Study on Combustion Properties of Aviation Carpet under Low Ambient Pressure

低压条件下航空地毯燃烧特性研究

College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Guanghan 618307, China

Received: 5 March 2019

Abstract

The flame-retardant materials in the cabin of civil aircraft is possible to induce fire accident, which can cause certain threat to the operation safety of aircraft. The cabin pressure of civil aircraft is generally maintained at 75~84 kPa under normal transport condition, and the combustion behavior of aviation carpet will change under this pressure. Combustion properties of an aviation carpet, selected from civil aircraft, were studied at Guanghan City (520 m altitude) and Kangding airport (4290 m altitude), Sichuan province of China in this work, respectively. The results showed that the smoke density of the aviation carpets increased sharply and the decreasing rate of the oxygen volume fraction became more quickly under low pressure. Furthermore, the rising rate of carbon dioxide volume fraction also became rapidly with the decrease of the ambient pressure. The content of the carbon monoxide under low pressure was lower than that under normal pressure at the beginning of the combustion. However, the carbon monoxide production increased sharply when the combustion lasted for 4 minutes. In addition, the ignition time of the aviation carpet was shorter under low pressure.

摘要

民用飞机舱内阻燃材料的火灾危险性对客机的安全运行造成了一定的威胁。正常运输条件下民用飞机客舱压力一般维持在75~84 kPa，该压力下航空地毯的燃烧行为将发生变化。以民用客机地毯为实验材料，分别在四川广汉（海拔520 m）和康定机场（海拔4 290 m）开展实验，研究低压环境下航空地毯的燃烧特性。结果表明，低压环境下航空地毯的烟密度大幅升高，氧体积含量下降速度更快，CO₂含量上升速度增加。燃烧开始时CO含量小于常压，但在4.00 min后生成量急剧增加。此外，低压环境下航空地毯的点燃时间更短。