Hydraulic turbine with interblade vortex suppressor

F - Mech Eng,Light,Heat,Weapons – 03 – B

Patent

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Details

F03B 3/02 (2006.01)

Patent

CA 2436670

An improved Francis-type turbine runner. To extend operating range to partial load, inter blade fins partially extend into the flow paths between the runner blades. The inter blade fins correspond in shape and pattern with the shape and pattern of that portion of the runner blades with which the fins coextend along the flow paths between blades. The fins are recessed rearwardly of the flow dividing edges of the runner blades in the flow paths between the runner blades and reduce occurrence of inter blade vortices during partial or low load operating conditions. The shape of the interblade fins is further improved by tilting or sloping the tip of the interblade fin towards the suction surface of the adjacent blade. This creates a small convergence in the flow path between the fin and the suction surface of the blade.

Roue de turbine Francis améliorée. Pour élargir la plage de fonctionnement à charge partielle, les plans fixes enter-ailettes se prolongent partiellement dans les voies de passage entre les pales de la roue de turbine. Les formes et les profils des plans fixes inter-ailettes correspondent aux formes et profils de la partie des aubes de la roue de turbine dont les plans fixes se prolongent le long des voies de passage entre les pales. Les plans fixes sont fixés en retrait à l'arrière des rebords diviseurs de débit des pales de la roue de turbine dans les voies de passage entre les pales de la roue de turbine et réduisent l'apparition de tourbillons en conditions de fonctionnement à charge partielle ou faible. La formes des plans fixes inter-ailettes est aussi améliorée par l'inclinaison ou chanfreinage des point du plan fixe inter-ailettes vers la surface d'aspiration de la pale adjacente. Cette solution crée une petite convergence dans la voie de passage entre le plan fixe et la surface d'aspiration de la pale.

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