Effect of obstacles on flame acceleration of propane-air explosion
-
摘要: 研究了障碍物阻塞率、障碍物间距、障碍物空间位置对丙烷-空气爆炸过程及火焰加速效应的影响。采用雷诺平均（RANS）方程和湍流火焰封闭燃烧模型计算非稳态燃烧过程，主要分析障碍物周围复杂流场特性以及湍流涡与火焰面作用的详细机理。结果表明：阻塞率在0.5~0.7时，障碍物间距对火焰加速效果的影响较大，其中障碍物间距为一倍管径时火焰加速效应最大；而障碍物的空间位置对火焰传播的影响更为显著，当障碍物位于管道单侧时，湍流涡强度最大，火焰褶皱最明显，火焰传播速度最快。Abstract: The effects of blockage ratio, obstacles spacing and obstacles spatial position on the flame acceleration and explosion process of propane-air were studied in this paper.The unsteady combustion process was calculated by using the Reynolds averaged (RANS) equation and turbulent flame closure combustion model. The complex flow field around obstacles and the detailed mechanism of the interaction between the turbulent vortex and the flame surface were analyzed. The results showed that if the vortex zone is short compared to obstacles spacing, one portion of the flame would get in touch with the tube wall and some flame area would be reduced. For the higher blockage ratio, the flame area is the most important factor affecting the flame acceleration and the optimum flame acceleration can be achieved at the obstacles spacing of roughly one tube diameter. In contrast, the obstacles spacing shows little effect on the flame acceleration at lower value of blockage ratio. The flame interacted with vortex steadily during the process of flame propagation result in flame area enhancement that was counteracted by flame area extinction resulting from flame-wall interactions. However, as the blockage ratio increases to a critical value, the vorticity concentration area occupied most of the space between obstacles, therefore, the probability of contact between the flame and the tube wall became very small. In addition, the influence of the spatial position of the obstacles on the flame propagation was more significant. When the obstacles located on both sides of the pipe or in the middle of the pipe, the initial vortex intensity was too small to consume easily and there was no obvious flame folding. The most rapid flame propagation was observed when the obstacles was located on the unilateral side of the pipe, the turbulence vortex intensity in the flow field was the largest, the flame folding was also the most obvious with the process of chemical reaction.
-
图 2 火焰速度的实验值与计算值的对比
Figure 2. Comparison of experimentaland calculated flame velocities
图 4 障碍物空间位置-管道截面图
Figure 4. Schematic diagram of cross section of pipeline and obstacles spatial positions
图 5 不同障碍物间距下的火焰平均加速度
Figure 5. Average flame accelerationunder different obstacles spacing
图 6 阻塞率为0.5时障碍物空间位置对火焰传播的影响
Figure 6. Influence of obstacles spatial position on flame propagation when blocking rate is 0.5
图 9 障碍物不同间距下火焰翻越障碍物时的流场
Figure 9. Flow field when flame crosses obstacles at different obstacle spacings
图 10 火焰翻越不同空间位置障碍物时的流场
Figure 10. Vector velocity field when flame crosses over obstacles at different spatial positions
表 1 湍流模型的计算结果与实验结果的对比
Table 1. Comparison between calculated results of turbulence models and experimental results
方法 pm/MPa δpm/% vm/(m·s-1) δvm/% 实验 0.508 - 194.8 - 可实现k-ε 0.565 0 11.22 182.75 6.59 RNG k-ε 0.412 7 23.09 145.00 34.3 SST k-ω 0.363 7 39.68 150.40 29.52 
下载: 导出CSV
-
[1] CHAPMAN W R, WHEELER R V. Ⅵ.-The propagation of flame in mixtures of methane and air. Part Ⅴ. The movement of the medium in which the flame travels[J]. Journal of the Chemical Society (Resumed), 1927:38-46. [2] DOBASHI R. Experimental study on gas explosion behavior in enclosure[J]. Journal of Loss Prevention in the Progress Industries, 1997, 10(2):83-89. doi: 10.1016/S0950-4230(96)00050-2 [3] MASRI A R, IBRAHIM S S, NEHZAT N, et al. Experimental study of premixed flame propagation over various solid obstructions[J]. Experimental Thermal and Fluid Science, 2000, 21(1):109-116. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=JJ027474262 [4] IBRAHIM S S, MASRI A R. The effects of obstructions on overpressure resulting from premixed flame deflagration[J]. Journal of Loss Prevention in the Process Industries, 2001, 14(3):213-221. doi: 10.1016/S0950-4230(00)00024-3 [5] CICCARELLI G, FOWLER C J, BARDON M. Effect of obstacle size and spacing on the initial stage of flame acceleration in a rough tube[J]. Shock Waves, 2005, 14(3):161-166. doi: 10.1007/s00193-005-0259-4 [6] CATLIN C A, FAIRWEATHER M, IBRAⅡM S S. Predictions of turbulent, premixed flame propagation in explosion tubes[J]. Combustion and Flame, 1995, 102(1):115-128. doi: 10.1016-0010-2180(94)00245-N/ [7] DUNN-RANKIN D, MCCANN M A. Overpressures from nondetonating, baffle-accelerated turbulent flames in tubes[J]. Combustion and Flame, 2000, 120(4):504-514. doi: 10.1016/S0010-2180(99)00109-1 [8] NAAMANSEN P, BARALDI D, HJERTAGER B H, et al. Solution adaptive CFD simulation of premixed flame propagation over various solid obstructions[J]. Journal of Loss Prevention in the Process Industries, 2002, 15(3):189-197. doi: 10.1016/S0950-4230(02)00006-2 [9] GAMEZO V N, OGAWA T, ORAN E S. Numerical simulations of flame propagation and DDT in obstructed channels filled with hydrogen-air mixture[J]. Proceedings of the Combustion Institute, 2007, 31(2):2463-2471. doi: 10.1016/j.proci.2006.07.220 [10] SARLI V D, BENEDETTO A D, RUSSO G. Sub-grid scale combustion models for large eddy simulation of unsteady premixed flame propagation around obstacles[J]. Journal of Hazardous Materials, 2010, 180(1):71-78. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=JJ0222649677 [11] JOHANSEN C, CICCARELLI G. Modeling the initial flame acceleration in an obstructed channel using large eddy simulation[J]. Journal of Loss Prevention in the Process Industries, 2013, 26(4):571-585. doi: 10.1016/j.jlp.2012.12.005 [12] 孙明波, 汪洪波, 梁剑寒.复杂湍流流动的混合RANS/LES方法研究[J].航空计算技术, 2011, 41(1):24-28. doi: 10.3969/j.issn.1671-654X.2011.01.006SUN Mingbo, WANG Hongbo, LIANG Jianhan. Evaluation of hybrid RANS/LES method for complex turbulent flow simulations[J]. Aeronautical Computing Technique, 2011, 41(1):24-28. doi: 10.3969/j.issn.1671-654X.2011.01.006 [13] ZIMONT V L, BATTAGLIA V. Joint RANS/LES approach to premixed flame modeling in the context of the TFC combustion model[J]. Flow, Turbulence and Combustion, 2006, 77(1):305-331. http://www.sciencedirect.com/science/article/pii/B978008044544150087X [14] 陈鹏, 李艳超, 黄福军, 等.方孔障碍物对瓦斯火焰传播影响的实验与大涡模拟[J].爆炸与冲击, 2017, 37(1):21-26. http://www.bzycj.cn/CN/abstract/abstract9681.shtmlCHEN Peng, LI Yanchao, HUANG Fujun, et al. LES approach to premixed methane/air flame propagation in the closed duct with a square-hole obstacle[J]. Explosion and Shock Waves, 2017, 37(1):21-26. http://www.bzycj.cn/CN/abstract/abstract9681.shtml [15] SHEN Xiaobo, HE Xuechao, SUN Jinhua. A comparative study on premixed hydrogen-air and propane-air flame propagations with tulip distortion in a closed duct[J]. Fuel, 2015, 161:248-253. doi: 10.1016/j.fuel.2015.08.043 [16] LV Xianshu, ZHENG Ligang, ZHANG Yugui. Combined effects of obstacle position and equivalence ratio on overpressure of premixed hydrogen-air explosion[J]. International Journal of Hydrogen Energy, 2016, 41(39):17740-17749. doi: 10.1016/j.ijhydene.2016.07.263 [17] 王公忠, 张建华, 李登科, 等.障碍物对预混火焰特性影响的大涡数值模拟[J].爆炸与冲击, 2017, 37(1):68-76. http://www.bzycj.cn/CN/abstract/abstract9687.shtmlWANG Gongzhong, ZHANG Jianhua, LI Dengke, et al. Large eddy simulation of impacted obstacle's effects on premixed flame's characteristics[J]. Explosion and Shock Waves, 2017, 37(1):68-76. http://www.bzycj.cn/CN/abstract/abstract9687.shtml [18] 张欣, 王涛, 侯效森, 等.低热值气体发动机涡团与火焰面相互作用[J].内燃机学报, 2016, 34(6):537-542. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=NRJX201606009&dbname=CJFD&dbcode=CJFQZHANG Xin, WANG Tao, HOU Xiaosen, et al. Flame-vortex interaction of lower heating value gases fueled engine[J]. Transaction of CSICE, 2016, 34(6):537-542. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=NRJX201606009&dbname=CJFD&dbcode=CJFQ [19] JOHANSEN C, CICCARELLI G. Modeling the initial flame acceleration in an obstructed channel using large eddy simulation[J]. Journal of Loss Prevention in the Process Industries, 2013, 26(4):571-585. doi: 10.1016/j.jlp.2012.12.005 期刊类型引用(11)
1. 张佳博，郑龙席，卢杰，彭辰旭，罗振坤. 扇形脉冲爆震燃烧室起爆过程数值模拟. 航空发动机. 2024(03): 53-57 . 
百度学术2. 周振兴，张莉聪，徐景德，姚礼琳，胡洋，李其中，李斯曼. 封闭管道内瓦斯爆炸传播过程中障碍物形状影响效果研究. 华北科技学院学报. 2023(04): 8-16 . 百度学术3. 王皓楠，戚承志，陈昊祥，班力壬，段秋宇，马啸宇，封焱杰，罗伊. 障碍物影响下可燃气体爆炸火焰传播规律的研究进展. 市政技术. 2022(01): 139-147+190 . 百度学术4. 龙凤英，李泽欢，黄俊，俞树威，段玉龙. 多孔材料空间位置对火焰涡激励效应的影响. 安全. 2022(09): 16-23 . 百度学术5. 周宁，戴瑶瑶，陈兵，李雪，赵会军，黄维秋. 变截面管道中气云的燃爆传播研究. 安全与环境学报. 2021(02): 599-606 . 百度学术6. 鲍磊，王鹏，党茜，李厚达，邝辰，于安峰. 石化装置工业尺度管道爆轰传播实验研究. 爆炸与冲击. 2021(09): 145-151 . 
本站查看7. 陈硕，路长，苏振国，孟琪，刘金刚. 煤矿瓦斯爆炸发展规律及防治的综述及展望. 火灾科学. 2021(02): 63-79 . 百度学术8. 贾海林，翟汝鹏，李第辉，项海军，杨永钦. 三种盐类超细水雾抑制管道内甲烷-空气预混气爆炸的差异性. 爆炸与冲击. 2020(08): 42-53 . 本站查看9. 周宁，戴瑶瑶，李雪，宗永迪，陈兵，黄维秋，赵会军，袁雄军. 开口率对置障管道火焰传播特性影响模拟. 高校化学工程学报. 2020(06): 1401-1408 . 百度学术10. 刘俊雄，余建星，陈海成，杨政龙，孔凡冬，雷云. 障碍物排列方式对海洋平台蒸气云爆炸的影响. 中国安全生产科学技术. 2019(08): 5-11 . 百度学术11. 韩永华，季学伟，陈涛，贺丁，吴爱枝，周轶，马克祥. 空间阻塞对室内燃气泄漏爆炸影响研究. 中国安全生产科学技术. 2019(11): 36-42 . 百度学术其他类型引用(13)
-
百度学术
图(10) / 表(1)
计量
- 文章访问数: 5378
- HTML全文浏览量: 1575
- PDF下载量: 102
- 被引次数: 24