综掘工作面气固两相流耦合的CFD模拟
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摘要
针对目前煤矿井下掘进工作面环境复杂、产尘量大、风流速度和粉尘浓度监测难的问题,基于CFD理论,建立掘进工作面巷道模型、耦合连续相和离散相模型,选择重整化的k-ε模型,模拟风流场和粉尘浓度场的分布规律。结果表明,巷道前10 m的风流流线比较紊乱,在距掘进工作面2 m的回风侧、掘进机附近存在强涡流。由于风流的裹挟卷吸和重力沉降作用,粉尘多聚集在巷道回风侧和掘进机上侧。在掘进机后方巷道区域,粉尘浓度分布规律和风流速度分布呈现出一致性,都是回风一侧大于进风侧,且变化速度趋于平稳。该研究可为后续通风除尘的风量计算及降除尘设施位置安设提供参考。
This paper is a response to the notorious difficulties encountered in coal mine driving face,such as complex environment,a greater amount of dust,and more difficult monitoring of wind velocity and dust concentration. The study building on CFD theory is focused on simulating the law underlying the distribution of the flow velocity and the dust concentration by developing a roadway model and coupled continuous and discrete phase models,and choosing RNG k-ε model. The results show that the airflow line 10 meters in front of the roadway is quite disordered; there exist stronger vortexes on the air return side 2 m away from the tunneling face and near the tunneling machine; wind currents and gravitational subsidence result in most of dust concentrated in the air return side of the roadway and the upper side of the tunneling machine; there is a consistence between the dust concentration distribution law and wind velocity distribution in the roadway area behind the tunneling machine,suggesting that the velocity is greater in the return wind side than in the inlet wind side and tends to show a stable change speed. This study could provide a reference for air volume calculation and installation of dust removal facilities.
This paper is a response to the notorious difficulties encountered in coal mine driving face,such as complex environment,a greater amount of dust,and more difficult monitoring of wind velocity and dust concentration. The study building on CFD theory is focused on simulating the law underlying the distribution of the flow velocity and the dust concentration by developing a roadway model and coupled continuous and discrete phase models,and choosing RNG k-ε model. The results show that the airflow line 10 meters in front of the roadway is quite disordered; there exist stronger vortexes on the air return side 2 m away from the tunneling face and near the tunneling machine; wind currents and gravitational subsidence result in most of dust concentrated in the air return side of the roadway and the upper side of the tunneling machine; there is a consistence between the dust concentration distribution law and wind velocity distribution in the roadway area behind the tunneling machine,suggesting that the velocity is greater in the return wind side than in the inlet wind side and tends to show a stable change speed. This study could provide a reference for air volume calculation and installation of dust removal facilities.
引文
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[2]张义坤,蒋仲安,孙雅茹.附壁风筒对掘进工作面通风除尘的促进作用[J].煤矿安全,2017,48(12):161-163.
[3]孟晗,鲁忠良.综掘工作面长压短抽通风下粉尘分布的数值模拟[J].中国煤炭,2018,44(1):28-131.
[4]胡方坤,陆新晓,王德明,等.基于CFD数值模拟分析综掘工作面粉尘迁移规律研究[J].中国煤炭,2012,38(6):94-98,103.
[5]段中喆.ANSYS FLUENT流体分析与工程实例[M].北京:电子工业出版社,2015.
[6]张继健.综掘工作面粉尘运移与沉积的气固两相流模拟[D].北京:中国矿业大学,2015.