Effect of burst pressure on vented hydrogen-air explosion in a cylindrical vessel
Effect of burst pressure on vented hydrogen-air explosion in a cylindrical vessel
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爆破压力对圆柱形容器内氢气-空气爆炸的影响
DOI：
10.1016/j.ijhydene.2015.03.059
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发表时间：
2015-05-25
影响因子：
7.2
通讯作者：
Wang, Changjian
中科院分区：
文献类型：
--
作者：
Guo, Jin;Li, Quan;Wang, Changjian
实验研究了当量比为2的富氢-空气混合物在带颈圆柱形容器中爆炸泄放时，泄放压力对内压和火焰演化的影响。实验结果表明，在低泄爆压力下，容器出口处出现4个压力峰值，分别对应于泄爆失效、已燃气泄放、容器内已燃气最大产率和气体吸入4个连续阶段。但在高爆破压力下，第二、三压力峰消失，第一压力峰占主导地位。由于吸力而产生的第四个压力峰值保持在几千帕左右。容器内的压力总是呈现单峰特征，且随着泄爆压力的增大而增大。在低爆破压力下，由于火焰与声相互作用引起的内火焰振荡导致压力上升率在2000 Hz左右振荡，而在高爆破压力下这种振荡几乎消失。外火焰传播速度并不随距离喷口距离的增加而单调减小，最大外火焰长度与喷口爆破压力几乎无关。版权所有（C）2015，氢能出版物有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Effect of vent burst pressure on internal pressure and flame evolution is experimentally investigated during explosion venting of rich hydrogen-air mixtures with equivalence ratio of 2 in a cylindrical vessel with a neck. Experimental results show that four pressure peaks are observed at the vessel exit under low vent burst pressures, corresponding to the following four successive stages: the vent failure, the venting of the burned gases, the maximum production rate of burned gas in vessel and the suction of gases into vessel. But under high vent burst pressure, the second and third pressure peaks disappear and the first one becomes dominant. The fourth pressure peak due to suction is kept around several kilopascals. The pressure in vessel is always characterized by single pressure peak which increases with the increase of the vent burst pressure. Under low vent burst pressures, the oscillation of internal flame due to flame-acoustic interaction results in oscillation of pressure rise rate in about 2000 Hz, and the oscillation nearly disappears under high vent burst pressures. The external flame speed does not decrease monotonously as the increase of distance away from the vent, and the maximum length of external flame is nearly independent of vent burst pressure. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.