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《Explosion and Shock Waves》 2018-05
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Experimental study and three-dimensional simulation of premixed combustible gas explosion venting in a rectangular cavity

GUO Qiang;WANG Mingyang;GAO Kanghua;ZHAO Tianhui;SUN Song;State Key Laboratory for Disaster Prevention and Mitigation of Explosion and Impact,Army University of Engineering;Navy Donghai Engineering Design Institute;  
In order to investigate the overpressure and flame propagation of premixed combustible gas explosion venting in a large space,experiments of different concentrations of ethylene gas and two different vent sizes have been carried out in a rectangular cavity of 1.21 m~3. Meanwhile,three-dimensional numerical simulations have been performed to simulate the ethylene air explosion venting process with a 0.18 m~2 vent area and a 7%concentration of ethylene gas. The results show that the overpressure has a different response with different vent size. When the small vent is used,the overpressure drops first and then rises,in which the second peak value is larger than the first one. The turbulence caused by the venting process increases significantly the flame front deformation and the flame propagation speed,resulting in the larger second peak. In contrast,for the large vent size,the second peak is lower. The simulated results are in good agreement with the experimental ones.
【Fund】: 国家重点研发计划项目(2017YFC0804702)
【CateGory Index】: O643.2
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