风机风压对瓦斯风压引起风流逆转的影响

Impact of Different Fan Pressures on Airflow Reversal Induced by Gas Pressure

为研究瓦斯风压引起的旁侧支路风流逆转受风机风压的影响,建立了并联巷道的网络模型,并以一维不可压缩非稳定流常微分方程为基础列出风流速度的控制方程组,利用该方程组计算的结果与现有软件数值模拟的结果接近。方程组利用二次曲线拟合风机曲线,在不同风机曲线拟合系数的情况下,对方程组计算数值解。计算结果表明:加大风机风压可以减弱瓦斯风压对风流的影响,风机风压较大时可以防止风流逆转;风机风压的加大可以提高巷道的初始风速,减少风流恢复正常所用的时间,但是风机风压的加大并不能明显改变风流速度的变化率。

In order to study the impact of fan pressure on the airflow reversion in a side branch induced by gas flow pressure,a parallel roadway network model was built. A control equation set for air velocities based on the one-dimensional incompressible unsteady differential equation was listed according to this model. The results calculated by using the equation set were agreed well with that simulated by software. A quadratic curve was used to fit the fan pressure curve in the equation set,and numerical solutions of the equation set were calculated under the condition of different fitting factor of fan pressure curves.The results showed that increasing the fan pressure could reduce the impact of gas flow pressure on airflow,and larger fan pressure could prevent airflow reversion; the increase of fan pressure could increase the original air velocity in the roadway and reduce the time required for normal airflow,however,the increase of the fan pressure could not significantly improve the change rate of air velocity.