摘要
为了研究通风动态性对采空区瓦斯分布和氧气分布的影响,运用GAMBIT建立了采空区物理模型,利用FLUENT软件模拟了不同工作面压差下的采空区瓦斯体积分数和氧气体积分数分布,并得到采空区交界面漏风速度分布。结果表明:随着压差增大,漏风量增加,瓦斯和氧气临界体积分数出现位置均向采空区深部移动;增大的压差对临界氧气百分数出现位置的影响程度大于对临界瓦斯体积分数的影响;随着压差增大,进风巷端头来流冲击效应越趋明显。研究结论对防治采空区遗煤自燃和瓦斯积聚及涌出具有参考意义。
The article is mainly concerned about the effects of dynamic pressure difference on gas distribution and oxygen distribution in goaf zone. The physical models of goaf was established by using GAMBIT,and it was simulated the leakage velocity distribution along the interface of this goaf, gas concentration and oxygen concentration distribution in the goaf using FLUENT. The calculations showed that ： as the pressure difference increases, as air-leakage rate adds, additionally, the starting locations of critical percent of gas and oxygen move to the deeper zone of the goaf ; the affect of adding pressure difference on oxygen is more than that on gas ; with the pressure differ-ence adding, the shock of the inlet airflow affects more notably the distribution of gas and oxygen in this goaf. The conclusions have guide significance for the control of spontaneous combustion of coal and gas accumulation in goaf.
出处
《中州煤炭》
2016年第12期1-5,共5页
Zhongzhou Coal
基金
国家自然科学基金项目(U1361118)
湖南省自然科学基金项目(2015JJ2061)
湖南省教育厅资助项目(14C0425)
关键词
动态压差
采空区
瓦斯分布
氧气分布
采煤工作面
dynamic pressure difference
goaf
gas distribution
oxygen distribution
coal mining face
