漫湾水电站二期工程进水口漩涡问题研究

漫湾水电站二期工程进水口运行条件与原设计条件相比有较大变化,二期工程装机容量由原设计的250 MW增至300MW,引水发电流量由原设计的321 m3/s增至384 m3/s,并要求在小湾电站完建前投产发电。由于引水发电流量增大,而水库的汛限水位比后期发电控制水位低,已建进水口不能满足最小淹没度的要求。水工模型试验的结果表明,在上游水位985.0~986.0 m范围内,两侧流道会出现第②漩涡,而将引水发电流量减小至360~300 m3/s,可避免出现漩涡;在高水位条件下则未见不利流态与有害漩涡出现。

Study on Vortices at Intake of Manwan Hydropower Station Ⅱ

The working condition of the intake of the Manwan hydropower station II changes a lot as compared with its original design.Its installed capacity is increased from 250MW to 300MW and its power discharge is increased from the original 321 m~3/s to 384 m~3/s.It is scheduled to be put into operation prior to completion of the Xiaowan hydropower project.Because of the increasing of the power discharge and the lower operating water level the completed intake is unable to meet the requirement of min.submerged depth.The hydraulic test indicates that when the upstream water level is between 985.0 m and 986.0 m vortices would occur in both lateral flow channels,but when the power discharge is reduced to 360 m 300 m~3/s no vortices occur,and neither unfavorable flow pattern nor harmful vortices occur when the water level is higher than 987.0 m.