Propfan assembly
First Claim
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1. A propfan assembly comprising:
- a plurality of blades;
at least one inner cavity within each of the plurality of blades, wherein the at least one inner cavity extends longitudinally a length greater than a thickness of a corresponding one of the plurality of blades;
a plurality of openings within each of the plurality of blades for communicating noise energy with the at least one inner cavity; and
a noise attenuation structure disposed within the inner cavity.
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Abstract
A propfan assembly includes a plurality of blades that each include an internal cavity containing a noise attenuation structure. Acoustic energy is communicated to the internal cavity through a plurality of openings in the blade surfaces. The cavities include features for attenuating noise energy to reduce generation of noise emitted from the propfan assembly.
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Citations
11 Claims
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1. A propfan assembly comprising:
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a plurality of blades; at least one inner cavity within each of the plurality of blades, wherein the at least one inner cavity extends longitudinally a length greater than a thickness of a corresponding one of the plurality of blades; a plurality of openings within each of the plurality of blades for communicating noise energy with the at least one inner cavity; and a noise attenuation structure disposed within the inner cavity. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A blade configured for rotation about an axis for a propfan assembly comprising:
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an internal cavity disposed within the blade, wherein the internal cavity extends longitudinally a length greater than a thickness of the blade, a plurality of openings within the blade that communicate noise energy with the internal cavity; and a noise attenuation structure disposed within the internal cavity. - View Dependent Claims (8, 9, 10, 11)
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Specification