Stiffness coupling and vibration damping for turbine blade shroud
AssigneeSolar Turbines Incorporated
InventorsLoc Quang Duong, Olivier J. Lamicq
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Abstract
During operation, a bladed rotor disk typically experiences out-of-plane vibration which can result in deterioration and/or cracking at the interface between adjacent shrouds of the turbine blades. In an embodiment, slots are formed at the end of a labyrinth seal segment of each shroud. Preloaded spring strips are inserted through the slots to couple adjacent shrouds while preventing the natural frequency of the turbine blades from drifting to the operating speed range and/or providing vibration damping to the untuned blade mode.
Claims20
A spring strip for vibration damping in a turbine blade, the spring strip comprising:
- a flat portion;
- a curved portion having a first end connected to the flat portion and a second end opposite the flat portion;
- and
- wherein the second end of the curved portion is malleable to bend into a tab in a direction away from the first end of the curved portion.
A turbine rotor assembly comprising:
- a turbine rotor disk;
- and
- a plurality of turbine blades arranged circumferentially around the turbine rotor disk and extending radially from the turbine rotor disk, wherein each of the plurality of turbine blades comprises
- an airfoil, and
- a shroud having a leading edge and a trailing edge opposite the leading edge, wherein the shroud comprises
- a substrate connected to a radially outward end of the airfoil,
- a first labyrinth seal segment extending from the substrate along the leading edge from a first end of the shroud to a second end of the shroud that is opposite the first end of the shroud, wherein the first labyrinth seal segment comprises a first slot at the first end of the shroud, and
- a second labyrinth seal segment extending from the substrate along the trailing edge from the first end of the shroud to the second end of the shroud and parallel to the first labyrinth seal segment, wherein the second labyrinth seal segment comprises a second slot at the second end of the shroud.
Dependencies are inferred from the claim text.