Mixed tuned hybrid blade related method
First Claim
1. A steam turbine blade comprising a shank portion and an airfoil portion, the airfoil portion formed with at least one pocket, the pocket filled with a polymer filler material chosen as a function of natural frequency impact on the turbine blade.
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Accused Products
Abstract
A steam turbine blade includes a shank portion and an airfoil portion. The airfoil portion is formed with at least one pocket filled with a polymer filler material chosen as a function of natural frequency impact on the turbine blade or as a function of the damping characteristics of the filler materials. A steam turbine rotor wheel includes a plurality of blades secured about a circumferential periphery of the wheel, each blade having one or more pockets in the airfoil portion, the plurality of blades divided into two groups of blades. The pockets of one group of blades are filled with one or more polymer filler materials, and the pockets of the other group of blades filled with one or more polymer filler materials, wherein the polymer filler materials in the one group of blades creates different natural frequencies or damping characteristics in the blades of the one group than the polymer filler materials in the blades of the other group. The two groups of blades are assembled on the rotor wheel in accordance with a predetermined pattern.
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Citations
26 Claims
- 1. A steam turbine blade comprising a shank portion and an airfoil portion, the airfoil portion formed with at least one pocket, the pocket filled with a polymer filler material chosen as a function of natural frequency impact on the turbine blade.
- 7. A steam turbine rotor wheel comprising a plurality of blades secured about a circumferential periphery of the wheel, each blade comprising a shank portion, an airfoil portion and one or more recessed pockets in the airfoil portion, said plurality of blades divided into two groups of blades, the pockets of one group of blades filled with one or more polymer filler materials, and the pockets of the other group of blades filled with one or more polymer filler materials, wherein the polymer filler materials in the one group of blades creates different natural frequencies in the blades of the one group than the polymer filler materials in the blades of the other group, and wherein the two groups of blades are assembled on the rotor wheel in accordance with a predetermined pattern.
- 13. A steam turbine blade comprising a shank portion and an airfoil portion, the airfoil portion formed with plural pockets filled with polymer filler materials chosen as a function of damping characteristics of said polymer filler materials.
- 18. A steam turbine rotor wheel comprising a plurality of blades secured about a circumferential periphery of the wheel, each blade comprising a shank portion, an airfoil portion and one or more pockets in the airfoil portion, said plurality of blades divided into two groups of blades, the one or more pockets of one group of blades filled with first polymer filler materials, and the pockets of the other group of blades filled with second polymer filler materials, wherein the first and second polymer fillers create different damping characteristics in the blades of the one group than the polymer filler materials in the other group, and wherein the two groups of blades are assembled on the rotor wheel in accordance with a predetermined pattern.
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25. A method of suppressing the aero-elastic response of a row of blades on a steam turbine wheel comprising:
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(a) providing a plurality of blades, each having one or more pockets formed therein; and
(b) filling said one or more pockets with one or more filler materials chosen as a function of natural frequency impact on the row of blades.
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26. A method of suppressing the aero-elastic response of a row of blades on a steam turbine wheel comprising:
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(a) providing a plurality of blades, each having one or more pockets formed therein; and
(b) filling said one or more pockets with one or more filler materials chosen as a function of damping characteristics of the one or more filler materials.
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Specification