低气压富氧环境对薄壁材料火焰传播速度的影响

Effect of Low Barometric Pressure and Oxygen-Enriched Atmosphere on Flame Spreading Velocity over Thin Materials

通过模拟高原低气压环境,研究富氧环境下火焰沿薄壁材料表面传播速度的变化情况.研究表明,大气压力不变时,氧气体积分数越大,火焰传播速度越快;氧气体积分数不变时,火焰传播速度随着大气压力的增大而加快;维持氧分压为一定值时,大气压力越大火焰传播速度越小.大气压力为1 01.3 kPa、氧气体积分数分别为20.9%和23%时,火焰沿薄壁材料表面的传播速度为2.47 mm/s和3.01 mm/s,参照此速度得出了在不同大气压力下,火焰传播速度为2.47 mm/s和3.01 mm/s时对应的氧气体积分数.

The phenomenon of flame spreading over thin materials under low barometric pressure and oxygen-enriched atmosphere was studied experimentally.The experimental results show that under a certain barometric pres-sure, the greater the oxygen volume fraction is, the faster the flames spread; when the volume fraction of oxygen is constant,the flame spreading velocity increases with the increase of barometric pressure;the flame spreading velocitydecreases with the increase of barometric pressure under a constant partial pressure of oxygen. When the oxygen vol-ume fractions were 20.9% and 23 % at 101.3 kPa, the flame spreading velocities were 2.47 mm/s and 3.01 mm/s, respectively, according to which the corresponding oxygen volume fractions in different barometric pressures were obtained.