板式表面张力贮箱推进剂重定位过程数值仿真的网格收敛性分析

Grid convergence analysis for numerical simulation of propellant reposition process in vane-type surface tension tank

为了验证2.67 L卫星贮箱性能,通过建立贮箱仿真模型,分别对贮箱50%与60%填充率下推进剂的重定位过程进行仿真验证。为了提高仿真效率,通过引入GCI指数这一概念,对比295万、625万、767万、955万网格数量的仿真结果,对仿真模型的网格收敛性进行分析。通过两个工况仿真结果的对比验证,认为当网格数量为625万时,数值模拟的误差能够收敛,具有较高的仿真效率。基于该仿真模型,对比分析了贮箱在受到轴向、周向扰动时与不受扰动时推进剂重定位过程的质心坐标变化,发现在扰动持续1 s情况下,推进剂质心变化小于1×10^(-3)m,因此认为该板式贮箱具有较好的抗扰动能力。

In order to verify the performance of 2.67 L satellite tank,a tank simulation model was established.The reposition processes of propellant at 50%and 60%filling rates were simulated.For improving the simulation efficiency,the concept of GCI index was introduced.The simulation results of 2.95 million,6.25 million,7.67 million and 9.55 million grids were compared to analyze the grid convergence of the simulation model.Through the comparison and verification of the simulation results,it was considered that the error of numerical simulation could converge and had high simulation efficiency when the number of grids was 6.25 million.Based on the results,the capability of the tank propellant management device to suppress liquid sloshing was analyzed.And it is shown that the 2.67 L satellite tank has good performance in anti-disturbance capability.