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A portable piston-type water mist fire extinguisher for spacecraft
A new type of water mist fire extinguisher was proposed to be used in the manned spacecraft. The goal of prototype is that it can extinguish class 8B fires on the ground and its mass is less than 2.5 kg. The prototype employed only water as suppression agents. In the extinguisher, a piston separated the water from nitrogen artificially, which dispels the influence of the gravity on discharging. It possesses some advantages, such as high reliability, easy refilling of water and nitrogen, long life span, and convenient maintenance. A pressure-swirl nozzle was employed to produce water mist. There was no part to keep the pressure constant at the nozzle’s entrance; the service pressure of nozzle was determined in the range from 6 to 15 MPa. In that scope, the variation of droplet size with pressure did not have a significant impact on suppression performance, and the suppression time increment due to velocity reduction was in the acceptable level. A series of tests were conducted to verify its performance. The vibration test presented that there was no nitrogen leakage and no obvious resonance happened, which meant it possessed high reliability. The fire suppression tests indicated that it can suppress different fire types of a certain scale. The simulation results showed that the spray performance is improved in the microgravity. Conclusion can be drawn that the prototype is feasible in the microgravity and it reached the requirements of the design.
A portable piston-type water mist fire extinguisher for spacecraft
A new type of water mist fire extinguisher was proposed to be used in the manned spacecraft. The goal of prototype is that it can extinguish class 8B fires on the ground and its mass is less than 2.5 kg. The prototype employed only water as suppression agents. In the extinguisher, a piston separated the water from nitrogen artificially, which dispels the influence of the gravity on discharging. It possesses some advantages, such as high reliability, easy refilling of water and nitrogen, long life span, and convenient maintenance. A pressure-swirl nozzle was employed to produce water mist. There was no part to keep the pressure constant at the nozzle’s entrance; the service pressure of nozzle was determined in the range from 6 to 15 MPa. In that scope, the variation of droplet size with pressure did not have a significant impact on suppression performance, and the suppression time increment due to velocity reduction was in the acceptable level. A series of tests were conducted to verify its performance. The vibration test presented that there was no nitrogen leakage and no obvious resonance happened, which meant it possessed high reliability. The fire suppression tests indicated that it can suppress different fire types of a certain scale. The simulation results showed that the spray performance is improved in the microgravity. Conclusion can be drawn that the prototype is feasible in the microgravity and it reached the requirements of the design.
A portable piston-type water mist fire extinguisher for spacecraft
Jiang, Zhuo (Autor:in) / Liu, Yinshui (Autor:in) / Zhao, Xufeng (Autor:in) / Fang, Wudi (Autor:in)
2015
12 Seiten, 31 Quellen
Aufsatz (Zeitschrift)
Englisch
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