Ejection-drive closed-loop backflow pulse-type transonic wind tunnel flow field control method

The invention discloses an ejection-drive closed-loop backflow pulse-type transonic wind tunnel flow field control method. An ejector passing by a diffusion segment is taken as the main drive of a wind tunnel flow field, and stable subsonic and transonic flow fields are built under the cooperation of a backflow regulating valve, an auxiliary air incoming pressure-regulating valve, an exhaust throttle and a gate finger. The method achieves the precise control of the total pressure of a stable segment under the joint action of an ejector pressure regulating valve and the auxiliary air incoming pressure-regulating valve, and can achieve the precise control of any given value M under the same total pressure in a subsonic and transonic speed range under the cooperation with a gate finger systembased on the above. According to the invention, a conventional blow-down pulse-type wind tunnel is upgraded to a sucking-type pulse-type wind tunnel, thereby facilitating the reduction of the impacton the dynamic flow field