作　　者： ;

机构地区： 广州特种机电设备检测研究院国家防爆设备质量监督检验中心广东广州510760

出　　处： 《消防科学与技术》 2019年第5期603-606,共4页

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.

关 键 词： 粒径 分散过程 数值模拟 球形爆炸装置

领　　域： []