城市地下排水管道中燃气爆炸及气-液两相耦合作用规律

周刚; 孔阳; 崔洋洋; 钱新明; 傅砺烨; 张琦

doi:10.11883/bzycj-2023-0123

城市地下排水管道中燃气爆炸及气-液两相耦合作用规律

doi: 10.11883/bzycj-2023-0123

周刚^{1, 2,},
孔阳^{1, 2},
崔洋洋³,
钱新明⁴,
傅砺烨⁴,
张琦^{1, 2, 4, ,}

1.
山东科技大学安全与环境工程学院, 山东青岛 266590
2.
山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地, 山东青岛 266590
3.
应急管理部研究中心, 中国煤炭工业发展研究中心, 北京 100713
4.
北京理工大学爆炸科学与技术国家重点实验室, 北京 100081

基金项目: 国家自然科学基金（52204227）；山东省自然科学基金（ZR2022QE220）；北京理工大学爆炸科学与技术国家重点实验室开放基金（KFJJ23-23M）

详细信息

作者简介:
周　刚（1979－　），男，博士，教授，zhougang@sdust.edu.cn

通讯作者:
张　琦（1991－　），男，博士，教授，zhangqi2021@sdust.edu.cn

中图分类号: O389
计量
- 文章访问数: 369
- HTML全文浏览量: 96
- PDF下载量: 112
- 被引次数: 0
出版历程
- 收稿日期: 2023-04-07
- 修回日期: 2023-09-05
- 网络出版日期: 2023-11-15
- 刊出日期: 2024-03-14

The law of gas explosion and gas-liquid coupling in urban underground drainage pipelines

ZHOU Gang^{1, 2
,},
KONG Yang^{1, 2},
CUI Yangyang³,
QIAN Xinming⁴,
FU Liye⁴,
ZHANG Qi^{1, 2, 4
, ,}

1.
College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
2.
State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
3.
China Center for Safety Research, Ministry of Emergency Management of the People’s Republic of China and China Coal Strategic Research Center, Beijing 100713, China
4.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 为研究城市地下排水管道中燃气爆炸传播特性和气-液两相耦合作用规律，基于气-液两相流理论和计算流体力学方法，对不同水深率下的天然气/空气混合物的爆炸-加速-衰减过程进行了数值模拟。研究结果表明：当水深率小于0.7时，随着水深率的增加，气相空间的长径比增大，燃料燃烧加剧，火焰的加速现象逐渐显著，导致峰值超压逐渐增大，超压峰值显现时间逐渐缩短，且峰值超压沿轴向的提升效果更加显著；当水深率达到0.7时，火焰在管道内的传播明显受阻，水震荡产生的波动及细水柱迅速占据了有限的气相空间，阻断了火焰的自维持传播，使得爆炸超压仅在点火源附近显现。不同水深率条件下，管道中相同区域内，同一时刻水面被扬起的高度和气相区域的速度场不同，被卷扬起的低温液体对其相邻区域的高温火焰形成降温和阻断，之后由于气体的宏观流动，与液面相邻的低温气体流动至管道内高温区域，进而造成管道内火焰温度降低，同时，水的震荡和细水柱的飞扬大大降低了爆炸超压风险。
- 城市排水管道 /
- 天然气爆炸 /
- 爆炸超压 /
- 火焰熄灭
Abstract: There are frequent gas explosion accidents in urban rain and sewage drainage pipes, which pose a serious threat to people’s lives and property safety. To study the propagation characteristics of gas explosion and the law of gas-liquid two-phase coupling in urban underground drainage pipes, based on the gas-liquid two-phase flow theory and computational fluid dynamics method, a numerical simulation study of the explosion-acceleration-decay process of gas/air mixture under different water depth ratio was conducted. The results show that when the water depth ratio is less than 0.7, as the water depth ratio increases, the long-diameter ratio of the gas phase space increases, the fuel combustion intensifies, and the flame acceleration phenomenon gradually becomes significant, which leads to a gradual increase in peak overpressure, a gradual reduction in peak overpressure time, and a more significant effect of peak overpressure along the axial direction. When the water depth ratio reaches 0.7, the propagation of the flame in the pipeline is blocked, and the fluctuation caused by the water shock and the fine water column quickly occupy a small gas phase space, blocking the continuous propagation of the flame, which makes the explosion overpressure appear only near the ignition source. Under different water depth ratios, in the same zone of the pipeline and at the same moment, the height of the water being rolled up and the velocity field of the gas phase region is different, and the cryogenic liquid is rolled up to cool and block the high-temperature flame in the adjacent zone. Then, due to the macroscopic flow of the gas, the cryogenic gas adjacent to the liquid surface flows to the high-temperature region in the pipeline, resulting in a decrease in the flame temperature in the pipeline. The shock of water and the flying of fine water columns greatly reduce the risk of explosion overpressure. The research results provide a scientific basis for the explosion protection of urban gas lifelines.
- urban drainage pipeline /
- natural gas explosion /
- explosion overpressure /
- flame extinction

HTML全文

图 1 不同水深率条件下含水管道气体爆炸与传播的物理模型

Figure 1. Physical models for gas explosion and propagation in water-bearing pipelines under different water depth ratios

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图 2 不同网格划分方案下的网格分布特征

Figure 2. Mesh distribution characteristics under different meshing schemes

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图 3 不同网格划分方案下各测点超压峰值及相对变化率

Figure 3. Peak overpressures and relative change ratio at each measuring pointunder different meshing schemes

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图 4 含水管道气体爆炸与传播实验平台示意图

Figure 4. Schematic diagram of the experimental platform for gas explosion and propagation in a water-bearing pipeline

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图 5 不同测点处超压峰值的实验及模拟值

Figure 5. Experimental and simulated values of peak overpressure at different measuring points

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图 6 不同水深率时管道内不同位置超压随时间变化曲线

Figure 6. Time variation curves of overpressure at different positions in the pipeline under different water depth ratios

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图 7 水深率不同时各轴向测点的峰值超压以及超压峰值到达时刻随轴向距离的演化

Figure 7. Evolution of peak overpressure and peak overpressure arrival time with axial distanceat each axial measuring point under different water depth ratios

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图 8 不同水深率条件下管道内不同时刻的温度与水的体积分数云图

Figure 8. Contous of temperature and water volume fraction at different times in the pipeline under different water depth ratios

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图 9 水深率不同时管道内点火后不同时刻火焰锋面位置及火焰速度

Figure 9. Flame front position and flame velocity at different times after ignition in the pipeline with different water depth ratios

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图 10 水深率不同时温度峰值随火焰轴向传播距离的变化

Figure 10. Variation of temperature peak with flame axial propagation distance under different water depth ratios

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图 11 不同水深率时点火后管道内不同位置处温度随时间的变化曲线

Figure 11. Variation curves of temperature with time at different positions in the pipeline after ignition under different water depth ratios

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表 1 水深率不同时管道内不同测点处的温度峰值

Table 1. Temperature peak at different measuring points in the pipeline under different water depth ratios

水深率	不同测点的温度峰值/K
水深率	0.4 m	0.7 m	1.0 m	1.3 m	1.6 m	1.9 m	2.2 m	2.5 m	2.8 m
0.2	3 117.6	3 082.4	3 336.6	3 216.4	2 760.8	2 778.5	2 757.1	490.8	510.9
0.3	3 029.9	3 128.6	3 190.2	3 086.7	2 622.4	2 664.6	2 717.9	2 801.7	536.2
0.4	2 832.4	3 102.3	3 062.2	3 126.8	2 657.6	2 745.1	2 856.3	2 892.2	557.7
0.5	2 800.9	3 102.2	3 077.3	2 925.4	2 652.6	2 641.6	2 552.3	2 860.3	556.1
0.6	2 650.7	2 777.9	2 395.2	2 983.2	2 883.8	2 978.6	2 770.4	2 552.8	547.0
0.7	1 978.3	469.3	316.2	312.3	313.2	313.8	314.9	310.9	310.7

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