中文摘要：

为了寻求下行风流火灾的有效控制途径，应用突变理论推导了下行通风主干风路风流逆转的突变势函数，揭示出其逆转过程具有突变特征，分析了下行风流逆转具有的突跳、分叉、不可达、滞后、多模态等多种非线性特征，实验验证了下行风流逆转的突变过程。研究结果表明：下行风流逆转在跨越临界点时具有突跳特征，巷道风量维持较高数值时仍具有随时逆转的可能性。研究结论初步突破了对传统的风流逆转过程的认识，有助于寻求下行风流火灾的有效控制途径。

英文摘要：

In order to find more effective control measurements for declensional ventilation mine fire, the catastrophe potential function of airflow reversal in a declensional ventilated mine fire was deduced by using catastrophe theory, which indicates the airflow reversing process has discontinuous characteristics. Base upon that, the non-linear characteristics, such as jumping-off, bifurcation, in-accession, hysteretic, polymorphism, etc, were analyzed. Beyond that, the experimental result was employed to prove that it is a catastrophe process in the downcast airflow reversal. The results obtained show that airflow reversal of declensional ventilation is catastrophic and the reversal may occur even in higher quantity of ventilation airflow. This breaks through the traditional knowledge about airflow reversal and helps to find more effective control measurements for such kind of mine fires.