Patent ID: 7784270

Claim:
A mixer for mixing inner and outer concentric gas streams in a bypass turbomachine, the mixer comprising a substantially cylindrical member having a substantially sinusoidal portion at its downstream end defining inner lobes and outer lobes distributed around its circumference, each outer lobe having a pair of substantially plane radial walls that are spaced apart from each other in the circumferential direction and that are connected together by an outer curvilinear dome so as to form an outer gutter guiding the inner gas stream radially outwards, each inner lobe comprising a pair of substantially plane radial walls that are spaced apart from each other in the circumferential direction and that are interconnected by an inner curvilinear dome so as to form an inner gutter guiding the outer gas stream radially inwards, the walls of the outer lobes being disposed to extend radially the walls of the inner lobes, wherein the radial walls of a given outer lobe extend radially in directions that are substantially mutually parallel, with these walls when extended defining a zone from which the axis of symmetry of the cylindrical member is excluded.