挡板障碍物加速火焰传播及其超压变化的实验研究  

Experimental study of flame acceleration and overpressure induced by baffleobstacle

作　　者：谢波[1] 范宝春[2] 王克全[1] 夏自柱[1] 

机构地区：[1]煤炭科学研究总院重庆分院,重庆400037 [2]南京理工大学动力工程学院,江苏南京210094

出　　处：《煤炭学报》2002年第6期627-631,共5页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(19832030)

摘　　要：障碍物加速火焰传播及其超压变化的实验研究对于气体爆炸真实特性的理解、爆炸场预估和防爆工程设计具有重要的意义.利用CH4/Air混合物(体积百分比为9 3%),在自制的卧式燃烧管中对垂直挡板障碍物加速火焰及其对爆炸超压的影响进行了实验研究,火焰阵面通过单个挡板时的高速摄影表明,在挡板障碍物诱导的流场作用下,火焰阵面发生拉伸或褶皱变形,燃烧增强.当单个挡板布置时,挡板后方一定距离内火焰速度和最大超压值与无挡板情况比较明显增大,且这种趋势随着挡板高度的增加而增加.在多个挡板障碍物布置情况下,火焰在整个传播通道上呈脉动加速的趋势,且明显生成了激波.The experimental study of duct flame acceleration and overpressure rising of gas explosion is practically significant for the explosionfield estimation, the explosionprotection design, and the understanding of real characteristics of gas explosion. In this paper, the flame accelerating induced by vertical baffleobstacle and its effect on explosion overpressure have been experimentally studied in a selfdeveloped horizontal FAT (flame acceleration tube), using 93% methaneair mixture. The highspeed images indicated that the flame sheet was stretched and deformed during it traveling over the single baffle which is mounted on tube floor and vertical to the tube axis, therefore combustion is enhanced by the flow resulted from the baffleobstacle. Compared with the blank experiment result, the flame, induced by a single baffle, propagates more rapidly in the scope of fivebaffleheight behind the obstacle, and the max. overpressure in FAT increased by three times approximately. With the baffleheight increased, the situation becomes more distinct. When multibaffle obstacles installed, the flame accelerates in a fluctuation way along the whole horizontal FAT, and the shock wave is formed.

关 键 词：挡板 障碍物 火焰传播 爆炸超压 激波 

分 类 号：X928.7[环境科学与工程—安全科学]