| 煤层瓦斯流动数值解算时空步长的选取 |
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| 引用本文： | 高建良,吴金刚.煤层瓦斯流动数值解算时空步长的选取[J].中国安全科学学报,2006,16(7):9-12. |
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| 作者姓名： | 高建良 吴金刚 |
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| 作者单位： | 河南理工大学安全科学与工程学院,焦作,454003 |
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| 基金项目： | 河南省高校创新人才培养项目;教育部留学回国人员科研启动基金;河南理工大学校科研和教改项目 |
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| 摘 要： | 对应用有限差分法解算煤层瓦斯流动时,如何选取合适的时间步长和空间步长、如何根据煤层瓦斯压力分布计算煤壁瓦斯涌出量等问题进行了分析和探讨。用煤壁处节点与煤层内相邻节点间的瓦斯压力梯度来求煤壁瓦斯涌出量的方法误差较大。根据煤层内各节点的瓦斯压力值对瓦斯压力进行拟合,用拟合曲线在煤壁处的斜率作为煤壁瓦斯压力梯度计算瓦斯涌出量,能得到可靠精确的结果。通过考察选取不同时间步长和空间步长时煤壁瓦斯压力梯度的变化,提出了选取合适的时间步长和空间步长的方法。
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| 关 键 词： | 瓦斯压力 煤壁 压力梯度 时间步长 空间步长 |
| 文章编号： | 1003-3033（2006）07-0009-04 |
| 收稿时间： | 2006-02-17 |
| 修稿时间： | 2006-02-172006-05-23 |
Determination of Time Step and Space Interval in Numerical Simulation of Gas Flow in Coal seams |
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| GAO Jian-liang,WU Jin-gang.Determination of Time Step and Space Interval in Numerical Simulation of Gas Flow in Coal seams[J].China Safety Science Journal,2006,16(7):9-12. |
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| Authors: | GAO Jian-liang WU Jin-gang |
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| Abstract: | The method for proper determinafion of the time step and space interval is studied. Calculation of the gas emission rate according to gas pressure distribution is analyzed when finite difference method is applied to simulate the gas flow in coal seams. When the gas pressure gradient between airway surface and the first node away from the wall surface in coal seam is used to calculate the gas emission rate, significant error may occur. It is suggested that gas pressure gradient on airway surface sthould be determined from the fitted gas pressure distribution curve in coal seam. It is more reliable and accurate to calculate the gas emission rate according to gas pressure gradient obtained from the fitted gas pressure distribution curve. The way to determine the suitable time and space interval is put forward by investigating the variation of gas pressure gradient on wall with several and space intervals. |
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| Keywords: | gas pressure wall preasure gradient time interval space interval |
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