火源位置对室内火灾的影响研究

Study on influence of fire location on indoor fire

为研究火源位置对室内火灾传热传质及烟气危害性的影响,利用火灾动力学模拟器构建室内火灾模型,并开展室内火灾模拟试验;设置3种不同火源位置场景,通过小尺寸火灾试验来验证数值模拟程序及参数,确保计算结果的合理性后,进行数值计算;探讨在3种场景下的速度场、温度场及烟气的剂量有效分数(FED)的变化。研究表明:水平方向上,室内火灾通过门对室外最大影响范围为房间水平长度的66. 7%;当火源位置处于房间地面几何中心时,从开始着火到烟气具有致死性所需的时间最长,比最短场景多21. 75%。

In order to study the influence of fire location on heat and mass transfer and smoke hazard in the room when a fire occurs,the indoor fire model was constructed by using fire dynamics simulator,and the indoor fire simulation experiments were carried out.Three cases with different fire source locations were set up.After verifying the rationality of the model,the numerical simulation was carried out.The changes of velocity field,temperature field and FED in three cases were discussed.Results show that in the horizontal direction,the maximum influence of indoor fire passing through the door on the outdoor is 66.7%of the room's horizontal length,and that when the fire source is located in the geometric center of the room's ground,the time required from the start of fire to the lethality of smoke is the longest,which is 21.75%more than the shortest scene.