巷道几何特性及总爆炸能对受限空间内瓦斯爆炸的影响

摘要

为了系统性地研究瓦斯聚集巷道的几何特性和尺度对瓦斯爆炸的强度及爆炸特性的影响,本文以计算流体力学(CFD)为主要研究工具,对充满化学计量浓度的瓦斯/空气混合气体的多条虚拟巷道中产生的爆炸进行数值模拟实验.通过引入两个巷道几何特征变量HDSF和FLSF,对总共40种不同特性的巷道中发生的瓦斯爆炸特性进行了分析,阐明了巷道几何特征对瓦斯爆燃超压的影响.研究结果表明,爆炸巷道内空间的长径比越大,瓦斯产生爆轰的可能性越高.此外,巷道的截面积的增大是影响瓦斯爆燃超压的主要因素之一.%In this research,CFD tools were employed to investigate the impact more systematically.Two geomet-ric factors,HDSF(hydraulic diameter scaling factor) and FLSF(gas-fill length scaling factor),were used to ad-just the scale and geometrical features of the prescribed airways.The simulation results were demonstrated and discussed.The conclusions indicate that detonations are more likely to occur when an airway has a larger length to diameter ratio.In addition,the increase in sectional area of an airway is also a factor causing increase of deflagra-tion overpressure.