铰链式容器中氢气浓度对H2/空气通风爆炸火焰传播和压力演化的影响

IF 8.3 2区 工程技术 Q1 CHEMISTRY, PHYSICAL
Zelong Wu , Yanzhen Zhuang , Jin Guo
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引用次数: 0

摘要

本文研究了氢气浓度(C)为9% ~ 27%的H2/空气混合物排气爆炸过程中的压力演化和火焰传播行为。实验在一个1立方米的容器中进行,该容器配有一个由4毫米厚的铰链铝板覆盖的通风口。结果表明,在排气爆炸过程中,有三个明显的内压力峰:P1(第一个压力峰)、P2(第二个压力峰)和P3(第三个压力峰)。当C超过12%时,P2取代P3成为容器内的最高压力峰值。当C从9%增加到27%时,P1在压力分布中变得难以区分。Cubbage和Marshall提出的最大压力公式准确地预测了容器内的最大爆炸超压(Pmax)。在外部压力曲线中,观察到最大外部压力峰值(Pext)。随着C的增加,ext从C = 15%时的4.8 kPa上升到C = 27%时的49.9 kPa。此外,随着C的增加,最大外焰速度从C = 21%时的170 m/s增加到C = 27%时的236 m/s。当C由18%增加到27%时,最大外焰长度(Lmax)由1.5 m增加到2.0 m。在无惯性排气实验中,火球与外部爆炸同步,呈蘑菇状。当使用铰链面板时,随着C的减小,火球在通风口处逐渐变平。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of hydrogen concentration on flame propagation and pressure evolution during vented H2/air explosions in a vessel with a hinged panel

Effects of hydrogen concentration on flame propagation and pressure evolution during vented H2/air explosions in a vessel with a hinged panel
This paper investigates the pressure evolution and flame propagation behavior during the vented explosion of H2/air mixtures with hydrogen concentrations(C) ranging from 9 % to 27 %. The experiments were conducted in a 1 m3 vessel equipped with a vent covered by a 4-mm thick hinged aluminum panel. The results reveal three distinct internal pressure peaks during the vented explosion: P1 (the first pressure peak), P2 (the second pressure peak), and P3 (the third pressure peak). When C exceeds 12 %, P2 replaces P3 as the highest-pressure peak within the vessel. As C increases from 9 % to 27 %, P1 becomes less distinguishable in the pressure profiles. The maximum pressure formula proposed by Cubbage and Marshall accurately predicts the maximum explosion overpressure (Pmax) within the vessel. In the external pressure profiles, a maximum external pressure peak (Pext) is observed. As C increases, Pext rises from 4.8 kPa at C = 15 % to 49.9 kPa at C = 27 %. Additionally, as C increases, the maximum external flame speed increases from 170 m/s at C = 21 % to 236 m/s at C = 27 %. When C increases from 18 % to 27 %, the maximum external flame length(Lmax)increases from 1.5 m to 2.0 m. During the inertia-free venting experiments, the fireball, synchronized with the external explosion, assumes a mushroom shape. When hinged panels are used, the fireball becomes progressively flatter at the vent as C decreases.
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来源期刊
International Journal of Hydrogen Energy
International Journal of Hydrogen Energy 工程技术-环境科学
CiteScore
13.50
自引率
25.00%
发文量
3502
审稿时长
60 days
期刊介绍: The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.
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