水雾对黏塑性炸药PBXN-5燃烧的抑制作用研究

为研究水雾对自由堆积状态黏塑性炸药PBXN-5粉末燃烧的抑制作用，搭建了开放式燃烧试验装置，选用了粒度范围D₉₈=425 μm的PBXN-5粉末，分别对无水雾、喷水压力为0.5 MPa和2.0 MPa 3种条件下堆积状态PBXN-5的燃烧过程进行了试验，获得了火焰传播过程及火焰温度随时间的分布曲线。结果表明:在水雾喷水压力为0.5 MPa 和2.0 MPa时，堆积状态PBXN-5的燃烧持续时间分别是自由燃烧时的32.6%和31.8%，说明水雾对于PBXN-5燃烧有很好的抑制作用；灭火时间分别为377.011 ms和115.004 ms，而且2.0 MPa时火焰的最高下降速率较0.5 MPa时有所增加，表明对于堆积状态PBXN-5火焰抑制效果来说，雾动量的影响较雾滴粒径强。

Research on Combustion Inhibition of Water Mist on PBXN-5

An open combustion test device was set up to study the combustion inhibition of water mist on the free accumulation state PBXN-5 powder. PBXN-5 powder with particle size ofD₉₈=425 μm was selected to test the combustion processes of accumulated state PBXN-5 under three conditions of no water mist, water mist with spray pressure of 0.5 MPa and 2.0 MPa, respectively. Flame propagation process and distribution curve of flame temperature with time were obtained. Results show that, when the water spray pressures are 0.5 MPa and 2.0 MPa, combustion duration of PBXN-5 in stacked state is 32.6% and 31.8% of that in free combustion respectively, indicating that water mist has a good inhibitory effect on PBXN-5 combustion. When the spray pressure is 0.5 MPa and 2.0 MPa, the extinguishing time is 377.011 ms and 115.004 ms, respectively. And the maximum flame decline rate at 2.0 MPa increases compared with that at 0.5 MPa, which indicates that the fog momentum has a stronger effect on the flame suppression of PBXN-5 in stacked state than the particle size of fog drops.