柴油的抛撒成雾及燃爆特性研究

Cloud Character in Explosion Dispersion and Combustion Feature of Diesel

为了研究柴油、阻燃柴油、阻燃抑爆柴油的抛撒成雾及燃爆特性,使用高速摄像系统记录云雾形成过程,采用红外热成像系统记录火球演变情况。研究表明:在中心药柱爆轰驱动下,油料液滴与空气快速混合形成云雾,其尺寸随油料运动黏度的增大而减小;3种柴油形成的云雾均在二次引爆后产生火球,阻燃柴油的火球最高温度较柴油低35%,阻燃抑爆柴油较阻燃柴油低23%;阻燃柴油的火球最大直径和高度较柴油小54%、42%,阻燃抑爆柴油较阻燃柴油小46%、55%;火球持续时间,阻燃柴油较柴油短38%,阻燃抑爆柴油较阻燃柴油短47%。说明在抑制火球温度上升和尺寸增长的效果上,阻燃抑爆柴油优于阻燃柴油,阻燃柴油优于柴油。

In this study,the dispersion,cloud forming process and combustion explosion properties of diesel,combustion retardant diesel and explosion suppression diesel were investigated.A high-speed video camera system was employed to record the process of cloud forming,and an infrared thermal imaging system to record the fireball evolution process.The results show that under the driving force of shock wave from the center initiation explosive,the diesel droplets mix with air rapidly to form cloud.The size of cloud decreases as the kinematic viscosity of diesel increases.Afterwards,fireball appears after the secondary initiation.The highest fireball temperature of combustion retardant diesel decreases 35% compared with diesel,and that of explosion suppression diesel decreases 23%compared with combustion retardant diesel.The maximum fireball diameter and height of combustion retardant diesel reduce 54%and 42%respectively compared with diesel,and those of explosion suppression diesel reduce 46%and 55%respectively compared with combustion retardant diesel.The fireball duration of combustion retardant diesel shortens 38%compared with diesel and that of explosion suppression diesel shortens 47% compared with combustion retardant diesel.Therefore,explosion suppression diesel is better than combustion retardant diesel and combustion retardant diesel is better than diesel in preventing temperature and size growth of fireballs.