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Propagation of gas explosions of different volumes in a large test tunnel
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects ( IF 2.9 ) Pub Date : 2020-11-26 , DOI: 10.1080/15567036.2020.1851318
Runzhi Li 1 , Rongjun Si 1 , Lei Wang 1, 2
Affiliation  

ABSTRACT

With the continuous development of coal science and technology, gas explosion disasters have become an important factor in restricting efficient and intensive coal mining which threaten safe production in coal mines. In a large test tunnel, gas explosion propagation tests were conducted by taking gas-air mixtures with different volumes of 50 m3, 100 m3, and 200 m3 as explosion sources. The results demonstrate that, at a given gas concentration, the larger the volume of the gas-air mixture, the stronger the explosive power and the further the flame propagates. The pressure near the explosion source does not necessarily the maximum value in the whole gas explosion process. In the increasing propagation distance, explosion pressure does not linearly attenuate but fluctuates along the tunnel. The flame propagation velocity increases and then decreases throughout the explosion in three stages: a slow propagation stage at the beginning of an explosion, an accelerated propagation stage, and a decelerated propagation stage before flame extinction. Shock waves generated by a gas explosion interact and influence explosion flames and there is a positive feedback mechanism that promotes their mutual interaction. The conclusions provide an important theoretical basis for preventing gas explosion accidents and formulating active measures for explosion suppression in underground coal mines.



中文翻译:

在大型测试隧道中传播不同体积的瓦斯爆炸

摘要

随着煤炭科学技术的不断发展,瓦斯爆炸灾害已成为制约高效,密集采煤的重要因素,严重威胁着煤矿的安全生产。在一个大的测试隧道,瓦斯爆炸传播的测试通过取气体-空气混合物具有不同的体积为50μm进行3,百米3,和200米3作为爆炸源。结果表明,在给定的气体浓度下,气体-空气混合物的体积越大,爆炸力越强,火焰传播越远。爆炸源附近的压力不一定在整个气体爆炸过程中都达到最大值。随着传播距离的增加,爆炸压力不会线性衰减,而是沿隧道波动。在整个爆炸过程中,火焰传播速度会增加然后降低,分为三个阶段:爆炸开始时的缓慢传播阶段,加速传播阶段和熄灭之前的减速传播阶段。瓦斯爆炸产生的冲击波相互作用并影响爆炸火焰,并且存在一种积极的反馈机制来促进它们之间的相互作用。

更新日期:2020-11-27
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