基于流固耦合方法的快速部署浮空器数值研究

Numerical Study of Rapid Deployment Aerostat Based on Fluid-structure Interaction

为了研究快速部署浮空器充气展开过程中的力学机理和工作特性,采用逆向折叠方法建立其折叠态模型,利用任意拉格朗日欧拉方法建立了折叠态气球整个充气过程的数值模型,结构域和流场域基于拉格朗日描述,通过接触算法描述两者间的耦合关系。分析了浮空器在充气展开过程中的外形、应力和流场变化,并将试验结果与数值结果进行对比。仿真结果表明:展开过程与高压氦气源放气特性存在时变非线性耦合,其充气时长、囊体外形时变特性等因素与试验结果基本吻合。且位于底部的蒙皮应力值最高,后续设计和制造过程中需要对底部结构进行增强。通过本文提出的数值方法可以为后续不同任务和构型的快速部署浮空器设计和优化提供参考。

In order to investigate the inflation process and mechanical mechanism of rapid deployment aerostat,a model was fabricated by reverse folding method,and a numerical model for folded balloon inflation was proposed based on arbitrary Lagrange-Euler method,structure and fluid field was described by Lagrange method,while a contact algorithm was introduced to indicate their coupling relationship.The influence of the shape,stress and flow field in the aerostat inflation stage were analyzed,and the results were compared with the experiment.The simulation results shows that there is a time-varying nonlinear coupling in the aerostat inflation stage,the simulated results about the inflation time and time-varying characteristics of the capsule shape agree with the measured data well.Furthermore,the highest stress value of the skin is located at the bottom,which needs to be reinforced during the subsequent design and manufacturing process.The numerical simulation method proposed can provide the reference for the design and optimization of rapid deployment aerostat with different tasks and configurations.