| 摘要 |
A system for controlling water level upstream of the system comprises a rotor assembly 110, preferably a pair or meshing rotor assemblies 110 each comprising a vertical axis rotor having radially extending vertical blades 124. The rotor assemblies 110 are disposed in a conduit 6, eg in through barrage, which has opposing surfaces, eg seal assemblies 112, which are contacted by the radially outer edge regions of the blades such that there is at least one position of each rotor assembly in which a blade is in contact with each of the opposing surfaces. Means are provided for controlling the speed of rotation of the rotor(s), eg by generating energy. |
