Sub-transonic-velocity variable-angle-of-attack direct-connection wind tunnel test supporting system and design method

The invention discloses a sub-transonic variable attack angle inlet direct connection wind tunnel test supporting system and a design method, and relates to the field of high-speed aerodynamic test equipment design, and the system comprises a variable attack angle supporting platform which is connected with a launching mechanism frame of a wind tunnel; the model supporting device and the engine pedestal are arranged above the variable attack angle supporting platform; the variable attack angle supporting platform comprises a fixed frame and a movable frame installed in the fixed frame. A mounting hole I and a mounting hole II are correspondingly formed in the center positions of the movable frame and the fixed frame respectively, angle changing plates with multiple groups of adjusting holes are arranged on the two sides of the movable frame and the two sides of the fixed frame respectively, and the movable frame and the fixed frame are fixed through three long pin shafts penetrating through the mounting holes