LOW NOISE AEROENGINE INLET SYSTEM

摘要

An aeroengine has an inlet system which includes at least one deformable wall disposed adjacent a peripheral wall of an inlet duct and a plurality of acoustic cells attached to a back side in fluid communication through respective holes in the at least one deformable wall with an inlet duct air flow. The at least one deformable wall selectively forms part of the peripheral wall of the inlet duct when in an undeployed position and selectively forms a curved profile projecting into the inlet duct to reduce line-of-sight noise propagation through he inlet duct.

主权项

1. An aeroengine having a compressor inlet comprising an inlet duct for directing an air flow to a compressor, and at least one deformable wall providing a portion of a peripheral wall of the inlet duct and deformable between an undeployed and a deployed position, the at least one deformable wall having a first surface exposed to the air flow and a second surface opposite to the first surface, a plurality of acoustic cells being attached to the second surface of the at least one deformable wall, the at least one deformable wall having a plurality of holes extending therethrough from first to second surface and being in communication with the respective acoustic cells, the at least one deformable wall in the undeployed position being shaped as part of the peripheral wall to substantially avoid interfering with the air flow through the inlet duct, and the at least one deformable wall in the deployed position being deformed to project into the inlet duct to reduce an effective cross-sectional area of the inlet duct to reduce line-of-sight noise propagation.