中文摘要：

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.

英文摘要：

The paper has established a computer-simulation model of the mining ventilation system based on a corresponding computer pro- gram in regard to the problem of the entire resistance drift （change） of the ventilation tendency during a mine fire. In our simulation and analysis model, we have pointed out that, when a fire took place in a mine, its entire resistance to the ventilation is likely to drift or change under the dynamic effect of the fire pressure, that is, the fire ＇ s up- ward pushing is likely to cause the increase of the ventilation resis- tance to the whole ventilation system. In such a situation, the venti- lation resistance tends to increase significantly while the fire-smog is moving at high temperatures in a branch of the parallel wind passage. However, it would get smaller if the fire-smog moves in the main branch of the ventilation system. The true reason of the ventilation re- sistance drift or change is that the interference of the fire impetus with the ventilation system, in addition to the fan movement, which often comes along with the branch of the external ventilation leakage. The results of our simulated experiments indicate that the strength of the wind resistance tends to increase with the fire but decrease with the capability of the fan. That is to say, the improvement of the capgbihty of the fan can help to overcome the problem of the total ventilation resistance drift. Moreover, if the fire＇ s upward pushing is in the parallel branches, the ventilation resistance drift can be found in relationto the mine＇s total ventilation resistance. The greater the original ventilation resistance is, the smaller the ventilation resistance drift would be, given the fire load and the strength of the ventilation resistance.