Abstract
A noise controlling device (12) is used for controlling noise in a turbo-fan engine (10). The engine includes an entrance (22) for ingesting air, and a fan rotor (18) connected to a spinner (20) in the interior of the engine. The fan rotor faces the forward side of the engine. A ring (24) is connected to the interior of the engine, with the ring being located between the engine entrance and the forward side of the fan rotor. The inner periphery of the ring faces the spinner, with the ring surrounding the spinner in substantial coaxial alignment therewith. An acoustic lining (26) is disposed around the inner and outer peripheries of the ring.
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