原木燃烧羽流的试验研究与数值模拟

Experimental research and numerical simulation of the log combustion plume

采用落叶松作为试验原木材料进行室外燃烧试验,水平和竖直方向设置热电偶,研究在0、2 m/s风速条件下原木燃烧时火羽流温度随时间的变化情况。采用FDS模拟原木燃烧火羽流温度,与试验结果进行对比。结果表明,FDS能够模拟原木燃烧火羽流的温度变化规律;火羽流中心线轴向温度随着高度的增加而降低,随着风速的增大降低的程度越大;经典模型可以预测原木燃烧火羽流的中心线轴向温度。

By an outdoor combustion experiment with log, the characteristics of the temperature of fire plume under the cer- tain conditions of 0 m/s and 2 m/s speed of wind were studied. The thermal couples were set horizontally and vertically. The FDS was used to simulate the fire too. By contrastive analysis, it was showed that the temperature of fire plume in the process of log combustion could be simulated by FDS. The temperature of fire plume in centerline axial decreases with the increasing of the {lame height and it decreases more with the increasing of the wind speed. The temperature of fire plume in centerline axial can be predicted by the classical model.