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《China Safety Science Journal》 2011-08
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Experiment on Ignition Energy of LPG and Analysis on Flame Propagation of Explosion

SHAO Hui1 DUAN Guo-ning1 SHAO Feng2 WANG Chun-hua3 HOU Li-juan1(1 Department of Environment and Safety Engineering,Changzhou University,Changzhou Jiangsu213164,China 2 Department of Electron and Information,Anhui Finance & Trade Vocational College,Hefei Anhui230601,China 3 Security Department,Salt Chemical Co.,Ltd.Changzhou,Changzhou Jiangsu213200,China)  
The relation between volume fraction of LPG and ignition energy and analysis on fame propagation of explosion were studied.A series of explosion experiments were conducted based on a special device by adjusting volume fraction of LPG to ignition energy.The high-speed camera was used to record the dynamic process of LPG explosion.The results show that the relation between volume fraction and ignition energy changes slowly when the volume fraction of LPG explosion is amongst 5%-9%,and any slight changes of volume fraction lead to significant changes of ignition energy when the volume fraction is less than 5% or greater than 9%.Image analysis on the explosion shows that flame acceleration in the differential form plays a leading role in the initial explosion.With spreading of flame from ignition position to surrounding,smooth laminar flame becomes turbulent flame.The flame front appears some wrinkles,and it also increases the burning area.At the same time,the spreading speed of flame increases gradually until it reaches the maximum.In the whole process of the spreading of flame,the flame front accelerates in an instable form.
【Fund】: 2009年江苏省科技支撑计划(BE2009624)
【CateGory Index】: X932
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