F - Mech Eng,Light,Heat,Weapons – 03 – B
Patent
F - Mech Eng,Light,Heat,Weapons
03
B
F03B 3/12 (2006.01) F04D 29/18 (2006.01)
Patent
CA 2273257
A hydraulic turbine that in-cludes a turbine runner that reduces fish mortaliy as the fish pass through hydroelectric power stations. The turbine runner includes at least two turbine runner blades included in a corkscrew configuration. Signifi-cantly, the corkscrew blades are ex-ceptionally long in the overall direc-tion of fluid flow through the tur-bine. In accordance with preferred embodiments, fluid flow to the run-ner from the inlet is mixed flow; the fluid flow at the outlet is di-rected substantially axially. In cer-tain highly preferred embodiments of the turbine runner: the ratio of the sum of the leading edge lengths to the runner diameter is less than 1.0, the ratio of each blade run-ning length to the runner diameter is greater than 1.0, the ratio of each blade running length to the respec-tive blade width is greater than 3.0, the ratio of the axial length to the runner diameter is greater than 0.6, and the turbine runner (at its best efficiency point): is at least 80 % efficient and achieves a rate of pres-sure change less than 80 psi/second along substantially the entire length of the runner blades, and the minimum absolute pressure maintained along the main fluid flow path is 4 psia when the trailing edges are located at a tailwater elevation.
La présente invention concerne une turbine hydraulique pourvue d'une roue de turbine réduisant la mortalité des poissons traversant les centrales hydroélectriques. La roue de turbine comporte au moins deux pales de roue de turbine en tire-bouchon. Singulièrement, les pales en tire-bouchon sont exceptionnellement longues par rapport à la longueur totale du passage du fluide au travers de la turbine. Selon des réalisations préférées, l'écoulement du fluide de l'entrée jusqu'à la roue de turbine se fait en flux mixte. Au niveau de la sortie, l'écoulement du fluide se fait sensiblement axialement. Selon certaines réalisations hautement préférées de la roue de turbine, on a ( SIGMA longueurs bords de fuite) / (O roue de turbine) > 0,6, pour un rendement de roue de turbine > 80% au point de rendement optimal. En outre, la vitesse de changement de pression est inférieure à 80 psi/s sur sensiblement la totalité de la longueur des pales de roue de turbine, la pression minimale absolue maintenue dans la longueur de la traînée principale du fluide étant de 4 psia pour des bords de fuite au niveau aval.
Hecker George E.
Jansen Willem
Alden Research Laboratory Inc.
Northern Research & Engineering Corporation
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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