GAS-GUIDING PIPE COMPRISING A NOISE-ATTENUATING COVERING WITH VARIABLE POROSITY

摘要

The invention relates to a noise-attenuating covering intended for a pipe (10) for guiding gases along a gas path (V). Said covering comprises a wall (12) defining the gas path (V) and at least one resonance cavity (13), the wall (12) being pierced with holes (18) for fluid communication between the gas path (V) and the resonance cavity (13) in order to attenuate the noise. The invention is characterised in that the holes (18) have substantially identical diameters and in that, since said pipe (10) is arranged to guide the gases in the downstream direction, the number of said openings (18) per wall surface unit (12) decreases continuously along the gas path (V) in the downstream direction, such as to confer on said wall (12) substantially constant acoustic resistance along said gas path (V), for which the noise attenuation is optimised along the gas path (V).