立体结构障碍物的不同放置方式对甲烷预混火焰传播的影响

摘要

Flame propagation speed and overpressure in tube affected by different deposited manner were investigated with three kind of solid structure obstacles.Cubiods,triangular prisms and cylinder were choosn in the experiments.Results demonstrate that deposited manner has different effect on three kind of obstacles.Flame speed makes little change for different deposited manner of cubiods,while flame speed are effected much larger for different deposited manner of triangular prism and cylinder.The difference of peak overpressure in tube affected by deposited manner is in the range of 33% for three kinds of obstacles.Different deposited manner effect on flame speed is much larger than overpressure.When the same solid structure obstacle is placed differently in tube with the same blockage retios,the more surface area of obstacle is surrounded by flame,the more flame speed and overpressure is formed.The flame propagation is greatly affected when obstacles are lied to bifurate the gas flow channel.The faster flame speed leads to the bigger overpressure in tube with different deposited of the same obstacle,while there has no definite relationship between flame speed and overpressure among different solid strcuture obstacles.%分别就长方体、三棱柱和圆柱3种立体结构障碍物的不同放置方式,对甲烷预混火焰在管道内传播的速度和超压的影响进行了研究。研究结果表明：不同立体结构障碍物的放置方式对火焰传播速度和超压的影响程度不同。对于火焰传播速度,长方体影响较小,三棱柱和圆柱影响较大。对于管道中峰值超压,不同放置方式之间导致的差异不大,在33%范围内。对于同一阻塞比立体结构障碍物,当放置于管道中,火焰经过的障碍物表面面积越大,对火焰传播速度和管道超压影响也越大。当障碍物使流通管道分叉时,对火焰传播影响将更大。对于同一立体结构障碍物,火焰传播速度越快,其导致的管道超压也越大,而不同立体结构障碍物火焰传播速度和超压之间没有必然联系。