Thrust reverser comprising doors forming an upward air deflection opening in the open position

A thrust reverser for an aircraft propulsion assembly, said reverser having a central longitudinal axis and comprising a fixed structure, a lower door and an upper door, the lower door and the upper door each comprising a downstream edge and each being movable with respect to the fixed structure, around a respective axis of rotation, between:

• a closed position wherein the lower and upper doors delimit with the fixed structure a flow conduit, the flow conduit comprising an ejection outlet delimited at least partly by a rear end of the fixed structure, the lower and upper doors in the closed position being configured to be able to guide a fluid flowing in the conduit to its ejection outlet to generate a thrust, and
• an open position wherein the lower and upper doors each release a reversal opening so as to be able to evacuate from the flow conduit a first portion of said fluid, via these reversal openings, and redirect at least a fraction of the fluid thus evacuated towards a front end of the fixed structure in order to generate counter-thrust,
• the downstream edge of the lower door and the downstream edge of the upper door defining, when the lower and upper doors are in the open position, a deflection opening configured to allow a second portion of said fluid to exit the reverser through said deflection opening, said reverser comprising, when the lower and upper doors are in the open position:
• a midpoint of the downstream edge of the lower door is offset along the central longitudinal axis towards the rear by a first distance with respect to a midpoint of the downstream edge of the upper door, these midpoints intersecting a median longitudinal plane perpendicular to said axis of rotation of the lower and upper doors,
• said midpoint of the downstream edge of the lower door is offset in a vertical direction, with respect to said midpoint of the downstream edge of the upper door, towards a distal end of the lower door by a second distance, the vertical direction being perpendicular to the central longitudinal axis and to the axis of rotation of the lower and upper doors,
• the ratio of said second distance and said first distance is comprised between 0.2 and 2.