Noise reducing attachment for a turbofan engine

摘要

The noise-reducing system is used in the air intake of an aircraft jet engine, especially a fanjet. The interior surface of the intake is covered with a sound-absorbing layer consisting of a thin perforated skin (26) supported on a cellular structure which forms a number of chambers (30) behind the skin. The structure has an external impermeable skin (28) on its forward part which is bolted (40) to an L-section flange (36). The outward-extending part of the flange has bolt holes matching those in a flange on the compressor casing (22). The inner surface of the compressor casing is covered with a cellular structure and a perforated skin similar to that on the air intake.