惰性气体和水蒸气对长直空间燃气爆炸超压及其振荡的抑制作用

刘洋; 李展; 方秦; 王森佩; 陈力

doi:10.11858/gywlxb.20200654

惰性气体和水蒸气对长直空间燃气爆炸超压及其振荡的抑制作用

doi: 10.11858/gywlxb.20200654

刘洋^1,,
李展^1,*, ,,
方秦¹,
王森佩¹,
陈力²

1.
陆军工程大学爆炸冲击防灾减灾国家重点实验室，江苏南京　210007
2.
东南大学爆炸安全防护教育部工程研究中心，江苏南京　211189

基金项目: 江苏省自然科学基金（BK20190571）；国家自然科学基金（52008392）

详细信息

作者简介:
刘　洋（1996－），男，硕士研究生，主要从事燃气爆炸荷载研究. E-mail：20145035@cqu.edu.cn

通讯作者:
李　展（1990－），男，博士，讲师，主要从事燃气爆炸灾害效应研究. E-mail：lz.9008@163.com

中图分类号: O381; TD712
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出版历程
- 收稿日期: 2020-12-11
- 修回日期: 2021-01-13

Inert Gas and Water Vapor Suppressing Overpressure and Its Oscillation of Gas Explosion in Long Straight Space

LIU Yang^1
,,
LI Zhan^{1,*
, ,},
FANG Qin¹,
WANG Senpei¹,
CHEN Li²

1.
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
2.
Engineering Research Center of Safety and Protection of Explosion & Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China

摘要

摘要: 长直空间燃气爆炸超压及其振荡将对人员和结构安全产生不利影响。为减轻燃气爆炸危害，基于CFD软件FLACS建立了长直管道空间燃气爆炸数值模型，并对模型进行了验证。利用已验证的数值模型，研究了添加不同体积分数CO₂、N₂和水蒸气的化学当量比CH₄/空气混合气体的爆炸，讨论了惰性气体和水蒸气的体积分数对爆炸超压及其振荡的影响，并对比了3种气体的抑爆效果。结果表明：CO₂、水蒸气和N₂的体积分数每增加10%，密闭管道气体爆炸的最终超压将分别下降81、47、65 kPa，尾端泄爆管道分别下降24、25、20 kPa，3种气体的体积分数分别为25%、26%、30%时，爆炸被完全抑制；CO₂、水蒸气和N₂均能有效抑制爆炸超压的振荡，压力振幅和压力振荡频率均随添加气体体积分数的增加而减小；CO₂对爆炸超压及其振荡的抑制效果最好，水蒸气次之，N₂最弱，这与3种气体的物理特性及其抑爆机理的差异有关。
- 水蒸气 /
- 惰性气体 /
- 燃气爆炸抑制 /
- FLACS /
- 压力振荡
Abstract: The overpressure and its oscillation of gas explosion in long straight space will endanger personnel and structures. In order to reduce the potential hazards, a numerical model of gas explosions in long straight tube was established based on the CFD software FLACS and was verified by using the existing experimental data. Based on the validated numerical models, the suppression of CO₂, N₂ and water vapor on the CH₄/air mixture explosions with stoichiometric concentration was investigated. The influence of the volume fraction of inert gas and water vapor on the explosion overpressure and its oscillation was considered and discussed. It is shown that for every 10% increase in the volume fraction of CO₂, water vapor and N₂, the final overpressure of the gas explosion in the closed tube drops by 81, 47 and 65 kPa, the final overpressure in the end-vented tube decreases by 81, 47 and 65 kPa. When the volume fractions of CO₂, water vapor and N₂ are 25%, 26%, and 30%, respectively, the explosion is completely suppressed. CO₂, water vapor and N₂ can effectively suppress the oscillation of explosive overpressure, both the pressure amplitude and the pressure oscillation frequency decrease with the increase of the volume fraction of added gas. CO₂ has the best suppression effect on explosion overpressure and its oscillation, followed by water vapor, and N₂ is the weakest. This phenomenon is related to the differences in the physical properties of the three gases and the suppression mechanisms.
- water vapor /
- inert gas /
- gas explosion suppression /
- FLACS /
- pressure oscillation

HTML全文

图 1 管道模型及其网格划分

Figure 1. Tube model and its meshing

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图 2 模型验证工况^[38]

Figure 2. Cases of model verification^[38]

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图 3 模型验证（测点1）

Figure 3. Numerical model verification (pressure sensor 1)

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图 4 混合气体体积示意图

Figure 4. Diagram of premixed gas volume

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图 5 不同CO₂体积分数条件下的超压时程曲线

Figure 5. Overpressure-time history curves of CO₂ with different volume fractions

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图 6 最终超压及升压时间随CO₂体积分数的变化

Figure 6. Change of final overpressure and pressure rising time with CO₂ volume fraction

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图 7 不同CO₂体积分数下超压振幅随时间的变化

Figure 7. Variation of overpressure amplitude of different volume fractions of CO₂ with time

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图 8 不同CO₂体积分数下超压振荡频率随时间的变化

Figure 8. Variation of overpressure oscillation frequency of different volume fractions of CO₂ with time

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图 9 不同N₂体积分数条件下的超压时程曲线

Figure 9. Overpressure-time history curves of N₂ with different volume fractions

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图 10 最终超压及升压时间随N₂体积分数的变化

Figure 10. Change of final overpressure and pressure rising time with N₂ volume fraction

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图 11 不同N₂体积分数下超压振幅随时间的变化

Figure 11. Variation of overpressure amplitude of different volume fractions of N₂ with time

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图 12 不同N₂体积分数下超压振荡频率随时间的变化

Figure 12. Variation of overpressure oscillation frequency of different volume fractions of N₂ with time

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图 13 不同水蒸气体积分数条件下的超压时程曲线

Figure 13. Overpressure-time history curves of N₂ with different volume fractions

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图 14 最终超压及升压时间随水蒸气体积分数的变化

Figure 14. Change of final overpressure and pressure rising time with water vapor volume fraction

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图 15 不同水蒸气体积分数下超压振幅随时间的变化

Figure 15. Variation of overpressure amplitude of different volume fractions of water vapor with time

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图 16 不同水蒸气体积分数下超压振荡频率随时间的变化

Figure 16. Variation of overpressure oscillation frequency of different volume fractions of water vapor with time

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图 17 不同CO₂体积分数条件下的超压时程曲线

Figure 17. Overpressure-time history curves of CO₂ with different volume fractions

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图 18 最终超压和升压时间随CO₂体积分数的变化

Figure 18. Change of final overpressure and pressure rising time with CO₂ volume fraction

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图 19 不同CO₂体积分数下超压振幅随时间的变化

Figure 19. Variation of overpressure amplitude of different volume fractions of CO₂ with time

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图 20 不同CO₂体积分数下超压振荡频率随时间的变化

Figure 20. Variation of overpressure oscillation frequency of different volume fractions of CO₂ with time

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图 21 不同N₂体积分数条件下的超压时程曲线

Figure 21. Overpressure-time history curves of N₂ with different volume fractions

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图 22 最终超压及升压时间随N₂体积分数的变化

Figure 22. Change of final overpressure and pressure rising time with N₂ volume fraction

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图 23 不同N₂体积分数下超压振幅随时间的变化

Figure 23. Variation of overpressure amplitude of different volume fractions of N₂ with time

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图 24 不同N₂体积分数下超压振荡频率随时间的变化

Figure 24. Variation of overpressure oscillation frequency of different volume fractions of N₂ with time

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图 25 不同水蒸气体积分数条件下的超压时程曲线

Figure 25. Overpressure-time history curves of water vapor with different volume fractions

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图 26 最终超压及升压时间随水蒸气体积分数的变化

Figure 26. Change of final overpressure and pressure rising time with water vapor volume fraction

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图 27 不同水蒸气体积分数下超压振幅随时间的变化

Figure 27. Variation of overpressure amplitude of different volume fractions of water vapor with time

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图 28 不同水蒸气体积分数下超压振荡频率随时间的变化

Figure 28. Variation of overpressure oscillation frequency of different volume fractions of water vapor with time

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图 29 密闭管道内CO₂、N₂和水蒸气对爆炸的抑制作用对比

Figure 29. Comparison of suppression of CO₂, N₂ and water vapor on the explosion in the closed tube

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图 30 尾端泄爆管道内CO₂、N₂和水蒸气对爆炸的抑制作用对比

Figure 30. Comparison of suppression of CO₂, N₂ and water vapor on the explosion in the end-vented tube

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表 1 添加气体的体积分数（密闭/泄爆）

Table 1. Volume fraction of added gas (closed/end-vented) %　

CO₂ N₂ Water vapor (H₂O) CO₂ N₂ Water vapor (H₂O)

0 0 0 20 25 20
4 5 4 24 30 24
8 10 8 25 31 26
12 15 12 27
16 20 16

下载: 导出CSV

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