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Transient Dynamic Modeling and Analysis of Complex Parachute Inflation with Fixed Payload

机译：固定有效载荷的复杂降落伞通货膨胀的瞬态动力学建模和分析

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The inflation process of a special parachute with slots and a fixed payload is investigated using a multimaterial arbitrary Lagrangian-Euler-coupled numerical approach, which considers fluid-structure interaction within the LS-DYNA nonlinear analysis code. The transient dynamic solver is set up using a Lagrangian-Euler penalty method, and a numerical simulation of the slot parachute design that considers permeability is performed. The inflation characteristics of a slot parachute at different initial velocities are analyzed. The three-dimensional simulation results for the inflation are validated by comparing with the airdrop test results. Finally, the incompressible fluid dynamics and the evolution of vortexes during the opening process are analyzed. The results demonstrate the following. This slot parachute can rapidly attain a steady state after fully inflating without any obvious canopy breathing. The stress distribution near the slots is obviously higher than the average level across the canopy surface. A symmetrically counterrotated vortex couple appears at the top of the parachute, which then extrudes to asymmetry until the couple separates and is brushed off by the airflow. (C) 2014 American Society of Civil Engineers.
机译：使用多材料任意拉格朗日-欧拉耦合数值方法研究了带有缝隙和固定有效载荷的特殊降落伞的膨胀过程，该方法考虑了LS-DYNA非线性分析代码中的流体-结构相互作用。使用Lagrangian-Euler罚分法设置瞬态动态求解器，并进行考虑了磁导率的缝隙降落伞设计的数值模拟。分析了狭缝降落伞在不同初始速度下的膨胀特性。通过与空投测试结果进行比较，验证了充气的三维模拟结果。最后，分析了打开过程中不可压缩的流体动力学和涡旋的演变。结果证明了以下内容。完全膨胀后，这种开槽降落伞可以迅速达到稳定状态，而没有明显的树冠呼吸。缝隙附近的应力分布明显高于冠层表面的平均应力水平。对称的反向旋转的涡流对出现在降落伞的顶部，然后该涡流对不对称地挤出，直到该对分离并被气流掠过。 （C）2014年美国土木工程师学会。

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  • 来源
    《Journal of aerospace engineering》 |2015年第4期|04014097.1-04014097.15|共15页
  • 作者

    Gao Xinglong; Zhang Qingbin; Tang Qiangang;

  • 作者单位

    Natl Univ Def Technol, Sch Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China;

    Natl Univ Def Technol, Sch Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China;

    Natl Univ Def Technol, Sch Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China;

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