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首页> 外文会议>2009煤矿瓦斯灾害预防与控制国际研讨会(International Symposium on Prevention and Control of Gas Disaster in Coal Mine 2009) >The mechanism of turbulence in mine gas explosion and its preventive measures
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The mechanism of turbulence in mine gas explosion and its preventive measures

机译：煤矿瓦斯爆炸中的湍流机理及预防措施

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摘要

On the basis of research on dynamical characteristics of gas explosion mechanism and its trans mission process during the course of coal exploitation, the preventive measures against gas explosion acci dents are discussed. The result shows that tube bifurcation is a perturbing source which can induces addi tional turbulent flow. After the spiral rings are settled, the original tube boundary layer will be destroyed. When the airflow flows through spiral rings, the boundary layer separates, eddy current will be formed in the separated areas, which increases the turbulent degree of airflow. And when the front flame enters the spiral rings perturbing area, it will twist and produce folds, the flame superficial area will increase signifi cantly. Besides, the burning speed will increase and the heat release rate will increase accordingly, which will induce the arising of shock wave. The effective measure against gas explosion transmission and strength is to cut off the chain reaction timely and avoid occurring turbulence phenomena. Stumbling blocks, changing section, piping bifurcation and timbering will accelerate the gas explosion flame and ex plosion wave, which induces turbulence easily and further leads to detonation wave, even causes the ruin ous destruction of the whole mine ventilation system. So, in order to prevent gas explosion from enlarging, the key measure of insulating and suppressing gas explosion is to prevent detonation wave from occurring, while the key point is to prevent turbulence from occurring.
机译：在研究煤炭开采过程中瓦斯爆炸机理的动力学特征及其传递过程的基础上，探讨了预防瓦斯爆炸事故的措施。结果表明，管分叉是一种扰动源，可以引起附加的湍流。螺旋环沉降后，原始的管边界层将被破坏。当气流流过螺旋环时，边界层分离，在分离的区域中将形成涡流，这会增加气流的湍流度。当前火焰进入螺旋环的扰动区域时，它将扭曲并产生褶皱，火焰的表面区域将显着增加。此外，燃烧速度将增加，并且放热率将相应增加，从而诱发冲击波的产生。防止气体爆炸传递和强度的有效措施是及时切断链式反应，避免发生湍流现象。绊脚石，变化的断面，管道的分叉和木料化会加速瓦斯爆炸的火焰和爆炸波，从而容易引起湍流并进一步导致爆炸波，甚至导致整个矿井通风系统的破坏。因此，为了防止气体爆炸扩大，隔离和抑制气体爆炸的关键措施是防止爆炸波的发生，而关键是防止湍流的发生。

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