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中文摘要：
基于lattice Boltzmann方法建立一个新的模拟裂隙煤体内瓦斯渗流的动力学模型,并利用该模型模拟二维裂隙煤体内瓦斯流动。模拟结果表明,采动压力差对瓦斯流动速度、孔隙瓦斯压力及瓦斯压力梯度都有很大的影响。在采动压力条件下,瓦斯在裂隙煤体中的流动压力具有波动性,波动幅度的大小与流场两端的压力差有关。在瓦斯压力达到峰值前的瞬时,孔隙瓦斯压力梯度很大。随着采动压力差的增大,瓦斯流动由层流过渡到紊流,同时孔隙压力出现发散,压力变化出现明显的非线性特征。基于lattice Boltzmann方法的模拟结果与用其他方法得到的瓦斯渗流规律比较吻合,表明lattice Boltzmann方法可有效模拟瓦斯在裂隙煤体中的运移规律,这为进一步探讨煤与瓦斯两相耦合机制、煤与瓦斯突出机制及瓦斯抽放方案的设计提供新的思路。
英文摘要：
A new dynamic model for simulation of gas flow in fissured coal is established based on lattice Boltzmann method（LBM）,and is used to simulate two-dimensional gas flow in fissured coal.The simulation results demonstrate that the mining differential pressure has a great impact on the flow velocity,the porosity pressure and the pressure gradient of gas in fissured coal.Under the condition of mining pressure,the flow pressure of gas in fissured coal fluctuates at the beginning of seepage,and the amplitude depends on the differential pressure between the two ends of flow field.Then the gas pressure becomes stable,and the system energy reaches its equilibrium state.At the moment just before gas pressure gets its peak value,the gradient of gas porosity pressure becomes very high,and it is the primary reason for coal outburst.Along with the increment of mining differential pressure,the gas flow in fissured coal turns from laminar flow to turbulent flow gradually.As mining differential pressure is very hight,he gas pressure appears divergence,and the dependence between mining differential pressure and gas pressure evidently becomes nonlinear.The velocity of gas flow becomes faster along with the increment of mining differential pressure,and the velocity in the middle of the flow field is faster than that on the sides.The results based on LBM coincide with the related conclusions of gas seepage by other methods very well,which indicates that LBM is an effective method to simulate gas flow in fissured coal.LBM provides a new method in further studying of coupling theory between coal and gas,and outburst mechanism of gas in fissured coal.
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