障碍物交错阵列内气体爆燃转爆轰研究

李敏; 肖华华

doi:10.11883/bzycj-2024-0284

障碍物交错阵列内气体爆燃转爆轰研究

doi: 10.11883/bzycj-2024-0284

李敏^{1, 2,},
肖华华^1, ,

1.
中国科学技术大学火灾安全全国重点实验室，安徽合肥 230026
2.
特种焊接技术安徽省重点实验室，安徽淮南 232063

基金项目: 国家自然科学基金（12302449）；安徽省自然科学基金（2308085QE170）；特种焊接技术安徽省重点实验室开放基金（2023SW1002）

详细信息

作者简介:
李　敏（1988－　），男，博士，副研究员，lim2010@ustc.edu.cn

通讯作者:
肖华华（1984－　），男，博士，教授，xiaoh@ustc.edu.cn

中图分类号: O381
计量
- 文章访问数: 155
- HTML全文浏览量: 19
- PDF下载量: 32
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-13
- 修回日期: 2025-02-09
- 网络出版日期: 2025-02-17

Study on deflagration-to-detonation transition in a staggered array of obstacles

LI Min^{1, 2
,},
XIAO Huahua^{1
, ,}

1.
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, Anhui, China
2.
Anhui Province Key Laboratory of Special Welding Technology, Huainan 232063, Anhui, China

摘要

摘要: 鉴于目前对障碍物交错阵列内爆燃转爆轰（deflagration-to-detonation transition，DDT）现象的认识不足，采用高精度算法和动态自适应网格求解完全可压缩反应性Navier-Stokes方程，对不同障碍物间距条件下方形障碍物交错阵列内预混氢-空气DDT引发过程进行数值模拟研究。结果表明：减小障碍物间距有利于在火焰加速前期增加火焰面积、后期增强激波压缩未燃气体，从而缩短DDT时间和距离。不过，当障碍物间距减小至一阈值时，会出现结巴式爆轰，使DDT距离增加。DDT主要由障碍物前壁的反射激波与火焰相互作用引起。爆轰绕过障碍物时发生局部解耦，然后，与壁面或来自障碍物另一侧的激波和失效爆轰波碰撞时可能引发爆轰再起爆。若障碍物间距太小，激波强度随爆轰的解耦而衰减严重，易导致爆轰失效。方形障碍物交错阵列比圆形更易引发DDT，因前者可在垂直和平行于火焰的传播方向产生反射激波，有助于激波作用于火焰和未燃气体。
- 爆燃转爆轰 /
- 火焰加速 /
- 激波 /
- 障碍物阵列 /
- 氢气
Abstract: Study on gas deflagration-to-detonation transition (DDT) is of great significance for the research and development of industrial explosion prevention and detonation propulsion technology. Staggered array of obstacles is a typical obstacle layout that may be involved in the gas ignition and explosion scenario. Its existence usually significantly promotes the occurrence of DDT. In view of the lack of understanding of DDT in staggered array of obstacles, high-precision algorithm and dynamic adaptive grid were applied to solve the two-dimensional, fully compressible reactivity Navier-Stokes equations coupled with a calibrated chemical-diffusive model. Numerical investigation on the initiation process of DDT of premixed hydrogen and air in staggered array of square obstacles under different obstacle spacings was carried out. The results showed that decreasing obstacle spacing is beneficial to increase flame surface area in the early stage of flame acceleration and enhance compression of unburned gas by shock wave in the later stage, thus shortening DDT run-up time and distance. However, when the obstacle spacing is reduced to a threshold value, stuttering detonation occurs and the DDT run-up distance increases. The occurrence of DDT is mainly caused by the interaction between the flame and the shock wave reflected from the front wall of obstacle. The detonation partially decouples when it diffracts around an obstacle. Detonation re-initiation may be triggered when the decoupled detonation collides with a wall or with the shock wave or failure detonation wave from the other side of the obstacle. If the obstacle spacing is too small, the shock wave intensity decays significantly during detonation decoupling. This can easily lead to detonation failure. In addition, shock waves can be reflected off the staggered array of square obstacles in the vertical and parallel directions to the flame propagation direction, which help shock waves to act on the flame and unburned gas mixture. Therefore, DDT is more likely to be initiated in the staggered array of square obstacles than that of circular obstacles.
- deflagration-to-detonation transition /
- flame acceleration /
- shock wave /
- obstacle array /
- hydrogen

HTML全文

图 1 计算域示意图（单位：mm）

Figure 1. Computational zone (unit: mm)

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图 2 火焰位置和传播速度随时间的变化

Figure 2. Flame position and propagation speed as a function of time

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图 3 火焰表面积和总热释放速率随时间的变化

Figure 3. Flame surface area and total heat release as a function of time

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图 4 火焰的加速过程

Figure 4. Acceleration process of flame

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图 5 DDT过程

Figure 5. Process of DDT

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图 6 温度场显示爆轰传播过程

Figure 6. Temperature filed showing the propagation of detonation

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图 7 方形与圆形障碍物阵列不同障碍物间距下火焰位置随时间变化

Figure 7. Flame position as a function of time in square and circular obstacle array under different obstacle spacings

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图 8 方形与圆形障碍物阵列不同障碍物间距下的DDT时间与距离

Figure 8. DDT time and distance in square and circular obstacle array under different obstacle spacings

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图 9 方形和圆形障碍物阵列内火焰速度和表面积随时间的变化

Figure 9. Flame speed and surface area as a function of time in the square and circular obstacle array

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图 10 方形和圆形障碍物阵列内火焰传播比较

Figure 10. Comparison of flame propagation in array of square and circular obstacles

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