下行风流火灾管道试验与烟流动力特征研究  

Downstream airflow fire dust test and smoke flow dynamic characteristics study

作　　者：李宗翔[1,2] 王海文 李腾 许昊宇 张明乾 LI Zong-xiang;WANG Hai-wen;LI Teng;XU Hao-yu;ZHANG Ming-qian(College of Safety Science and Engineering,Liaoning Technical University,Huludao 125100,Liaoning,China;Institute of Safety Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Suzhou Gold Circuit Co.,Ltd.,Suzhou 215000,Jiangsu,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛125100 [2]辽宁工程技术大学安全科学与工程研究院,辽宁阜新123000 [3]苏州金像电子有限公司,江苏苏州215000

出　　处：《安全与环境学报》2023年第2期391-396,共6页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51774170);辽宁省教育厅项目(LJ2020QNL015)。

摘　　要：为了明确矿井巷道通风量及角度变化对火灾的影响规律,运用矿井火灾管道试验平台及各种传感器数据采集系统,开展下行通风火灾的管道相似模拟试验,得到在不同通风机动力和巷道倾角下巷道风量、各测点温度随时间的变化规律,对下行风流火灾时的风流紊乱状态有了进一步认识。结果表明,火灾时燃烧温度迅速到达顶峰后温度衰减速度随风量增大而加快,巷道火灾高温区域随着巷道风速增大而向火源下风侧移动。增大巷道倾斜角度,火风压作用增强,通风系统稳定性降低,更容易发生烟流逆退现象。在下行通风试验中,存在一个使火风压与通风机动力大小相等方向相反的临界风速。矿井火灾烟流是否产生逆退现象与通风能力有关,通风能力越强,巷道风流克服火区阻力、保持原状态的能力越强。To clarify the influence laws of mine roadway ventilation air volume and changes of mine roadway angle on descensional airflow fire, the pipeline similarity simulation test of descensional airflow fire was carried out by using mine fire pipeline test platform and a variety of sensor data acquisition systems, and the variation laws of roadway air volume and temperature at each measurement point with time under different ventilation power and roadway inclination were obtained. A better understanding of the airflow disorder during the descensional fire was received at present. The following results show that: in the horizontal roadway fire test, the thermal resistance caused by fire reduces the wind speed in the roadway. The combustion temperature rapidly reaches the peak during the period of fire, then the attenuation speed of the temperature increases with the increase of air volume, and the area with the high-temperature of roadway fire moves to the downwind side of the fire source with the increase of the wind speed of the roadway. As the inclined angle of the roadway increases, the effect of fire pressure is enhanced, which makes the stability of the ventilation system reduce and the reversal of smoke flow more likely to occur. In the descensional ventilation test, there was a critical value wind speed of the fire pressure which had the same value and the opposite direction of ventilation power, the wind speed in the roadway is higher than the value, therefore the smoke flow doesn’t occur to reverse. Whether the smoke flow of mine fire had a reversal phenomenon was related to the capacity of the ventilation. The ability of roadway airflow to overcome the resistance in the fire area and to maintain the original state increases with increasing the ventilation capacity. The tests confirmed the relevant theories obtained by previous scholars.

关 键 词：安全工程 灾变通风 风流紊乱 下行通风 烟流扩散 临界风速 

分 类 号：X936[环境科学与工程—安全科学]