Deposited manner of solid structure obstacles influence on flame propagation in premixed-methane tube

Abstract：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.