瓦斯风压导致旁侧支路风流逆转的数值分析  

Numerical Analysis of Lateral Branch Airflow Reversal Caused by Gas

作　　者：赵琦[1] 

机构地区：[1]中铁十九局集团矿业投资有限公司,北京100161

出　　处：《煤炭技术》2018年第2期165-167,共3页Coal Technology

摘　　要：瓦斯在有高差的巷道中积聚会形成瓦斯风压,向上通风倾斜巷道中的瓦斯风压有可能使旁侧支路风流逆转。为了研究这种现象,建立并联向上通风巷道的网络模型,并以一维不可压缩非稳定流常微分方程为基础列出控制方程,模型忽略了巷道中的瓦斯的分子扩散、紊流扩散及纵向弥散效应。利用该模型通过Runge-Kutta法计算所得的结果和前人考虑瓦斯扩散、弥散作用的计算结果很接近。利用该模型对不同风机风压、不同倾角以及不同阻力系数的情况进行了多组数值实验。实验结果表明:巷道倾角的增大会减小风流逆转后最低风速受倾角变化影响的敏感程度;旁侧支路风阻的增加可以使旁侧支路风流变化范围减小。Gas accumulation in a declining roadway would form gas flow pressure which in upwardventilated roadway has the potential to slip sideways airflow reversal. A parallel roadway network modelis established and equations are listed based on one-dimensional incompressible unsteady flow ODE.The model ignores gas molecular diffusion, turbulent diffusion and longitudinal dispersion, andconsiders the change caused by the density in airflow resistance coefficient. The calculation results ofthis model by Runge-Kutta method are closed to the previous considering gas diffusion and dispersioneffect. Using this model, multiple sets of numerical experiments were done with different fan pressure,different inclinations and different drag coefficient. The results show that： the increase will reduceinfluence of the roadway inclination angle changes on airflow reversal; changing the fan pressure canchange reversal state of the lateral branch, but does not change its rate of decline in wind speed;windage of lateral branch increasing can reduce airflow range.

关 键 词：瓦斯风压 风流逆转 数值分析 

分 类 号：TD72[矿业工程—矿井通风与安全]