立式柱形钢储罐内部爆炸数值模拟及动力响应分析  

Numerical Simulation of Internal Explosion and Dynamic Response Analysis for Vertical Cylindrical Steel Tanks

作　　者：庞崇安[1] 王震[2] 

机构地区：[1]浙江同济科技职业学院,杭州311231 [2]浙江省建筑设计研究院,杭州310006

出　　处：《爆破》2015年第2期54-58,共5页Blasting

基　　金：2013年度浙江省住房和城乡建设厅建设科研和推广项目(浙财建[2013]357号);2014年度浙江省水利厅科技计划项目(RC1402)

摘　　要：针对立式柱形钢储罐内部蒸气云爆炸,采用TNT当量模型进行数值模拟。首先采用非耦合方法（刚性壁面）研究立式柱形储罐内部爆炸流场演变情况,获得罐壁附近超压时程变化;接着采用耦合方法（变形壁面）研究不同壁厚时罐壁附近超压时程变化,考察爆炸流场与罐壁变形之间耦合效应的影响,同时获得储罐变形和von Mises应力分布的动力响应情况。研究表明：除顶盖中心区域外,可将第1个反射超压作为储罐内壁面爆炸冲击荷载,顶盖中心区域建议考虑到后续2~3个波形;除顶盖中心区域外,耦合效应对内部爆炸冲击荷载的影响不大;罐壁-顶盖、罐壁-底板连接和顶盖中心区域是动力响应中的变形和应力薄弱位置,实际结构设计中需进行加强。For the internal vapor cloud explosion of vertical cylindrical steel tank, the TNT equivalent model was applied to numerically simulate the explosions. Firstly, by using non-coupling method （rigid wall）, the internal explo- sion loading evolution of vertical cylindrical tanks and overpressure time changes were obtained near tank wall. Then, by employing coupling method （deformed wall）, the overpressure time change with different wall thickness was stud- ied, and the effects of fluid-structure interaction between the explosion flow field and the tank wall deformation was then examined. Meanwhile, the tank dynamic response including deformation and Von Mises stress distribution were obtained as well. It was shown that except the top center area of the flat-reof,the first reflected overpressure could be adopted as explosion loading of internal tank wall;while at the center of the flat-roof, the subsequent 2 to 3 waves should be considered. Except the center of flat-roof, the effect of fluid-structure interaction made little influence on internal explosion loading. The connector between tank wall and roof, tank wall and base plate, and the center area of roof were weak, therefore, the dynamic response including deformation and stress should be strengthened in actual structural design.

关 键 词：钢储罐 爆炸荷载 TNT当量 耦合效应 超压峰值 动力响应 

分 类 号：O381[理学—流体力学]