爆炸冲击波扬尘过程中的颗粒动力学特征  

Dynamic parameters of dust lifting process behind shock waves

作　　者：林柏泉[1,2] 孙豫敏[1,2] 朱传杰[1,2] 江丙友[1,2] 刘谦[1,2] 洪溢都[1,2] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《煤炭学报》2014年第12期2453-2458,共6页Journal of China Coal Society

基　　金：国家自然科学基金青年科学基金资助项目(51204174);中央高校基本科研业务费专项资金资助项目(2012QNB01)

摘　　要：为研究爆炸扬尘过程中粉尘颗粒的运动特征,通过纹影仪以及高速摄像机,对粉尘的运动轨迹及其水平、纵向速度进行了分析。结果表明:粉尘颗粒的运动轨迹大体呈抛物线型,其上升过程中受到重力、气流曳引阻力等的作用,速度逐渐降低直至峰值高度,随后在重力作用下沉于管道底部;水平速度vx和纵向速度vy的发展趋势都可用指数函数描述;一定压力下,颗粒的初始位置对其轨迹有影响;冲击波前方的颗粒,受前方粉尘层的阻碍以及冲击波压力损失的影响,上扬过程较缓慢,最大扬尘高度减小,扬尘距离增大;此外,扬尘距离、vx和vy随压力的增大而增大,而最大扬尘高度减小。In order to find out the movement characteristics of dust particles,a schlieren system and a high-speed camera were used to study the pathway of dust particles and its horizontal and vertical velocity. The results show that the pathway of dust particles has a parabola shape,which rises under the function of gravity and air-drag. The particle velocity decreases before it reaches its peak height during this process. Then the particle settled down at the bottom of pipes under gravity. The development trend of the horizontal velocity vx,and the vertical velocity vy,can be described as exponential function. The initial positions of particles have a certain influence on its pathway under different pressures. The rising process of particles is slower before shock wave in the front of dust layers due to the block of dust layers and pressure loss of shock waves. The height of dust lifting decreases with the increase of distance. In addition,the dust lifting distance,vxand vyincreased with the pressure,while the dust lifting heights decrease.

关 键 词：瓦斯 爆炸 粉尘颗粒 扬尘 

分 类 号：TD712[矿业工程—矿井通风与安全] TD714