Page 160 - 《爆炸与冲击》2023年第2期

第 43 卷 第 2 期 爆 炸 与 冲 击 Vol. 43, No. 2
2023 年 2 月 EXPLOSION AND SHOCK WAVES Feb., 2023

DOI：10.11883/bzycj-2022-0174

破膜压力对氢-空气预混气体燃爆特性的影响 *

杜赛枫 ，张 凯 ，陈 昊 ，郭 进 ，段在鹏 2
1
1
1
1
（1. 福州大学环境与安全工程学院，福建 福州 350116；
2. 福州大学经济与管理学院，福建 福州 350116）
摘要： 利用自主设计的 5.00 m 长矩形管道，对氢气体积分数为 30% 的氢气-空气预混气体进行了不同破膜压力
（p v ）下的系列燃爆实验，重点研究了 p v 对管道内外火焰传播行为及爆炸超压的影响。实验结果表明：管道内的火焰传
播行为受 p v 影响显著。在靠近泄爆口的压力传感器所监测的压力-时间曲线上，可以观察到 3 个压力峰值（p b 、p out 、
p ext ），分别对应于铝膜破裂、燃烧混合物泄放以及外部爆炸，大多数情况下，p b 为最大压力峰值。管道内部最大超压随
着 p v 升高而增大，但最大内部超压出现的位置受 p v 的影响。管道外部火焰传播行为与 p v 有关，但不同 p v 下外部火焰
的最大长度无明显差异。最大外部超压与 p v 之间呈现非单调变化规律。
关键词： 氢气；破膜压力；火焰传播；爆炸超压；外部爆炸
中图分类号： O382.1 国标学科代码： 1303520 文献标志码： A

Effects of vent burst pressure on explosion characteristics
of premixed hydrogen-air gases

1
1
1
1
DU Saifeng , ZHANG Kai , CHEN Hao , GUO Jin , DUAN Zaipeng 2
(1. College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350116, Fujian, China;
2. School of Economics and Management, Fuzhou University, Fuzhou 350116, Fujian, China)
Abstract: By using a self-designed 5.00-m-long duct with a cross-section of 0.30 m × 0.30 m, a seris of experiments were
performed on premixed hydrogen-air gases in which volume fraction of hydrogen was 30%. And the effects of vent burst
pressure (p ) on the flame propagation and pressure-time histories in the duct were experimentally iveatigated. The explosion
v
flames were recorded by a high-speed camera at a frequency of 2.5 kHz. Five piezoelectric pressure transducers were employed
to record the internal and external overpressure. The duct had been evacuated using a vacuum pump before the experiment, and
the premixed hydrogen-air gases with volume fraction of 30% was prepared according to Dalton’s law of partial pressure. The
variation of the vent burst pressure was achieved by changing the thickness of the aluminum foil which was used as vent cover.
The results show that the first three stages of the flame structure in the duct are hemispherical, finger-shaped and tulip flame,
respectively. p has a significant effect on the structure of tulip flame and its subsequent development. Three pressure peaks (p , b
v
p , p ) can be distinguished from the pressure-time histories monitored by the pressure transducer near the vent,
out
ext
corresponding to three different generation mechanisms: burst of the aluminum film, venting of burned mixtures, and the
external explosion, respectively. The three pressure peaks increase with an increase in p . p is the dominant pressure peak in
v b
most cases. The maximum internal overpressure increases as p increases, and the position where the maximum internal
v
overpressure was measured depended on p . The maximum internal overpressure was obtained at the center of the duct (PT2)
v
when p ≤42 kPa, but near the open end of the duct (PT3) if p ＞42 kPa. When the flame reached the vent, it ejected from the
v
v
* 收稿日期： 2022-04-24；修回日期： 2022-10-11
基金项目： 国家社会科学基金（17CGL049）
第一作者： 杜赛枫（1997－ ），男，硕士研究生，1095290649@qq.com
通信作者： 段在鹏（1985－ ），男，博士，副教授，duanzaipeng@163.com

025401-1