Patent ID: 11873763
Assignee: SAFRAN AIRCRAFT ENGINES
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. An acoustic treatment grid mounted inside or at an outlet of a duct of a bleed valve of a turbomachine of an aircraft to convey a gas flow, the grid comprising a perforated plate and circular orifices traversing the perforated plate along a first direction, the orifices having a diameter and a geometrical center,
wherein each orifice is separated from an adjacent orifice by a space, a length of which is equal to the product of the diameter of said orifice and a spacing coefficient of a value between 1.1 and 6 to minimize noise, while ensuring an operability of the bleed valve,
wherein the perforated plate comprises, with respect to the gas flow intended to traverse the perforated plate, an upstream face intended to receive the gas flow and a downstream face, opposite the upstream face, from which the gas flow is intended to escape, the grid further comprising a layer of porous material disposed on said downstream face of the perforated plate without covering the orifices of the perforated plate.