约束端面对管内甲烷爆炸特性的影响

王亚磊; 郑立刚; 于水军; 朱小超; 李刚; 杜德朋; 窦增果

doi:10.11883/bzycj-2018-0249

约束端面对管内甲烷爆炸特性的影响

doi: 10.11883/bzycj-2018-0249

王亚磊^1,,
郑立刚^{1, 2, ,},
于水军^{1, 2},
朱小超¹,
李刚¹,
杜德朋¹,
窦增果¹

1.
河南理工大学瓦斯地质与瓦斯治理国家重点实验室培育基地，河南焦作 454003
2.
河南理工大学煤炭安全生产河南省协同创新中心，河南焦作 454003

基金项目: 国家自然科学基金（51674104，51504083）；中国博士后基金(2013M540570)；河南省高等学校青年骨干教师项目（2012GGJS-053）；河南理工大学创新型科研团队（T2018-2）

详细信息

作者简介:
王亚磊（1991－　），男，硕士研究生，2575635245@qq.com

通讯作者:
郑立刚（1979－　），男，博士，教授，zhengligang97@163.com

中图分类号: O381; TD712
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- 被引次数: 0
出版历程
- 收稿日期: 2018-07-10
- 修回日期: 2018-09-12
- 刊出日期: 2019-09-01

Effect of vented end faces on characteristics of methane explosion in duct

WANG Yalei^1
,,
ZHENG Ligang^{1, 2
, ,},
YU Shuijun^{1, 2},
ZHU Xiaochao¹,
LI Gang¹,
DU Depeng¹,
DOU Zengguo¹

1.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
Collaborative Innovation Center of Coal Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo 454003, Henan, China

摘要

摘要: 为研究不同约束端面下甲烷的爆炸特性，利用自行搭建的实验平台完成了多种约束端面下不同浓度甲烷的爆炸实验。研究表明：约束端面的性质对甲烷的爆炸特性有显著影响，约束端面的承压强度越高，甲烷的爆炸超压越大。单层PVC薄膜作用下，薄膜破裂，不会引起火焰与超压的振荡；而纸膜破裂后，管道内外气流的高速泄放和回流则会引起超压振荡，使火焰前锋波动并发生扭曲变形；两者共同作用时，PVC薄膜会阻碍气流的泄放与回流，加速超压衰减，抑制火焰和超压的振荡。然而，随着纸膜层数增加，破膜时管道内外形成的巨大压差会使约束端面完全破裂，降低PVC薄膜的抑制作用。当破膜难度达到一定程度时，约束端面作用下的泄压峰值成为不同浓度甲烷爆炸的最大超压峰值，且泄爆压力并不随甲烷浓度的改变而改变，因此不同浓度甲烷的爆炸超压在较高的泄爆压力下相同；此时，相同约束端面下不同浓度甲烷的压力振荡曲线在压力衰减的前半个周期内完全重合，管道内外的压差成为主导超压振荡的重要因素，而不同浓度甲烷的燃烧速率对超压振荡的影响则可以忽略不计。
- 约束端面 /
- 甲烷 /
- 爆炸 /
- 耦合分析 /
- 火焰传播 /
- 压力振荡
Abstract: In order to study the characteristics of methane explosion under different vented end faces, explosion tests of methane with different concentrations are carried out in a vertical 5 L quartz duct with the upper end sealed by different films. The results show that the properties of the vented end faces have significant effects on methane explosion. The explosion overpressure of methane with different concentrations is largely dependent upon the vent burst pressure of the vented end faces, which increases with the increasing vent burst pressure. Specially, by covering the end of the duct by a single layer of PVC film, neither the flame nor the overpressure oscillation will be aroused by the rupture of the PVC film, while the rupture of the paper which generates drastic discharge and reflux of the air flow will severely reverse and distort the flame, such that cause the overpressure oscillation in the duct. Moreover, as the two works together, the PVC film will hinder the venting of the air flow, resulting in accelerating the reduction of the overpressure and suppressing the flame and overpressure oscillation. However, this effect gradually decreases with the increasing layers of paper films. Indeed, as the vent burst pressure reaches a certain value, the difference among the explosion overpressure of different concentrations of methane gradually diminishes owing to the same vent burst pressure, which is the maximum pressure of the overpressure history, resulting in a similar overpressure amongst different concentrations of methane. Significantly, the overpressure attenuation curves of methane explosion with different concentrations completely coincide with each other in the first half of the period. At this point, the differential overpressure between the internal and external duct is the key factor leading to the overpressure oscillation, while the influence of the combustion rate of methane with different concentrations on the overpressure oscillation can be ignored.
- confined film /
- methane /
- explosion /
- coupling analysis /
- flame propagation /
- overpressure oscillation

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图 1 实验装置示意图

Figure 1. Schematic diagram of experimental setup

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图 2 不同材质薄膜的破裂分析

Figure 2. Fracture analysis of films with different materials

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图 3 薄膜破裂形态

Figure 3. Morphology of the ruptured films

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图 4 单层纸膜密封下6.5%的甲烷爆炸时上、下两压力传感器所测的压力曲线

Figure 4. Pressure profiles of 6.5% methane explosion measured by the two pressure gauges with the upper end sealed by a layer of paper

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图 5 单层PVC薄膜下9.5%的甲烷爆炸火焰与压力耦合图

Figure 5. Coupled relationship between flame propagation and overpressure history of 9.5% methane explosionsealed by a single layer of PVC film

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图 6 单层纸膜下6.5%的甲烷爆炸火焰与压力耦合图

Figure 6. Coupled relationship between flame propagation and overpressure history of 6.5% methane explosion sealed by a single layer of paper

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图 7 单层纸膜密封下6.5%的甲烷爆炸火焰传播

Figure 7. Flame propagation of 6.5% methane explosion sealed by a single layer of paper

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图 8 不同约束端面下11.5%的甲烷爆炸火焰传播

Figure 8. Flame propagation of 11.5% methaneunder different confined surfaces

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图 9 不同约束端面下7.5%的甲烷爆炸超压变化

Figure 9. Explosion overpressure of 7.5% methane under different confined surfaces

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图 10 不同约束端面下甲烷爆炸超压衰减

Figure 10. Explosion overpressure damping process of methane sealed by different films

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表 1 多种约束端面下不同浓度甲烷的爆炸超压

Table 1. Explosion overpressure of methane at different concentrations with the upper end sealed by different materials

甲烷浓度/%	爆炸压力/kPa
甲烷浓度/%	1层PVC薄膜	1层纸膜	1层PVC薄膜+1层纸膜	1层PVC薄膜+2层纸膜	1层PVC薄膜+3层纸膜	1层PVC薄膜+4层纸膜
6.5	6.7	15.3	19.4	34.3	52.2	69.2
7.5	6.7	14.2	18.7	33.6	57.7	70.0
9.5	7.7	15.2	20.1	33.7	55.4	70.2
11.5	6.8	14.9	19.4	35.4	57.0	70.6

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