Sun Han, Yang Guogang, Ma Xiangkun, Sheng Zhonghua, Li Shian, Cui Ying, Xv Zhuangzhuang, Yang Xiaoxing, Wang Hao, Qi Baiyi
Marine Engineering College, Dalian Maritime University, Dalian 116000, China.
Transportation Engineering College, Dalian Maritime University, Dalian 116000, China.
ACS Omega. 2024 Sep 6;9(38):39743-39756. doi: 10.1021/acsomega.4c04972. eCollection 2024 Sep 24.
Explosion venting is an effective method to reduce the explosion damage; in order to study the mechanism of an explosion venting process in internal and external space, this paper investigates the influence of vent parameters on hydrogen-air explosion in a rectangular duct through numerical simulation. The model including the internal and external space is first constructed, and then the explosion dynamic behaviors of the full flow field are analyzed under different vent pressures and sizes. The study aims to reveal the coupling effect of the flame, pressure, and flow field on hydrogen explosion venting. The results indicate that the explosion intensity increases with the growth of the vent pressure and the reduction of the vent size. The maximum external overpressure increases to 2.6 and 2.3 times as the vent pressure increased to 10 times or vent size reduced by 90%. The flame and combustible gas mixture evolve from a mushroom cloud into a jet form as the vent size decreases, and vortexes formed at the flame front suppress flame propagation. However, the flame speed increases significantly as the flame passes the vent under the impact of larger pressure gradient, which results in a more violent turbulence intensity and secondary external explosion.
泄爆是一种减少爆炸破坏的有效方法；为了研究内部和外部空间中泄爆过程的机理，本文通过数值模拟研究了泄爆参数对矩形管道内氢-空气爆炸的影响。首先构建了包含内部和外部空间的模型，然后分析了不同泄爆压力和尺寸下全流场的爆炸动力学行为。该研究旨在揭示火焰、压力和流场对氢爆炸泄爆的耦合作用。结果表明，爆炸强度随着泄爆压力的增加和泄爆尺寸的减小而增大。当泄爆压力增加到10倍或泄爆尺寸减小90%时，最大外部超压分别增加到2.6倍和2.3倍。随着泄爆尺寸减小，火焰和可燃气体混合物从蘑菇云演变为射流形式，并且在火焰前沿形成的涡旋抑制火焰传播。然而，在较大压力梯度的作用下，火焰通过泄爆口时火焰速度显著增加，这导致更强烈的湍流强度和二次外部爆炸。
