摘要
根据现有的阻尼理论,在线性势流的假设下,分别对带刚性和弹性隔板的圆柱形储液箱内液体晃动做了有限元仿真计算．计算结果与实验测定结果相比较发现,在晃动频率上符合得很好,但阻尼比相差较大．同时,通过ALE有限元数值仿真,对储箱内无隔板和有隔板情况下的黏性流体晃动做了比较,初步推定隔板对液体晃动的“滞阻”的一个重要表现形式为涡耗散．
The damping ratio is an important parameter in the fuel sloshing in spacecraft. In this paper, the liquid sloshing in a cylindrical container with rigid and elastic ring baffles are studied by the finite element method, based on the assumption of ideal linear potential flow and using the damping mechanism in literature. Compared with the experiments of NASA, the frequency derived by the finite element method agrees with that of NASA, but with a considerable discrepancy in the damping ratio. Finally, based on a comparison of the flow fields of viscous liquid sloshing in a rectangle tank with a baffle and those without baffle obtained by ALE finite element method, the authors show that the vortex plays an important part in the ＂drag＂ when the baffle is applied in the liquid.
出处
《力学学报》
EI
CSCD
北大核心
2006年第5期660-667,共8页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金资助项目(10302013).~~
关键词
晃动
频率
阻尼比
圆环隔板
ALE有限单元法
sloshing, frequency, damping ratio, baffle, tank, liquid-solid interaction, ALE finite element method
