不同自然风速下人工通风对深凹露天矿风流场的影响
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摘要
为研究不同自然风速下人工通风对深凹露天矿风流场的影响,利用FLUENT对某深凹露天矿内的风流场进行了模拟研究。研究结果表明:当自然风速为2 m/s时人工通风前后坑内复环流体积减少不太明显;当自然风速为5 m/s时封闭圈以下复环流影响范围小,因此复环流体积减少也不明显;而当自然风速为3 m/s和4 m/s时,靠近背风坡的低压区和低速区显著变化,复环流体积减少明显。在自然风速较低或无风时空气交换率缓慢增加;当自然风速≥2 m/s时空气交换率均显著增加。与复环流的体积变化趋势基本一致,验证了人工通风方案的可行性,采取人工通风措施后深凹露天矿内的风流场均得到显著改善。
In order to investigate the influence of artificial ventilation on the wind flow field in deep open pit mine under different natural wind speeds,FLUENT was used to simulate the wind field in deep sunken open-pit mine. The results show that the volume of recirculation flow before and after artificial ventilation is not obvious when natural wind speed is 2 m/s. The range of recirculation flow below the closed loop is small when natural wind speed is 5 m/s,so the reduction of recirculation flow is not obvious. The low-pressure zone and the low-speed zone near the leeward slope change significantly when natural wind speed is 3 m/s and 4 m/s,and recirculation flow decreases obviously. The air exchange rate increases slowly when natural wind speed is low or no wind. The air exchange rate is significantly increased when natural wind speed is not less than 2 m/s. This is basically consistent with the volume change trend of recirculation flow,which verifies the feasibility of artificial ventilation scheme. The wind flow field in the deep sunken open-pit mine was significantly improved after artificial ventilation measures were adopted.
In order to investigate the influence of artificial ventilation on the wind flow field in deep open pit mine under different natural wind speeds,FLUENT was used to simulate the wind field in deep sunken open-pit mine. The results show that the volume of recirculation flow before and after artificial ventilation is not obvious when natural wind speed is 2 m/s. The range of recirculation flow below the closed loop is small when natural wind speed is 5 m/s,so the reduction of recirculation flow is not obvious. The low-pressure zone and the low-speed zone near the leeward slope change significantly when natural wind speed is 3 m/s and 4 m/s,and recirculation flow decreases obviously. The air exchange rate increases slowly when natural wind speed is low or no wind. The air exchange rate is significantly increased when natural wind speed is not less than 2 m/s. This is basically consistent with the volume change trend of recirculation flow,which verifies the feasibility of artificial ventilation scheme. The wind flow field in the deep sunken open-pit mine was significantly improved after artificial ventilation measures were adopted.
引文
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[3]Wang Yuan,Du Cuifeng,Jin Wenbo,et al.Key factor analysis and model establishment of variation of rock face temperature in a deep open-pit mine[J].Journal of Central South University,2018,25(7):1786-1798.
[4]Du Cuifeng,Jin Wenbo,Wang Yuan.Experimental study on influential factors of spatial morphology of compound circulation in deepopen surface mines[J].Revista de la Facultad de Ingeniería,2017,32(16):999-1008.
[5]Du Cuifeng,Jin Wenbo,Wang Puyu.Experimental study on evaluation indexes of central point and region of complex circulation[J].Boletín Técnico,2017,55(20):257-266.
[6]Du Cuifeng,Jin Wenbo,Zuo Ying.Numerical simulation and experimental study on distribution and evolution law of inversion layer in deeply sunken open pit mines[J].Gummi Fasern Kunststoffe,2016,69:606-611
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