Heat exchanger fitted with upstream cover to reduce disturbance to fluid flow in a turbomachine

A heat exchanger designed to be fixed to a turbomachine wall delimiting a gas flow stream, said exchanger comprising a body with:

• a front face through which the gas flow passes;
• an attachment face to the wall;
• an external face opposite the attachment face and connected to the front face;
• two lateral faces connected to the front face;
• a cover surrounding the front face, the cover comprising an external portion prolonging the external face and lateral portions prolonging the lateral faces, to delimit an intake with an area smaller than the area of the front face, the intake being located upstream from the front face relative to the gas flow stream, and the intake being delimited by a free external edge of the external portion prolonged by two free lateral edges terminating the lateral portions, and by the turbomachine wall,
• wherein the external portion and the lateral portions are respectively terminated by the free external edge and the free lateral edges forming lips, a thickness of the lip terminating the external portion being greater than a thickness of the lips terminating the lateral portions.