.
[7] 沙海飞,周辉,黄东军.抽水蓄能电站侧式进/出水口数值模拟[J].水力发电学报,2009,28(1):84-88.
[2] 苏曼.敦化抽水蓄能电站上水库进/出水口水力学数值模拟[D].天津:天津大学,2011.
[3] 高学平,叶飞,宋慧芳.侧式进/出水口水流运动三维数值模拟[J].天津大学学报,2006,39(5):518-522.
[4] 蔡付林,胡明,张志明.双向水流侧式进/出水口分流墩研究[J].河海大学学报:自然科学版,2000,28(2):73-77.
[5] Shih T H,Liou W W,ShabbirA,e t al.A Newκ-εEddy Viscosity Model for High Reynolds NumberTurbulent Flows[J].Computers and Fluids,1995,24(3):227-238.
[6] Hirt C W,Niehols B D.Volume of fluid(VOF)Methodfor the Dynamics of Free Boundaries[J].J ComputPhys,1981,39(3):201-225.
[7] 沙海飞,周辉,黄东军.抽水蓄能电站侧式进/出水口数值模拟[J].水力发电学报,2009,28(1):84-88.