Chongqing Key Laboratory of Fire and Explosion Safety, Logistical Engineering University, Chongqing 401311, China.
Chongqing Key Laboratory of Fire and Explosion Safety, Logistical Engineering University, Chongqing 401311, China.
J Hazard Mater. 2017 Oct 5;339:131-142. doi: 10.1016/j.jhazmat.2017.06.018. Epub 2017 Jun 15.
In this work, LES simulation coupled with a TFC sub-grid combustion model has been performed in a semi-confined pipe (L/D=10, V=10L) in the presence of four hollow-square obstacles (BR=49.8%) with circular hollow cross-section, in order to study the premixed gasoline-air mixture explosions. The comparisons between simulated results and experimental results have been conducted. It was found that the simulated results were in good agreement with experimental data in terms of flame structures, flame locations and overpressure time histories. Moreover, the interaction between flame propagation process and obstacles, overpressure dynamics were analyzed. In addition, the effects of initial gasoline vapor concentration (lean (ϕ=1.3%), stoichiometric (ϕ=1.7%) and rich (ϕ=2.1%)), and the number of obstacles (from 1 to 4) were also investigated by experiments. Some of the experimental results have been compared with the literature data. It is found that the explosion parameters of gasoline-air mixtures (e.g. the maximum overpressure peaks, average overpressure growth rates, etc.) are different from some other fuels such as hydrogen, methane and LPG, etc.
在这项工作中，在一个半封闭管道（L/D=10，V=10L）中进行了 LES 模拟，并结合了 TFC 亚网格燃烧模型，该管道中存在四个具有圆形中空截面的空心方障碍物（BR=49.8%），以便研究预混汽油-空气混合物爆炸。对模拟结果和实验结果进行了比较。发现模拟结果在火焰结构、火焰位置和超压时程方面与实验数据吻合较好。此外，还分析了火焰传播过程与障碍物之间的相互作用以及超压动力学。此外，还通过实验研究了初始汽油蒸气浓度（贫燃（ϕ=1.3%）、化学计量比（ϕ=1.7%）和富燃（ϕ=2.1%））和障碍物数量（从 1 个到 4 个）的影响。一些实验结果与文献数据进行了比较。结果发现，汽油-空气混合物的爆炸参数（例如最大超压峰值、平均超压增长率等）与其他一些燃料（如氢气、甲烷和液化石油气等）不同。
