MUFFLER Russian patent published in 2006 - IPC F01N1/00 

FIELD: mechanical engineering; engines.

SUBSTANCE: invention relates to developing and designing means of damping noise propagated along aerodynamic channels, particularly, along channels with flow having subsonic velocity, for instance noise of fan of aircraft double-flow turbojet engine. According to invention, noise damping in proposed muffler is provided by fitting housing of wall of double-flow turbojet engine enclosing the channel. Aerofoil cascade is arranged in housing space, and air volumes between neighbour profiles of cascade communicate with spaces of housing and channel. Aerofoil cascade can be installed in space of housing flush with channel wall, and width of aerofoil cascade can be made equal to height of housing, or aerofoil cascade can project inwards the channel behind the limits of housing space, and said cascade can be made in radial direction either radial or arranged at angle to radius of channel, and profiles of cascade in axial direction can be arranged parallel to axis of channel or at angle to axis of channel. Moreover, aerofoil cascade can be made with chord variable in height, variable maximum thickness and angle of profile bending.

EFFECT: increased range of noise damping, simplified design of muffler, reduced aerodynamic losses.

10 cl, 23 dwg