The invention belongs to the field of aerodynamic design of hypersonic-speed temporary-flushing wind tunnels, and particularly relates to a wind tunnel device for prolonging the
operation time of a hypersonic-speed temporary-flushing wind tunnel, which comprises a gas
storage tank, and a gas storage section and a spray
pipe which are coaxially arranged, the
tail part of the gas storage section extends into the gas
storage tank and is hermetically communicated; a flow guide cone cylinder and a flow guide cone which are coaxial with the gas storage section are arranged in the gas
storage tank; the front end of the diversion cone extends into the
tail end of the gas storage section; the flow guide cone is fixedly mounted on one side, coaxially opposite to the
tail end of the gas storage section, of the gas storage tank; expansion
waves sequentially pass through the gas storage section and the diversion cone cylinder and reach the diversion cone, and the diversion cone separates the expansion
waves and reflects the expansion
waves to the two sides of the gas storage tank; a gap exists between the tail end of the flow guide conical cylinder and the inner wall of the gas storage tank, and the outer wall of the flow guide conical cylinder and the inner wall of the gas storage tank define a relatively closed
expansion wave dissipation cavity; and the separated
expansion wave reaches the
expansion wave dissipation cavity through the gap and is gradually dissipated. According to the invention, the effective
operation time of the hypersonic speed transient wind tunnel can be effectively prolonged, and the efficiency and
cost performance are high.