Acoustic muffler for turbine engine

An acoustic muffler comprising:

• an outer shell of tubular configuration, the shell having a side wall encircling a longitudinal central axis of the shell wherein a middle portion of the side wall of the shell is formed as a substantially cylindrical structure, and the side wall includes forward and aft portions respectively joined to forward and aft ends of the middle portion, the forward and aft portions each extending radially inwardly from the middle portion to a radially inner end;
• a tubular liner disposed within the shell, a generally annular space defined between the liner and the side wall of the shell, wherein the radially inner ends of the forward and aft portions being joined to the liner;
• and
• a plurality of dividing walls extending between the liner and the outer shell so as to divide the generally annular space into a plurality of chambers circumferentially spaced about the muffler, wherein at least some of the chambers extend only partially circumferentially about the liner, and wherein each chamber extends longitudinally from the forward portion of the side wall to the aft portion of the side wall;
• wherein a longitudinal central axis of the liner is radially offset from the longitudinal central axis of the shell such that the chambers have different depths in a radial direction of the muffler, the liner having at least one opening into each chamber.