Method for improving practicability of characteristic curve of annular gap pressure regulating valve of wind tunnel

The invention discloses a method for improving the practicability of a characteristic curve of an annular gap pressure regulating valve of a wind tunnel. A valve front total pressure measuring point and a valve rear total pressure measuring point which are matched with each other are arranged at the end of an air inlet pipeline and a stable section respectively; based on the valve rear total pressure measuring point value, a pressure regulating characteristic curve of the total pressure ratio of the stable section and the wind tunnel air inlet pipeline and the relative position opening degreeof a pressure regulating valve is obtained in a reverse calculation mode; and under the condition that the total pressure of the stable section is given by the target Mach number, the valve position opening degree under different air source pressure conditions is calculated according to the pressure regulating characteristic curve. According to the method for improving the practicability of the characteristic curve of the