Hydro-turbine runner

Details Hydro-turbine runner Hydro-turbine runner

F - Mech Eng,Light,Heat,Weapons

03

B

F03B 3/14 (2006.01) F01D 7/00 (2006.01)

Patent

CA 2217826

A turbine, disposed in water flowing therethrough, includes a hub and associated runner blades. Each blade comprises an inner surface and a distal outer surface, a leading edge and a trailing edge separated by a water directing surface. Each blade is rotatable relative to the hub about a blade rotational axis. The hub includes a spherically-shaped outer surface in a region of the hub swept by the inner surface of the blades when the blades are rotated from maximum to minimum pitch. The hub may also be associated with blades in which the chord is reduced in the root region of the blade. The turbine may also include seals attached to the blade inner surface and an essentially spherically-shaped discharge ring to improve certain turbine parameters such as cavitation, efficiency, flow disturbance, and fish survivability.

Cette invention concerne une turbine hydraulique formée d'un moyeu et d'aubes orientables. Chaque aube comporte une surface intérieure et une surface extérieure, un bord d'attaque et un bord de fuite, séparés par une surface directrice. Chaque aube est monté sur le moyeu de façon à pouvoir tourner autour d'un axe de rotation. Le moyeu présente une surface extérieure sphérique dans une région balayée par la surface intérieure des aubes au pivotement entre la position de pas minimal et la position de pas maximal. Les aubes montées sur le moyeu de la turbine peuvent être à section réduite à l'emplantur. La turbine peut également comporter des joints d'étanchéité à la surface intérieure des aubes et un anneau de sortie essentiellement sphérique destinés à améliorer certains paramètres de fonctionnement : cavitation, rendement, turbulence et survivabilité en milieu poissonneux.

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