摘要
研究FDS对室内通风控制型火灾及其外立面火焰特性的预测情况。数值模拟得到了不同开口尺寸下的通风控制型火灾,室内温度值沿竖直方向基本均匀一致,且室内平均气体温度值与理论吻合较好。室内最大热释放速率值小于理论值,相对差距小于20%。当无量纲特征长度值大于10时,其室内质量守恒误差率在5%以内。室外溢流火焰高度与室外热释放速率之间存在2/3的次方相关关系。模拟得到外立面辐射热通量沿高度的分布情况,显示出与实验数据一致的三个不同区域,但其数值高于实验数据。
The accuracy of FI）S in predicting the under-ventilated fire and its facade flame was studied. Under-ventilated condi- tions were obtained in the simulations, and the temperature in- side the enclosure was uniformly distributed, and the average value well followed the temperature of Lawns curve. The HRR inside the enclosure was under predicted in the simulation, and the relative difference is within the region of 20%. The error was under 5 % when the non-dimension al characteristics length value over 10. For the facade flame height, the simulation only obtained one power dependence value on the flame height, that is 2/3. Three regimes were observed in the simulation results of the heat flux to the facade wall, this is the same as that of ex- periments, but the simulation value were lower than the experi- ment.
出处
《消防科学与技术》
CAS
北大核心
2015年第3期287-290,共4页
Fire Science and Technology
基金
江苏省自然科学基金项目(BK20131117)
