Abdominal support device, assembly and system for high-speed wind tunnel test of wing body fusion aircraft

The embodiment of the invention discloses an abdominal support device, an assembly and a system for a high-speed wind tunnel test of a wing body fusion aircraft. The abdominal support device comprisesa first supporting rod which is fixed at the upper end part of the first supporting rod to the belly part of the wing body fusion aircraft, and extends downwards from the belly part of the wing bodyfusion aircraft; and a second supporting rod, the front end part of the second supporting rod is connected to the lower end part of the first supporting rod. The second supporting rod extends backwards from the lower end part of the first supporting rod. The cross section of the first supporting rod in the horizontal plane is in the shape of a symmetrical wing section which is symmetrical about the axis extending in the airflow flowing direction in the high-speed wind tunnel. The direction from the front edge of the symmetrical wing section to the rear edge of the symmetrical wing section is the same as the airflow flo