带环形隔板的圆柱储箱内液体晃动阻尼分析  

DETERMINATION OF DAMPING RATIO OF THE SMALL-AMPLITUDE LIQUID SLOSHING WITHIN THE CYLINDRICAL CONTAINER WITH A RING BAFFLE

作　　者：杨尊[1] 李俊峰[1] 王天舒[1] 王为[1] 

机构地区：[1]清华大学航天航空学院,北京100084

出　　处：《力学学报》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).~~

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.

关 键 词：晃动 频率 阻尼比 圆环隔板 ALE有限单元法 

分 类 号：O317.2[理学—一般力学与力学基础]