Retractable diffuser for supersonic wind tunnel

The present utility model provides a retractable diffuser for supersonic wind tunnel and adopts the following technology scheme: the retractable diffuser for supersonic wind tunnel comprises a collecting port, an expansion segment, an internal cylinder, an outer cylinder, a sealing ring, an oil cylinder and a driving rod. The internal cylinder and the outer cylinder are cylinders with two ends open, one end of the internal cylinder is tightly connected with the collecting port, another end is inserted into the outer cylinder, the space between the outer wall of the internal cylinder and the inner wall of the outer cylinder is sealed with the sealing ring, the other end of the outer cylinder is tightly connected with the expansion segment, the driving rod is fixed on the outer wall of the collecting port, the oil cylinder is connected with the driving rod, and under the driving of the oil cylinder, the collecting port and internal cylinder are driven by the driving rod to move back and forth relative to the outer cylinder, The diffuser can conveniently adjust the distance between an diffuser inlet and a jet pipe outlet, and adapt needs of supersonic wind tunnel testing in different states.