带环形隔板的圆柱储箱内液体晃动阻尼分析

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.

Evaluation of damping ratio of the small-amplitude liquid sloshing within the cylindrical container with a ring baffle

The damping ratio is an important parameter in the research on fuel sloshing of spacecraft. In this paper, the liquid sloshing in the cylindrical container with rigid and elastic ring baffles are emulated by finite element method respectively, based on the hypothesis of ideal linear potential flow and the damping mechanism adopted in recent dissertations. Compared with the experiments of NASA, the frequency derived by the finite element method coincide with that of NASA well, while there is a considerable discrepancy with the damping ratio. Finally, the comparison of the flow fields of viscous liquid sloshing in a rectangle tank with a baffle and those without baffle emulated by ALE finite element method show that one important form of the "drag" that the baffle applying to the liquid is vortex. Key word：sloshing, frequency, damping ratio, baffle, tank, liquid-solid interaction ALE finite element method