ACOUSTIC ABSORPTION CELL FOR TURBOJETACTOR AND ASSOCIATED ACOUSTIC TREATMENT PANEL

摘要

An acoustic absorption cell (1) intended to be mounted on a wall of a turbojet engine in contact with a fluid flow, the cell (1) comprising a resonant cavity (2) having a wall (30) provided with at least one an orifice (4) associated with a neck (5) comprising a tube (51) extending inside the resonant cavity (2) projecting from said wall (30). The neck (5) further comprises a tubular ring (52) coaxial with the tube (51) and movable relative to said tube (51), and the cell (1) comprises means (6) for moving the ring (52). ) along the tube (51), and means (7) for controlling the displacement means (6) configured to control the displacement of the ring (52) along the tube (51) as a function of the operating speed of the turbojet engine between at least first and second positions respectively defining first and second resonant frequencies of the resonant cavity (2).