水雾对RDX粉尘爆炸的抑制作用

Inhibition effect of water mist on RDX dust explosion

为研究水雾对RDX粉尘爆炸的抑制作用,自主设计了可视化方管粉尘爆炸水雾抑制系统,选择了不同喷嘴类型、喷孔直径以及雾化压力等实验条件,以RDX粉尘爆炸火焰传播动态、爆炸压力以及爆炸温度等变化,判断不同条件下水雾对RDX粉尘爆炸特性的影响。结果表明:在同一雾化压力下,不同类型喷嘴喷出水雾对RDX粉尘爆炸抑制效果不同,离心喷嘴喷出水雾抑爆效果最好;随着雾化压力增大,水雾对RDX粉尘爆炸抑制作用增强;在实验选用的0.8、1.2、1.5、2.0、2.4 mm五种孔径离心喷嘴中,1.5 mm孔径离心喷嘴喷出水雾抑爆效果最佳,在雾化压力4 MPa下,RDX粉尘爆炸压力仅为0.1184 MPa,相比于无水雾时RDX粉尘爆炸压力0.4561 MPa,压力峰值降低了74.0%,爆炸温度为234℃,相比于无水雾时RDX粉尘爆炸温度774℃,温度峰值降低了69.8%。

A visual square tube water mist suppression system was independently designed in order to study the inhibition effect of water mist on RDX dust explosion.The system is composed of closed explosion chamber,powder spraying system,ignition system,high-speed photography system,water mist generation system,data acquisition system and time control system.The automatic control of powder injection and ignition is carried out by the time control system.Various experimental conditions such as different nozzle types,nozzle diameters,and atomization pressures were selected.The effect of water mist on RDX dust explosion characteristics was evaluated by comparing the changes in flame propagation dynamics,explosion pressure,and explosion temperature of RDX dust explosion.The results show that the explosion pressure,and temperature of RDX dust clouds increase with the increase of explosive mass.The inhibition effect of water mist on RDX dust explosions varies with different types of nozzles at the same atomization pressure.The water mist sprayed by centrifugal nozzle has the best explosion inhibition effect,and the spiral nozzle has the worst explosion inhibition effect.As the atomization pressure increases,the explosion inhibition effect of water mist enhances.The water mist sprayed by centrifugal nozzle with diameter of 1.5 mm shows the optimal explosion inhibition effect among the five centrifugal nozzles with diameters of 0.8,1.2,1.5,2.0,and 2.4 mm used in the experiment.The explosion pressure and temperature attenuation of water mist on RDX dust explosion increased with the increase of spray pressure.The explosion pressure of RDX dust is only 0.1184 MPa at an atomization pressure of 4 MPa.the peak pressure is reduced by 74.0%compared to the situation without water mist where the explosion pressure of RDX dust is 0.4561 MPa.The explosion temperature is 234℃,which is 69.8%lower than the explosion temperature of RDX dust without water mist (774 ℃).