Air-oil heat exchanger

A heat exchanger of the air/oil type, for an annular air stream of a turbomachine, comprising a heat exchange zone with oil passages and surfaces of heat exchange surfaces with air, said heat exchange zone forming an axial air passage and having a profile facing the air flow and included in a plane perpendicular to said flow of air, said profile of the heat exchange zone being in a form of an arc so as to be able to be arranged in the annular air stream,

• wherein said heat exchanger comprises on a radially internal or external face of the heat exchange zone, an oil inlet and an oil outlet, the oil passages comprising several paths between said oil inlet and said oil outlet, distributed along the arcuate profile of the heat exchange zone, each of the paths comprising at least one forward portion and at least one return portion, extending radially between the radially internal face and the radially external face, and wherein the at least one forward portion and the at least one return portion of each of the paths are offset along the arcuate profile of the heat exchange zone.