20L近球形容器中甲醇喷雾液滴爆炸特性实验研究*

为了评估易燃液体喷雾的爆炸风险，借助喷雾粒度仪、高速相机以及喷雾爆炸实验系统，围绕2种粒径(表面积平均粒径:2.0 μm±0.5 μm;18.0 μm±0.5 μm)的甲醇喷雾，研究点火位置和延迟时间等因素对甲醇喷雾爆炸特性的影响。结果表明:甲醇喷雾粒径均随环境温度的增加而减小，当甲醇喷雾浓度较大时，环境温度对于甲醇喷雾粒径的影响更为显著;甲醇物料温度的改变对于其粒径的影响很小。随着点火延迟时间的增大，甲醇喷雾爆炸特性参数均呈现先增加后减小的趋势，在τ=120 ms时最大。受限空间内甲醇喷雾采用中心或上部点火方式，当甲醇喷雾浓度为356.4 g/m3(φ=1.8)时，甲醇喷雾爆炸特性参数均取得最大值；与上部位置点火相比，中心位置点火的甲醇喷雾爆炸特性参数值较大。

Experimental study on explosion characteristics of methanol spray droplets in 20 L near-spherical container

In order to evaluate the explosion risk of flammable liquid spray,by means of spray particle size analyzer,high-speed camera and spray explosion experimental system,the influence of ignition location,ignition delay time and other factors on the explosion characteristics of the methanol spray were studied regarding the methanol spray with two kinds of particle sizes (surface area average particle size: 2.0±0.5 μm;18.0±0.5 μm).The results showed that the particle size of methanol spray decreased with the increase of the ambient temperature.When the concentration of methanol spray was larger,the influence of ambient temperature on the particle size of methanol spray was more significant.The change of methanol material temperature had little effect on its particle size.With the increase of the ignition delay time,the explosion characteristic parameters of methanol spray increased first and then decreased,which reached the maximum value at τ=120 ms.When adopting the central or upper ignition method on the methanol spray in the confined space,all the explosion characteristic parameters of methanol spray reached the maximum values.Compared with the ignition at upper part,the explosion characteristic parameters of methanol spray were larger when adopting the central ignition.