贯流式电站流道短 ,上游闸门至机组首部距离很近 ,只有几米 ,闸门动水闭门过程形成的射流直冲灯泡体 ,容易引起振动 ,流道内产生的涡流易导致负压气蚀 ,导叶损坏。移置尾水管上能消除这种恶劣条件对机组的不利影响 ,尤其是要求电站作为泄洪通道和控制航运水位变幅时 ,则必须将 Turbine flow short runner, the upstream gate to the first unit close to the distance, only a few meters, the gate formed by the hydrodynamic closing door direct light bulbs, easily lead to vibration, flow vortex easily lead to negative pressure cavitation, Vane damaged. The displacement of the tail pipe can eliminate the adverse effects of such adverse conditions on the unit, especially when it is required that the power station act as a flood discharge channel and control the amplitude of the shipping water level,