Turbine wheel with untuned blades comprising a damping device

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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Details

F01D 5/16 (2006.01) F01D 5/14 (2006.01) F01D 5/22 (2006.01)

Patent

CA 2757172

The present invention relates to a turbine wheel (10) comprising: - a plurality of first blades (20) and a plurality of second blades (22), at least one of the first blades being adjacent to at least one of the second blades; a disc (12) having an axis of rotation, at a periphery of which the blades are mounted, each of the blades having a tip secured to a root engaged in a housing (16) opening at the periphery of the disc, each of the blades comprising a polarizing means consisting of a ledge positioned between the tip and the root of the said blade, the ledges of the first blades (20) having an azimuthal length (L1) different from the azimuthal length (L2) of the ledges of the second blades (22); a damping device (30) positioned at least between the said two adjacent blades, the said damping device being positioned between the ledges of the blades (20, 22) and the periphery of the disc (12); the mass of the roots (22b) of the second blades (22) is less than the mass of the roots (20b) of the first blades (20) while the profiles of the tips (20a, 22a) of the first and second blades are identical, the result of this being that the resonant frequency of the first blades is different from the resonant frequency of the second blades, and the second blades (22) are engineered to break before the first blades (20) if the turbine wheel begins to overspeed.

La présente invention concerne une roue de turbine (10) comprenant : - une pluralité de premières pales (20) et une pluralité de secondes pales (22), au moins l'une des premières pales étant adjacente à au moins l'une des secondes pales; un disque (12), présentant un axe de rotation, à une périphérie duquel sont montées les pales, chacune des pales ayant une tête solidaire d'un pied engagé dans un logement (16) s' ouvrant à la périphérie du disque, chacune des pales comportant un détrompeur constitué par une tablette disposée entre la tête et le pied de ladite pale, les tablettes des premières pales (20) présentant une longueur azimutale (L1) différente de la longueur azimutale (L2) des tablettes des secondes pales (22); un dispositif d'amortissement (30) disposé au moins entre lesdites deux pales adjacentes, ledit dispositif d'amortissement étant disposé entre les tablettes des pales (20, 22) et la périphérie du disque (12); la masse des pieds (22b) des secondes pales (22) est inférieure à la masse des pieds (20b) des premières pales (20) tandis que les profils des têtes (20a, 22a) des premières et secondes pales sont identiques, par quoi la fréquence de résonance des premières pales est différente de la fréquence de résonance des secondes pales, et les secondes pales (22) sont dimensionnées pour casser avant les premières pales (20) dans le cas où la roue de turbine part en survitesse.

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