POROUS METAL BODIES USED FOR ATTENUATING AVIATION TURBINE NOISE

摘要

A porous metal body with two opposing main surfaces, able to reduce noise from an aircraft jet engine, has pores (1, 2) in the form of cylindrical channels emerging through the first of their ends into the engine casing and closed at their opposite ends. Each channel has a diameter (D) of between 0.1 and 0.3 mm and is situated, on at least a part of its length, at a minimal distance (e) from its closest neighbour of between 0.02 and 0.3 mm. The ration between the length and the diameter of the channels is of the order of 10 2>. Independent claims are also included for: (1) an aircraft engine casing incorporating a sector made up of this porous body; (2) the fabrication of the porous body.