利用压力相似预测高原低压环境小尺寸池火燃烧速率的变化特性  

Small Scale Pool Fire Burning Rate Under Reduced Atmospheric Pressure Using Pressure Modeling

作　　者：涂然[1] 雷佼[1] 王彦[1] 方俊[1] 王进军[1] 张永明[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230026

出　　处：《燃烧科学与技术》2010年第5期467-471,共5页Journal of Combustion Science and Technology

基　　金：国家"十一五"科技支撑计划资助项目(2006BAK06B07);国家自然科学基金资助项目(50706049)

摘　　要：运用火灾动力学中的压力相似分析理论,推导出高海拔低压环境下的池火燃烧速率与常压环境下的相似关系,并结合前人实验数据,得到非受限燃烧条件下,等效直径在10～50 cm池火燃烧速率随气压降低呈线性变化的规律.通过开展拉萨低压地区及合肥常压地区的池火燃烧对比实验,并结合前人的实验数据对理论关系式进行验证,研究结果表明,压力相似分析虽仅从动力学角度出发,没有包含对燃烧化学机理的探讨,但仍然能够较好地反映出燃烧速率随环境压力的变化规律,对于指导实验研究,预测实验结果具有重要意义.According to pressure modeling analysis and experimental data collected by other researchers,the relationship of pool fire burning rates under different ambient atmospheric pressure was presented.The theoretical analysis showed that for open pool fires with the diameters from 10 cm to 50 cm,the burning rate decreased linearly with the increased altitude.This relationship was proved by two fuel pool fire experiments conducted in Hefei and Lhasa,and by data from other researchers as well.The experimental results show that despite inaccuracy more or less due to ignoring combustion mechanism,the pressure modeling analysis is still a good method for forecasting the relationships or rules of pool fire combustion under different ambient pressures.

关 键 词：相似分析 压力相似 池火燃烧速率 无量纲热释放速率 

分 类 号：X928.7[环境科学与工程—安全科学]