多分支管道油气爆炸特性大涡模拟

Large eddy simulation on explosion characteristics of gasoline-air mixture in multi-branch pipeline

为了研究油库常见的分支结构空间内发生油气爆炸时火焰和压力的传播特性,建立了基于WALE湍流模型及Zimont预混火焰模型的油气爆炸模型;模拟了6种不同分支管道结构空间内汽油/空气混合物爆炸发生发展过程;研究了分支管道数量及相对设置位置对爆炸超压的影响规律,以及分支管道对火焰传播形态和速度的影响规律;模拟结果与前人相关实验规律进行对比。研究结果表明:分支管道对汽油/空气混合气预混爆炸具有明显的强化激励作用;火焰锋面传播经过分支管道时,经历规则—褶皱—规则的变化过程;主管道内火焰传播速度,在分支管道对流场的突扩作用和湍流作用的共同影响下呈震荡变化的规律。

In order to study the propagation characteristics of flame and pressure during the gasoline-air mixture explosion occurring in the common space with branch structure of the oil depot, a model of gasoline-air mixture explosion based on the WALE turbulence model and Zimont premixed combustion model was established, and the occurrence and development processes of gasoline-air mixture explosion occurring in the branch pipeline with six types of different structure space were simulated. The influence of the number and relative setting position of branch pipelines on the explosion overpressure as well as the influence of branch pipeline on the shape and velocity of flame propagation were studied, and the simulation results were consistent with the previous relevant experimental rules, which could reflect the development process of gasoline/air mixture explosion better. The results showed that the branch pipeline had obvious strengthening incentive effect on the premixed explosion of gasoline/air mixture. The flame front experienced the variation process of regular-fold-regular when propagating through the branch pipeline. The flame propagation velocity in the main pipeline presented the rule of oscillation change under the combined influence on the sudden expansion effect and turbulence effect of the flow field by the branch pipeline.