Natural frequency tuning of gas turbine engine blades

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

Patent

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F01D 5/14 (2006.01) F01D 5/16 (2006.01) F01D 5/30 (2006.01)

Patent

CA 2566527

A gas turbine engine blade (32), such as a swept fan blade, having a tuning notch (50) machined in the back of a blade root (42) between a platform (40) and dovetail (44). Proper sizing and location of the notch allow for the natural frequency of the blade to be modified. In this way, the notch can be designed to alter the natural frequency of the blade so as to avoid coincidence with the known aerodynamic excitation frequencies while not effecting blade aerodynamics. An associated method of tuning the natural frequency of a gas turbine blade is also disclosed.

Une aube de turbine à gaz (32) telle qu'une aube de soufflante à aubes variables comporte une encoche de réglage (50) usinée dans la partie arrière, à la racine (42) de l'aube, entre une plate-forme (40) et une queue d'aronde (44). Le choix approprié des dimensions et de l'emplacement de l'encoche permettent de modifier la fréquence naturelle de l'aube. De cette manière, l'encoche peut être conçue pour modifier la fréquence naturelle de l'aube de façon à éviter toute coïncidence avec des fréquences d'excitation aérodynamique sans affecter pour autant l'aérodynamique de l'aube. L'invention concerne aussi un procédé correspondant de réglage de la fréquence naturelle de l'aube d'une turbine à gaz.

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