Method for measuring nozzle flow characteristic of inert gas fire-extinguishing system

The invention relates to a method for measuring the flow characteristic of a nozzle of an inert gas fire-extinguishing system. The method comprises the following steps: (1) arranging a static pressure, dynamic pressure or total pressure sensor and a temperature sensor on the same section of the upstream pipe of the nozzle to measure the static pressure, dynamic pressure or total pressure and the temperature; (2) measuring and calculating the sectional area of the pipe and the area of the nozzle exit at the pressure-measuring point; (3) substituting the measured static pressure, dynamic pressure or total pressure, the temperature, the sectional area of the pipe and the area of the nozzle exit into the flow calculation formula of the extrusive gas of the nozzle to calculate the Q value; (4) substituting the flow Q value into the spraying rate calculation formula to calculate the phi value; and (5) adopting the spraying rates of the nozzle at different spraying static pressures to draw a flow characteristic curv