Methods and apparatuses for integrated noise control and flow control in an aircraft environmental control system

摘要

Aircraft, environmental control systems, and air diffusers that may be used to create a quiet, comfortable environment within an aircraft cabin are disclosed. The air diffusers include a duct, a grille, and a porous flow conditioner positioned at least partially within an outlet plenum of the duct. The porous flow conditioner is configured to create backpressure and to reduce a velocity of air flowing out of the porous flow conditioner, relative to air flow unaffected by the porous flow conditioner. The porous flow conditioner may be configured to reduce noise generated by air flow through the air diffuser assembly, relative to air flow unaffected by the porous flow conditioner. The porous flow conditioner may be configured to reduce noise generated by air flow downstream of the porous flow conditioner.

主权项

1. A quiet cabin air diffuser assembly comprising:
a duct having a duct inlet, a duct outlet downstream of the duct inlet, and an outlet plenum at least partially defined by the duct outlet; a grille having a diffuser exit and a grille inlet upstream of the diffuser exit, wherein the grille is coupled to the duct outlet with the grille inlet facing the duct outlet and the outlet plenum; and a porous flow conditioner positioned at least partially within the outlet plenum and transverse to air flow through the quiet cabin air diffuser assembly, wherein the porous flow conditioner spans at least 50% of an open area of the outlet plenum and at least partially defines an open channel in the outlet plenum that spans at least 10% of the open area of the outlet plenum; wherein the porous flow conditioner is configured to create backpressure in the duct and to reduce a velocity of air flowing out of the porous flow conditioner toward the diffuser exit relative to a velocity of air flow unaffected by the porous flow conditioner, and wherein the porous flow conditioner is configured to reduce noise generated by air flow through the quiet cabin air diffuser assembly relative to noise generated by air flow unaffected by the porous flow conditioner.