基于高速摄像的半开口管道内瓦斯预混火焰传播特征的分析  

Analysis on Propagation Characteristics of Premixed Methane-air Flame in an Half-Open Tube Based on High-Speed Video Camera

作　　者：汪泉[1,2,3] 沈兆武[1] 郭子如[2] 马宏昊[1,3] 吴红波[2] 

机构地区：[1]中国科学技术大学工程科学学院,安徽合肥230027 [2]安徽理工大学化学工程学院,安徽淮南232001 [3]中国科学技术大学火灾科学国家重点实验室,安徽合肥230027

出　　处：《爆破器材》2013年第5期18-22,共5页Explosive Materials

基　　金：国家自然科学基金重点项目(51134012);火灾科学国家重点实验室开放课题(HZ2011-KF09);安徽省教育厅优秀青年人才基金项目(2010SQRL057ZD)

摘　　要：采用高速摄像研究了长1.5m、截面0.1m×0.1m半开口有机玻璃方管内3种典型浓度下瓦斯预混火焰传播特征。结果表明:典型的瓦斯火焰运动过程分为火焰成长期、火焰加速期和火焰消失期3个阶段;甲烷体积分数略高于最佳值时,管内瓦斯火焰传播速度较大;3种典型浓度下光滑管道内瓦斯火焰传播阵面—点火时间满足GaussAmp曲线,其拟合度较高、相关性好;由火焰阵面—时间拟合曲线微分得出的火焰传播速度—时间曲线,更能反映实际瞬时火焰传播速度情况。火焰运动图像分析及瞬时火焰传播速度计算方法,对管内气体火焰或矿井瓦斯火焰特征研究具有一定的借鉴作用。A high-speed color video camera was adopted to study the premixed methane-air flame propagation charac- teristics under 3 typical concentrations in a square plexiglass tube of 1.5 meters long and a cross section of 0.1 m × 0.1 m. As the results, the flame movement can be divided into 3 stages involving flame growing stage, flame accelerating stage and flame vanishing stage. When the volume fraction of methane is shghtly higher than the optimum value, the flame propaga- tion velocity can reach to the maximum value. The relationships between the flame front location and the time after ignition meet the curve of GaussAmp, and the fitting degree and its correlation coefficient are high. The flame propagation velocity- time curve via the differential of the flame front location-time curve revealed the actual instantaneous values of the flame propagation velocity. The flame movement images analysis and the calculation method of instantaneous flame propagation velocity could be references for studying the gas flame characteristics in experimental tubes or in mine roadways.

关 键 词：瓦斯 预混火焰 管道 高速摄像 火焰传播速度 非线性拟合 

分 类 号：TD712[矿业工程—矿井通风与安全]