Optimization of turbomachinery harmonics

F - Mech Eng,Light,Heat,Weapons – 04 – D

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F04D 29/66 (2006.01) F01D 25/30 (2006.01) F02C 7/045 (2006.01)

Patent

CA 2237611

A turbomachine assembly (10) includes a number B of circumferentially spaced rotor blades (22), a number V of circumferentially spaced guide vanes (20) axially adjacent to the rotor blades (22), an annular chamber (30) surrounding the rotor blades (22), and an intake (12) and exhaust (24) for receiving and discharging air that passes through the annular chamber (30). When the turbomachine (10) is in operation, spinning mode tones are generated by the interaction of the rotor and guide vanes (22, 20). These tones are minimized by selecting a number of vanes (20) relative to the number of blades (22) so that selected tones propagate axial to the intake and exhaust of the turbomachine. A sound absorptive material (18) is then positioned so that the tones impinge upon it. Moreover, a tuned duct (32) is positioned in the path of the remaining tones. The turning vanes (26), placed within the tuned duct (32), cancel the remaining tones travelling through the duct.

Un ensemble turbomachine 10) comprend un nombre B d'ailettes (22) de rotor espacées de manière circonférentielle, un nombre V d'aubes directrices (20) espacées de manière circonférentielle qui sont axialement adjacentes aux ailettes (22) de rotor, une chambre annulaire (30) prévue autour des ailettes (22) de rotor et des entrées (12) et sortie (24) servant respectivement à laisser entrer et sortir l'air qui traverse la chambre annulaire (30). Quand la turbomachine (10) est en fonctionnement des sons propres au mode de rotation rapide sont générés par l'interaction du rotor et des aubes directrices (22, 20). Pour minimiser ces sons on sélectionne un nombre d'aubes (20) en fonction du nombre d'ailettes (22) de manière à ce que des sons sélectionnées se propagent axialement par rapport à l'entrée et à la sortie de la turbomachine. On place ensuite un matériau insonorisant (18) de sorte que les sons viennent s'y heurter. On place également un conduit accordé (32) sur la trajectoire des sons restants. Les pales (26) en rotation placées dans le conduit accordé (32) suppriment les sons restants qui circulent dans le conduit.

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