水平巷道火灾中烟流逆流层长度的实验研究  

Experimental Study on Length of Smoke Back-Flow Layer of Fire in Horizontal Tunnel

作　　者：周延[1] 王德明[1] 周福宝[1] 

机构地区：[1]中国矿业大学能源科学与工程学院,江苏徐州221008

出　　处：《中国矿业大学学报》2001年第5期446-448,共3页Journal of China University of Mining & Technology

基　　金：国家自然科学基金资助项目 ( 5 9876 0 45 );中国矿业大学科技基金

摘　　要：为考察水平巷道火灾中烟流逆流层长度随巷道风速及火源放热速率的变化规律 ,在一条长 9m,横断面 30 cm× 30 cm的模拟巷道中进行了燃烧模拟实验 .实验采用一直径为 1 0 cm,以煤油为燃料且燃烧强度可调的油盘为火源 ,测量了巷道走向垂直中心面上的二维温度分布、风流及烟流速压、烟流组分以及其逆流长度等参数 ,并根据测量结果推算出了巷道风速及火源放热速率 .实验数据的拟合结果表明 ,无量纲逆流长度 L*随火源放热率 Q与巷道风速 u的比值增大近似按指数规律增大 ,即 L* =0 .0 4 0 4 exp( 0 .0 4 1 4Q/u)The experiments were carried out in a horizontal modeling tunnel with a length of 9m and an inner cross sectional area of 30cm×30cm to investigate the effect of flow velocity and heat releasing rate of fire on the length of smoke back flow layer. In the experiments, a basin with a diameter of 10cm, always full of kerosene, was used as a burner, and the combustion rate of kerosene in the burner could be adjusted. The 2 D temperature distribution on the longitudinal vertical centric section of the experimental tunnel, the dynamic pressures of air and smoke flows, the component of smoke, the length of smoke back flow layer and some other parameters were measured. From these measured results, the flow velocity in the experimental tunnel and the heat releasing rate of the burner were calculated. Finally, a fitted exponential curve was made to the experimental data of the dimensionless length L * of smoke back flow layer, the heat releasing rate Q of fire and the airflow velocity u in a tunnel, and a formula L *=0.0404 exp (0.0414Q/u) was obtained.

关 键 词：水平巷道 火灾 烟流逆流层长度 实验 

分 类 号：TD752[矿业工程—矿井通风与安全]