自由阳台型喷射羽流产烟量研究综述

Review on the smoke production rate of the free balcony spill plumes

对现有典型自由喷射型羽流产烟量模型进行总结,并结合具体工程案例的FDS模拟对各模型产烟量计算值进行对比。结果表明:各二维羽流产烟量模型计算结果相差不大,当起火房间的开口宽度足够大时,用二维羽流产烟量模型可较准确地计算出产烟量;但对于三维流动,各产烟量模型仍存在一定的差异,但基于近期研究成果的NFPA 92产烟量模型和Harrison及Thomas-1998的3D模型结果相差不大。建议在中庭建筑及大空间类建筑进行排烟设计时,喷射羽流的产烟量根据喷射羽流的流动特性来选择计算模型,对于三维流动,当各模型计算结果相差较大时,可采用CFD辅助分析。

Typical spill plume models were reviewed,and comparisons of the smoke production rates predicted by different spill plume models were made combining with the FDS simulation of engineering case.The results showed that there are almost no differences between the results by all 2D models.For the 3Dspill plume model,differences still exist.The smoke flow rates calculated by NFPA 92 equation were found to be close to those predicted by Harrison and Thomas-1998 model.It would be better to choose the spill plume model following the thermal dynamics of the plume in a given building for the smoke management design,and for the 3Dspill plumes,sometimes CFD can be used to do some analysis.