The invention relates to the technical field of wind tunnel experiments and discloses a three-joint double-support
attack angle mechanism. The three-joint double-support
attack angle mechanism comprises a front support and a rear support which are installed at the bottom of an air
inlet channel model, wherein one end of the front support is fixed to a front end of the bottom of the air
inlet channel model, the other end of the front support is hinged to a fixing rod through a first movable joint, the fixing rod is fixed to a
wall plate at the bottom of a wind tunnel, one end of the rear support is fixed to a rear end of the bottom of the air inlet model, and the other end of the rear support is hinged to a connecting rod through a second movable joint, and an end of the connecting rod is hinged with a push-pull rod driven by a driving mechanism to move up and down. The three-joint double-support
attack angle mechanism is advantaged in that the driving mechanism is used for pushing thepush-pull rod to move up and down to drive an air inlet model to change an attack angle with a first movable joint as the rotating center, the air inlet model can be supported, the attack angle changing function of the air inlet model can be achieved, and an existing attack angle mechanism of a wind tunnel is completely or partially replaced, operation control is simple, cost is low, and a problemthat a traditional attack angle mechanism for the outflow test is easily damaged due to overlarge
aerodynamic load of the inflow test model is avoided.