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

Abstract

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 curve through a data processing method. By using the method of the invention, the measuring device and measuring procedure of the flow characteristic of the nozzle in the inert gas fire-extinguishing system are simplified, the measuring time is shortened, the work efficiency of the measurement is increased, the mechanical error generated in the measuring process is avoided, and the measuring precision is increased.

Description

technical field [0001] The invention relates to a method for measuring an inert gas fire extinguishing system, in particular to a method for measuring flow characteristics of a nozzle of an inert gas fire extinguishing system. Background technique [0002] The nozzle flow characteristics of the inert gas fire extinguishing system describe the relationship between the nozzle gas injection rate and the static pressure of the nozzle during the injection process. At present, the measurement of nozzle flow characteristics is mainly to calculate the flow characteristics of the nozzle by measuring the static pressure at the nozzle inlet and the mass change of the inert gas in the cylinder. Using this method, two parameters are mainly measured, one is to measure the static pressure at the inlet of the nozzle, and the other is to measure the gas mass in the steel cylinder by weighing method, so as to obtain the mass of the gas ejected from the nozzle, and then calculate the Mass Flo...

AI Technical Summary

Problems solved by technology

However, due to the existence of the delivery pipeline, the data collected by the load sensor and the pressure sensor are not synchronized, so there is a relative lag in the data

Since the data measured by the two sensors are not instantaneous synchronous data, the accuracy of the measurement results is also affected accordingly, and the measurement device and measurement procedure are relatively complicated

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