Improved fluid displacing blade

Details Improved fluid displacing blade Improved fluid displacing blade

B - Operations, Transporting

63

H

B63H 1/26 (2006.01) B63H 1/18 (2006.01) B63H 1/28 (2006.01) B64C 11/16 (2006.01)

Patent

CA 2286705

A propeller (11) having five blades (13) supported from a hub (14) is exemplified. The propeller (11) is shown with the faces (15) of those blades (13) facing the viewer (out of the page), and has apertures (19) extending through each blade (13) from the face (15) to the back of each blade (13), and spread relatively evenly across the extent of each blade. The axial extent of the apertures (19) is substantially aligned with the direction of movement of the blades (13) relative to the axis of the propeller (11). The apertures (19) are normal both to the radial extent of the propeller (11) and the axial extent of the propeller. Each aperture (19) includes a bevelled edge in the form of a countersunk lip (21) extending around the periphery, on the face (15). The flow of fluid through the apertures (19) is believed to interfere with turbulent fluid adjacent to the back of the propeller (11), and so lead to improved efficiency of the propeller.

Hélice (11) comportant cinq pales (13) portées par un moyeu (14). Dans la figure, l'hélice (11) est présentée avant (15) des pales (13) face à l'observateur. Des ouvertures (19), qui traversent chaque pale (13) d'avant (15) en arrière (17), sont réparties de manière relativement régulière sur la surface de chaque pale. L'axe de ces ouvertures est sensiblement aligné dans le sens du mouvement des pales (13) par rapport à l'axe de l'hélice (11). Les ouvertures (19) sont perpendiculaires à la fois à la portée radiale de l'hélice (11) et à la portée axiale de l'hélice. Chaque ouverture (19) comporte sur la face avant (15) de la pale, un bord biseauté formant une bordure (21) chanfreinée sur la périphérie de l'ouverture. On pense que le flux de fluide traversant ces ouvertures (19) interfère avec la turbulence du fluide contre la face postérieure de l'hélice (11), améliorant ainsi l'efficacité de l'hélice.

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