采空区最小流动单元压力损失计算与试验*

doi:10.16265/j.cnki.issn 1003-3033.2021.12.011

中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (12): 78-84.doi: 10.16265/j.cnki.issn 1003-3033.2021.12.011

采空区最小流动单元压力损失计算与试验^*

张连会¹, 陈世强^**1,2 副教授, 赵利群³ 高级工程师, 王君³ 工程师, 鲁义² 教授

1 湖南科技大学土木工程学院,湖南湘潭 411201;
2 湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室,湖南湘潭 411201;
3 国家能源集团神东煤炭集团柳塔煤矿, 内蒙古鄂尔多斯 017209

收稿日期:2021-09-07 修回日期:2021-11-14 出版日期:2021-12-28
作者简介:张连会 (1995—),男,山西大同人,硕士研究生,研究方向为地下通风与空气调节。E-mail:zhanglianhui@mail.hnust.edu.cn。
基金资助:
国家自然科学基金资助(51774134, 51974119);湖南省自然科学基金资助(2019JJ60044);湖南省教育厅资助项目(19A173)。

Experiment and calculation of pressure loss of minimum flow unit in goaf

ZHANG Lianhui¹, CHEN Shiqiang^1,2, ZHAO Liqun³, WANG Jun³, LU Yi²

1 School of Civil Engineering, Hunan University of Science and Technology, Xiangtan Hunan 411201, China;
2 Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Goal Mines, Hunan University of Science and Technology, Xiangtan Hunan 411201, China;
3 National Energy Group Shendong Coal Group, Liuta Coal Mine, Erdos Inner Mongolia 017209, China

Received:2021-09-07 Revised:2021-11-14 Published:2021-12-28

摘要/Abstract

摘要： 为使得采空区气体流动压力损失的计算简捷合理,提出一个新的多孔介质物理模型;根据孔隙率相等和单周期流动原则,切割该多孔介质物理模型,构建出最小流动单元;针对最小流动单元,利用流体动力学微分方程组,量化单位长度压力损失与球体直径、气体密度和初速度之间关系,得到简化的一维最小流动单元压力损失计算式;在采空区流场试验平台上验证该计算公式,针对4个入口断面,分别完成26个初速度值与压力损失的实测,且随着断面风速的增加,实测压力损失也增加,且实测压力损失与计算压力损失的比值先减小后趋于稳定,该比值定义为修正系数,进而得到修正系数平均值。结果表明:基于最小流动单元推导出简化的一维压力损失计算式;进一步用修正系数修正一维最小流动单元压力损失计算式,得到拟三维的压力损失计算式,从而实现采空区气体流动压力损失的简捷计算。

关键词: 采空区, 最小流动单元, 压力损失计算, 孔隙率, 断面风速

Abstract: In order to make the calculation of flow pressure loss in goaf simple and reasonable, a new physical model of porous media was proposed. Then, it was cut to construct a minimum flow unit according to principles of equal porosity and single-cycle flow. For the unit, hydrodynamic differential equations were used to quantify relationship between pressure loss per unit length and sphere diameter, gas density and initial velocity, and a simplified one-dimensional minimum flow unit's pressure loss calculation formula was obtained. Finally, the formula was verified on flow field test platform in a goaf, and 26 actual measurements of initial velocity and pressure loss were completed for 4 entrance sections respectively. As section wind speed increased, measured pressure loss also increased, while the ratio of measured loss to the calculated one decreased first and then stabilized. This ratio was defined as correction coefficient, and its average value was obtained. The results show that the simplified formula is derived based on the minimum flow unit, and by further correcting the formula with correction coefficient, a pseudo three-dimensional calculation formula can be obtained, thereby realizing simple calculation of gas flow pressure loss in goaf.

Key words: goaf, minimum flow unit, pressure loss calculation, porosity, sectional wind velocity

中图分类号:

X936

张连会, 陈世强, 赵利群, 王君, 鲁义. 采空区最小流动单元压力损失计算与试验^*[J]. 中国安全科学学报, 2021, 31(12): 78-84.

ZHANG Lianhui, CHEN Shiqiang, ZHAO Liqun, WANG Jun, LU Yi. Experiment and calculation of pressure loss of minimum flow unit in goaf[J]. China Safety Science Journal, 2021, 31(12): 78-84.

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采空区最小流动单元压力损失计算与试验^*

Experiment and calculation of pressure loss of minimum flow unit in goaf

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