Intentionally frequency mistuned turbine blades
First Claim
1. A rotating disk for a turbine engine having intentionally frequency mistuned turbine blades, comprising:
- a rotating hub,first turbine blades projecting from the circumference of the rotating hub; and
second turbine blades projecting from the circumference of the rotating hub, wherein;
the number of first turbine blades is equal to the number of second turbine blades,the first turbine blades alternate between the second turbine blades,the thickness of the second turbine blades from the mean line between their airfoil root and their airfoil tip to their airfoil tip is greater than the thickness of the first turbine blade from the mean line between their airfoil root and their airfoil tip to their airfoil tip, andthe natural frequency of the second turbine blades is lower than the natural frequency of the first turbine blades.
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Accused Products
Abstract
A new, more economical design for intentionally frequency mistuned turbine blades for more efficient turbine engines is disclosed. A rotating disk of a turbine engine includes first turbine blades that alternate between second turbine blades. The second turbine blades are thicker than the first turbine blades, within manufacturing tolerances, in sections from about their mean line to their airfoil tip. The first and second turbine blades can be cast using two different molds, resulting in an economical manufacturing method. As such, the natural frequency of the second turbine blades is about 3% less than the natural frequency of the first turbine blades. As a result of the intentional difference in natural frequencies of the two different turbine blades, the rotating disk does not experience flutter instability.
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Citations
15 Claims
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1. A rotating disk for a turbine engine having intentionally frequency mistuned turbine blades, comprising:
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a rotating hub, first turbine blades projecting from the circumference of the rotating hub; and second turbine blades projecting from the circumference of the rotating hub, wherein; the number of first turbine blades is equal to the number of second turbine blades, the first turbine blades alternate between the second turbine blades, the thickness of the second turbine blades from the mean line between their airfoil root and their airfoil tip to their airfoil tip is greater than the thickness of the first turbine blade from the mean line between their airfoil root and their airfoil tip to their airfoil tip, and the natural frequency of the second turbine blades is lower than the natural frequency of the first turbine blades. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification