摘要
研究了煤炭资源开采过程中诱发的瓦斯爆炸机理及其传播过程中的动力特性,探讨了瓦斯爆炸事故的预防对策.研究结果表明:分叉管路分叉点为一扰动源,会诱导附加湍流;管内设置螺旋环后,原管壁边界层遭到破坏,管壁邻近的气流经过螺旋环时,发生边界层的分离,在分离区形成涡流,使气流湍流度增加;火焰阵面进入螺旋环扰动区后,发生扭曲并产生褶皱,火焰表面积显著增加,燃烧速率增大,并相应增加了释热速率,诱导激波的产生.变断面、巷道分叉及管内设置螺旋环对瓦斯爆炸过程中的火焰和爆炸波传播具有加速作用,诱导湍流的产生,引起爆轰.防止瓦斯爆炸事故扩大的隔爆、抑爆措施的关键在于抑制湍流现象的产生.
Dynamical characteristics of gas explosion and its transmission process during the course of coal resource exploitation were studied, and the preventive measures of gas explosion were discussed. The results show that the tube bifurcation is a perturbing source and can induce additional turbulent flow. After the spiral rings are set up, the original tube boundary layer is destroyed. The boundary layer is separated when the airflow flows through spiral rings, and eddy current is formed in the separated areas, which increases the turbulent degree of the airflow. The flame front is twisted and draped after it enters the spiral rings perturbing area. Flame superficial area, burning speed and heat release rate are increased to induce shock wave. Stumbling blocks, changing section, piping bifurcation and timbering accelerate the gas explosion flame and explosion wave, which induce turbulence and detonation wave. The key measure of insulating and suppressing gas explosion is to prevent turbulence from occurring.
出处
《采矿与安全工程学报》
EI
北大核心
2006年第1期19-23,共5页
Journal of Mining & Safety Engineering
基金
国家自然科学基金资助项目(50534090
50574093)
国家重点基础研究发展计划(2005cb221506)
高等学校博士点专项科研基金
江苏省自然基金重点项目(BK2003215)
关键词
瓦斯爆炸
湍流
螺旋环
爆轰
gas explosion
turbulent flow
spiral ring
detonation wave
