Deflagration to detonation transition in aluminum dust-air mixture under weak ignition condition |
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Authors: | Qingming Liu Xiaodong Li Chunhua Bai |
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Affiliation: | State Key Lab of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China |
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Abstract: | Deflagration to detonation transition (DDT) in flake aluminum dust-air mixture was studied in a 199 mm inner diameter and 29.6 m long horizontal tube. 40 sets of dust dispersion system were used to disperse flake aluminum into the experimental tube. An electric spark of 40 J was used to ignite the aluminum-air mixture. Self-sustained detonation was observed and the characteristics of deflagration to detonation transition process were studied. Contributed to the transverse wave and cellular structure of detonation wave front in aluminum-air mixture, the propagation velocity of detonation wave ranges from 1480 m/s to 1820 m/s and the maximum overpressure oscillates between 40 and 102 bar. Single head spinning detonation wave in aluminum dust-air mixture was observed and the cell size was evaluated. |
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Keywords: | Deflagration to detonation transition Detonation wave structure Aluminum dust Experimental tube Aluminum dust explosion |
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