Development and Application of Special Extinguishing Agent Concentration Measurement

It is necessary to measure the situation of extinguishing agent concentration along with time in the ground simulation test of helicopter/airplane powerplant. The principle that the different percentage of agent in the air has different flow resistances when these agents passing through some porous plug is used, the relation of agent concentration and flow resistance is researched and confirmed by the calibration. The special extinguishing agent concentration measurement is developed, and used in the ground simulation test of several helicopters. The results show that, the measurement has sensitive response, can reflect the varying situation of extinguishing agent concentration in real-time, and satisfy the requirement of ground simulation test in the fire extinguisher system of helicopter/airplane powerplant.