http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
An analysis of carbone monoxide distribution in large tunnel fires
Atta Sojoudi,Hossein Afshin,Bijan Farhanieh 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
Fire events and the related toxicants such as CO are responsible for many fatalities in the current century. These hazardous events aremuch more dangerous when they occur in enclosed spaces. In the present study, a theoretical relation is developed for horizontal distributionof CO in a large tunnel fire. Then, the developed criterion is used to study the effect of some rudimentary parameters such as the heatrelease rate (HRR) of fire and tunnel's aspect ratio (AR) on CO and temperature stratification. Theoretical results of various heat releaserates and aspect ratios for horizontal distribution of CO are compared with numerical results using fire dynamics simulator (FDS5.5). It isfound that big fires have higher rates of CO concentration decay in comparison to the smaller ones due to higher air entrainment into thetravelling plume. It is indicated that the smoke travelling at higher values of tunnel AR, dilutes faster. Moreover, using FDS5.5, the relevantvariations in temperature and CO concentration are discussed for tunnel angles ranging from -20˚ to 20˚.