摘要
为探究含尘瓦斯爆炸条件下不同数量障碍物的激励效应,运用中尺度激波管道和激光纹影系统,对比不同数量障碍物影响下含尘瓦斯爆炸的火焰传播和压力变化,分析爆炸流场结构的变化。通过数值模拟软件Fluent模拟含尘瓦斯爆炸,对试验结论进行补充说明。结果表明,障碍物对爆炸火焰的加速作用在单一瓦斯参与下更加强烈。煤尘的加入使得流场湍流度增大,混合爆炸释放更多能量,激波强度增大,爆炸压力提升。障碍物对火焰的影响仅在其附近有效,障碍物下游最大超压明显提升。随障碍物数量的增加,激波反复振荡、叠加,使得压力升高,湍流度增加,火焰形成射流并加速燃烧。火焰传播速度和最大超压与障碍物数量呈正相关关系。
To explore the incentive effect of different numbers of obstacles in the occurrence of a dust-containing gas explosion,this paper uses a mesoscale shock pipe and laser schlieren system to set different numbers of obstacles in the glass window,compare the flame propagation and pressure change of dustcontaining gas explosion under different working conditions,and analyze the influence of the number of obstacles on the incentive effect of dust-containing gas explosion.The numerical simulation software Fluent was used to simulate the dust-containing gas explosion,and the experimental conclusions were supplemented.It is found that the influence of obstacles on dust-containing gas explosion is similar to that on the gas explosion.When obstacles exist,they diffract and reflect shock waves and cause obvious disturbance to flame.However,the acceleration effect of the obstacle on the explosion flame is more intense when a single gas is involved.The addition of coal dust increases the turbulivity of the flow field,releases more energy in the mixed explosion,increases the intensity of the shock wave,increases the explosion pressure as a whole,and the flame appears obvious cell structure.When coal dust and obstacles exist at the same time,multiple chaotic wave systems appear above the obstacles,the flow field is very disordered,and the flame forms a jet,which quickly crosses the obstacles.The influence of the obstacle on the flame is only effective in its vicinity;In the presence of obstacles,the maximum explosion overpressure increases significantly.With the increase in the number of obstacles,the shock wave oscillates repeatedly and is superimposed,which increases the pressure and turbulivity.The area through which the flame passes is reduced,creating a jet that accelerates combustion.Flame velocity and maximum explosion overpressure are positively correlated with the number of obstacles.The study revealed the influence of the number of obstacles on the dustcontaining gas explosion flow field,and further clarified the coupl
作者
徐景德
周振兴
张莉聪
姚礼琳
刘梦杰
李其中
胡洋
XU Jingde;ZHOU Zhenxing;ZHANG Licong;YAO Lilin;LIU Mengjie;LI Qizhong;HU Yang(School of Safety Engineering,North China Institute of Science and Technology,Yanjiao 065201,Hebei,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2024年第1期127-134,共8页
Journal of Safety and Environment
基金
国家自然科学基金项目(51874134)。
关键词
安全工程
瓦斯爆炸
煤尘
障碍物
纹影
数值模拟
safety engineering
gas explosion
coal dust
obstacles
schlieren
numerical simulation
