摘要
为了对比不同可燃爆粉尘粒径在基于多孔环形喷嘴的20 L爆炸装置中的分散特征,采用ICEM对计算模型进行局部加密的非结构网格划分,结合耦合时间平均Navier-Stokes控制方程组和DPM动量平衡方程,实现了不同粒径铝粉(50、100、250μm)在20 L爆炸仓中分散全过程的三维数值模拟。结果表明:基于多孔环形喷嘴的20 L爆炸仓内的粉尘云空间分布较为均匀,但粉尘粒径越大,多孔环形喷嘴的约束管道内残留可燃爆粉尘越多,爆炸仓中心位置的真实浓度越低于形式浓度。
To compare the dispersion characteristics of combustible dust with different particle sizes in a 20 L explosion apparatus with a perforated annular nozzle,the ICEM method was used to perform unstructured meshing with local mesh refinement for a computational model,combining with the coupled time-averaged NavierStokes governing equations and DPM momentum balance equation,the three-dimensional numerical simulation of a whole dispersion process of different particle sizes of aluminum powder(50,100 and 250 μm) in a 20 L explosion chamber was realized.The numerical results showed that the spatial distribution of dust cloud in the 20 L explosion chamber based on the perforated annular nozzle is relatively uniform,but the bigger the dust particle size,the more combustible dust remaining in the constrained pipe of the perforated annular nozzle,and the lower the actual concentration of center position of the explosion chamber than normal concentration.
作者
丁建旭
杜群贵
吴雨蒙
陈冬青
王新华
DING Jian-xu;DU Qun-gui;WU Yu-meng;CHEN Dong-qing;WANG Xin-hua(China National Quality Supervision and Testing Center of Explosion-proof Equipment,Guangzhou Academy of Special Equipment Inspecti on &. Testi ng,Guangdong Guangzhou 510760,China;School of Mechanical & Automotive Engineering,SouthChina University of Technology,Guangdong Guangzhou 510006,China;School of Electro Mechanical Engineering,GuangdongUniversity of Technology,Guangdong Guangzhou 510006,China)
出处
《消防科学与技术》
CAS
北大核心
2019年第5期603-606,共4页
Fire Science and Technology
基金
国家重点研发计划项目(2017YFC0804705)
关键词
粒径
分散过程
数值模拟
球形爆炸装置
dust explosion
particle size
dispersion process
numerical simulation
explosion apparatus
