Francis turbine

Details Francis turbine Francis turbine

F - Mech Eng,Light,Heat,Weapons

03

B

F03B 3/12 (2006.01)

Patent

CA 2500837

The invention relates to a Francis turbine and a hydraulic turbine comprising one such Francis turbine. The inventive Francis turbine comprises a ceiling, a belt and blades (2) which extend between the ceiling and the belt and which define liquid flow channels therebetween. The ratio (e/L) of the maximum thickness (e) of each blade (2) to the average developed length (L) of the average fibre (23) thereof is between 0.1 and 0.2. According to the invention, over essentially the entire height of the leading edge (21), said average fibre (23) is oriented along a straight line (.DELTA.¿23?) which forms an angle (.alpha.) greater than 90· in relation to the linear feed speed (U) of the leading edge (21) of the blade (2).

Cette roue de type Francis comprend un plafond, une ceinture et des aubes s'étendant entre le plafond et la ceinture, ces aubes (2) définissant entre elles des conduits d'écoulement de liquide. Le rapport (e/L) de l'épaisseur maximum (e) de chaque aube (2) sur la longueur développée moyenne (L) de sa fibre moyenne (23) est compris entre 0,1 et 0,2. Cette fibre moyenne (23) est orientée, sur sensiblement toute la hauteur du bord d'attaque (21), selon une droite (D23) faisant un angle (a) supérieur à 90~ par rapport ô la vitesse linéaire d'avance (U) du bord d'attaque (21) de l'aube (2).

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