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针对矿井火灾时期矿井通风系统总风阻飘移(改变)的问题,建立矿井通风网络计算机仿真数值模型,编制计算机程序。火灾发生时,在火风压的动力作用下,矿井总风阻发生飘移,即上行风流火灾导致矿井通风机通风系统总风阻增大。当火灾高温烟流处在并联风路的一个分支时,风阻飘移量显著增大,当处在矿井通风主干风路时,风阻飘移量比较小。火灾时期矿井风阻发生飘移的原因是火灾动力对通风系统的干扰,并且是由于通风机处在与外部漏风分支相并联的位置上、火灾点处在某一支风路上而产生的。模拟试验结果表明:风阻飘移量随着火灾火势的增大而增大,通风机能力越大,风阻飘移量越小;提高通风机能力,有利于克服通风机通风系统总风阻飘移的问题;同时,处在并联支路上的上行风流火灾,风阻飘移量也与矿井本身总风阻大小有关,原始风阻越大,风阻飘移量越小。火灾火势与风阻飘移量变化的函数关系在文中给出。
Aiming at the problem of total wind resistance drift (change) in mine ventilation system during mine fire, a numerical simulation model of mine ventilation network was set up and a computer program was compiled. When a fire broke out, the total wind resistance of the mine drifted under the action of the fire pressure, that is, the upward wind flow fire caused the total wind resistance of the mine ventilator ventilation system to increase. When the fire at high temperature smoke stream in a branch of the parallel air duct, the wind resistance drift significantly increased, when the mine ventilation main air duct, the wind resistance drift is relatively small. The reason why the wind resistance of the mine drifts during the fire is due to the disturbance of the fire power to the ventilation system and is caused by the ventilator being in parallel with the external air leakage branch and the fire point being located on a certain air duct. The simulation results show that the drift of wind resistance increases with the increase of fire and fire, and the greater the capacity of ventilator, the smaller the drift of wind resistance. The improvement of the capacity of ventilator helps to overcome the problem of drift of total air resistance of ventilator ventilation system. , In the parallel branch of the upwind fire, the amount of wind resistance drift with the mine itself is also related to the total size of the wind resistance, the greater the original wind resistance, wind resistance drift smaller. Fire fire and wind resistance drift changes in the functional relationship is given in the article.