Anti-sound arrangement for multi-stage blade cascade
First Claim
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1. In a first blade row and a second blade row, each row including a plurality of individual blades and further having a flow of gas sequentially therethrough, said first and second rows having a relative motion therebetween wherein a plurality of wake velocity variations extending downstream of the individual blades of the first row are periodically encountered by each blade in the second row, the improvement comprising:
- a plurality of acoustic sources disposed on an exterior surface of each blade in the second row, each acoustic source located correspondingly similarly on each second row blade.
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Abstract
An arrangement for cancelling unwanted noise generated by sequential blade rows (16, 18) in a gas turbine engine (10) includes a plurality of acoustic sources (52) disposed on the blades (36-42) of the downstream row (18).
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5 Claims
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1. In a first blade row and a second blade row, each row including a plurality of individual blades and further having a flow of gas sequentially therethrough, said first and second rows having a relative motion therebetween wherein a plurality of wake velocity variations extending downstream of the individual blades of the first row are periodically encountered by each blade in the second row, the improvement comprising:
a plurality of acoustic sources disposed on an exterior surface of each blade in the second row, each acoustic source located correspondingly similarly on each second row blade. - View Dependent Claims (2, 3, 4, 5)
Specification