TAN Ying-xin (谭迎新)， YU Cun-juan（尉存娟）
(School of Chemical Engineering and Environment， North university of China， Taiyuan 030051， China)
Abstract：To test flame propagation velocity of gas explosion in a horizontal tube, a set of flame velocity testing system is designed. The system is composed of two parts： a horizontal tube used for methane burning and a flame detection system. The effect of obstacles on flame propagation velocity of methane explosion is tested. Methane volume density is 10% in the tube. The obstacle is the circular ring, 2 mm thick. Its blockage ratios are 40%,50% and 60%, respectively. The number of obstacles put in the tube is 1,3,5 and 7. Experimental results show that the obstacle has obviously accelerating effect on flame wave of gas explosion. As the number and blockage ratios of the obstacles increase, flame accelerating became more obviously. When there are seven obstacles，the maximum average flame velocity reaches over 351.2 m/s. When the blockage ratio of three obstacles is 60%，the maximum average flame velocity is 238.9 m/s.
Key words：gas explosion; obstacle; flame velocity; horizontal tube; methane
CLD number： O643.2 Document code： A
Article ID： 1674-8042(2012)04-0320-03 doi： 10.3969/j.issn.1674-8042.2012.04.004
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