摘要
水电站水力过渡过程计算中,明满流现象一直是仿真模拟的难点。针对某大型水电站发生过渡过程时尾水隧洞中出现的明满流现象,采用数值模拟方法,研究了设置尾水调压室后,尾水隧洞明满流过程对机组尾水管进口最小压力及机组一次调频性能的影响。结果表明,尾水调压室可在一定程度上削减明满流对机组运行的干扰,同时尾水洞中的明满流又可减少调压室水位波动幅值,二者的合理搭配改善了尾水系统过渡过程品质,可为发生眀满流现象的水电站尾水系统设计提供借鉴。
In the calculation of hydraulic transients in a hydropower station,the hydraulic problems caused by freesurface and pressurized flow is relatively complex.In consideration of this phenomenon,numerical simulation is used to study the impact of the transient free-surface,pressurized flow in a tailrace tunnel on the minimum pressure at inlet of the draft tube and the lining segment of the tailrace tunnel and the impact on the primary frequency regulation of the unit.The results show that the existence of tailrace surge tank can reduce the disturbance of the mixture flow on the units.Meanwhile,free-surface and pressurized flow can speed up the attenuation of the surge in the surge tank.Reasonable arrangement can mitigate transients in the tailrace system,which may provide a reference for similar projects.
出处
《水电能源科学》
北大核心
2015年第8期90-93,共4页
Water Resources and Power
关键词
明满流
尾水管进口最小压力
稳定性
一次调频
free-surface and pressurized flow
the minimum pressure at the inlet of the draft tube
stability
primary frequency regulation
