石英砂覆盖下燃气泄漏火灾几何特征分析  

Analysis of geometric characteristics of gas leak fire under different conditions of quartz sand

作　　者：孙晁 燕冰川 陈健 戴联双 高扬 陶常法 SUN Chao;YAN Bingchuan;CHEN Jian;DAI Lianshuang;GAO Yang;TAO Changfa(Pipe China North Pipeline Company Limited,Langfang 065000,China;China Oil&Gas Pipeline Network Corporation,Beijing 100013,China;School of Civil Engineering,Hefei University of Technology,Hefei 230009,China;School of Automotive and Transportation Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]国家管网集团北方管道公司,廊坊065000 [2]国家石油天然气管网集团有限公司,北京100013 [3]合肥工业大学土木与水利工程学院,合肥230009 [4]合肥工业大学汽车与交通工程学院,合肥230009

出　　处：《火灾科学(中英文)》2024年第4期226-232,共7页Fire Safety Science

基　　金：国家管网科技项目(WZXGL202105)。

摘　　要：分析了不同石英砂粒径、不同石英砂层厚度、不同燃气泄漏速度等条件下,火焰高度、火焰根部宽度等火灾动力学参数的演化规律。研究发现,石英砂层覆盖下,火焰燃烧行为分为两种状态,第一种为石英砂颗粒影响下的射流火;第二种为石英砂层影响下的气体池火。通过CFD数值模拟分析,发现石英砂粒径越大,燃气向四周扩散的速度越大,其主要原因是孔隙率增大导致横向沿程阻力减小;石英砂层厚度越大,纵向阻力增大,导致燃气向四周扩散速度增大,上述现象直接影响了火焰行为。实验发现,随着石英砂粒径、石英砂层厚度的增大,火焰根部宽度逐渐增加,火焰高度逐渐降低。最后,通过无量纲分析,建立了火焰根部宽度与砂石直径、砂石厚度和热释放速率之间的耦合关系。The flame height and flame width have been studied under different sand diameters,sand thickness,and leakage velocities.Two states for the fire behaviors have been found,including the jet fire and pool fire.The jet fire will occur when the sand diameter and thickness are low enough,while the pool fire can be found when they are large enough.It is also found that the flame root width increases with the increase of sand diameter,sand thickness,and heat release rate.According to the CFD simulation,it is found that the fuel gas diffusion is much easier in the horizontal direction when the sand diameter and sand thickness increase,respectively.According to the dimensionless analysis,a correlation between the sand diameter,sand thickness,and heat release rate has been developed.

关 键 词：燃气泄漏 火焰高度 火焰根部宽度 石英砂粒径 石英砂厚度 

分 类 号：X932[环境科学与工程—安全科学]