航天器贮箱内液体晃动阻尼研究(二):数值计算

针对航天器贮箱中燃料晃动阻尼进行估算.在液体晃动阻尼理论研究的基础上,考虑了容器壁面、液体内部以及受污染的自由液面处产生的耗散,建立了一套计算刚性容器中液体小幅晃动阻尼的有限元计算方案,并将计算值与实验值以及经验公式值进行了比较.结果发现大部分情况下的实验值落在两种极端情况的计算值之间,此外如果将液面污染的Stokes边界层阻尼以一定的加权因子引入,可以获得与由实验数据拟合的经验公式一致的结果.

Study on Sloshing Damping in a Container of Spacecraft(Part Ⅱ): Numerical Method

To estimate the damping of fuel sloshing in spacecraft container,A damping computation scheme of liquid sloshing with small amplitude in rigid container using Finite Element Method(FEM) is proposed in the present paper.The scheme takes the dissipation at wall,the interior dissipation and the dissipation at the contaminated free surface into account.After comparing the computation results with experiment results,it is found that most of the experiment results are between the computation results of two extreme conditions.Additionally,if the Stokes boundary layer damping of contaminated free surface is multiplied by a weighting factor,the computation results and experiential formula is consistent.