地下矿通风系统风流稳定性分析新方法

利用通风系统节点风流平衡关系和回路阻力平衡关系，分析了风网中各分支间基于空气动力学特征的制约关系，提出了某分支风阻、阻力发生变化时，其它分支的风量对此变化作出反应的分析模型，并随之提出了抑制分支风量变化的控制模型，给出了度量反应敏感性强弱的方法。研究发现，对于一个确定的通风网络，当分支风阻或阻力改变时，各分支风量变化对其它巷道风阻或阻力变化的敏感指数曲线是确定的曲线；当通过改变一些分支风阻值来抵消另一些分支风量变化时，各分支风阻变化对其它分支风阻变化的敏感指数曲线是确定的直线。预先计算出这些敏感指数曲线，并绘制成曲线图谱，对于监测和预测风流稳定性具有重要价值。

A New Approach to Analyze the Air Flow Stability of Ventilation System in Underground Mines

The air dynamic property based constrained relationship among branches in the air network is analyzed by using the rule of air flow balance in nodes and pressure balance along circuits of the ventilation system.The analysis model which describes air volume varying of other branches is put forward when the air resistance and pressure of a certain branch vary.The control model to restrain the air volume varying of the branch is raised and the methods to calculate the strength of sensitivity are given.It is found that for a given ventilation system,where the air resistance or pressure in the branch changes,the sensitivity index curve of variation of ventilation volume to that of resistance or pressure in the branch is defi- nite;when variation of ventilation volume in some branches are counteracted by changing air resistances in some other bran- ches,the sensitivity index curve variation of resistance in some branches to that in some other branches is a straight line. These sensitivity index curves can be calculated in advance and can be plotted to the curve pattern.They are of important value to monitoring and forecasting the stability of the air flow.