采空区场流数值模拟程序(G3)实现与应用

基于非均质多孔介质漏风渗流方程、分相气体(瓦斯、氧、CO)渗流-扩散方程和多孔介质渗流综合传热方程,建立了采空区安全(瓦斯、自然发火等)分析数值模型,开发了用迎风格式有限元方法联立求解计算机程序(G3).结合Y形通风形式采空区的求解实例,展示了G3能够适应各种复杂边界条件,并给出工作面开采条件下采空区内各相气体和温度变化的图形分布解G3中采空区按冒落非均质介质处理;考虑了瓦斯涌出对自燃的耦合作用,并能反映工作面推进、通风量等因素影响关系.可操作性好,能对各种情况做任意性模拟试验,便于从理论上描绘采空区漏风流态,动态描绘了瓦斯、氧、CO浓度和温度的分布状态及其变化过程.图7,参16.

Realization and application of numerical simulating program (G3) for field flow of goaf

A numerical model for safety analysis, such as the analysis of gas, spontaneous combustion, in goaf is established based on air leakage flow equation for inhomogeneous porous medium, seepage and diffusion equation for split phase gas,(such as gas, oxygen and carbon monoxide), and seepage integrative heat transfer equation for porous medium, at the same time, a computer program, G3, is developed on the basis of the simultaneousness and solve by using windward finite element method. According to the solving examples of the goaf with Y-type ventilation fashion, program G3 can adapt all kinks of complicated boundary conditions, and the graph distribution solve of the variations of every phase gas and temperature in the goaf while the working face is being mined are also can be given. Goaf is considered as heterogeneous media in G3, and the coupling function between gas effusion and spontaneous combustion is also been taken into account. G3 can show the influence relationship of working face advance and air quantity and so on factors. G3 has many advantages, such as good operability, simulating tests can be done according to all kinds of conditions, describing the flow state of goaf air leakage in theory easily, dynamic describing the distribution state and variation process of the concentration and temperature of gas, oxygen and carbine monoxide. 7figs., 16refs.