北京航空航天大学学报 ›› 2020, Vol. 46 ›› Issue (6): 1108-1115.doi: 10.13700/j.bh.1001-5965.2019.0408

• 论文 • 上一篇    下一篇

翼伞充气过程的流固耦合方法数值仿真

张思宇1, 余莉1,2, 刘鑫2   

  1. 1. 南京航空航天大学 飞行器环境控制与生命保障工业和信息化部重点实验室, 南京 210016;
    2. 南京航空航天大学 航空学院, 南京 210016
  • 收稿日期:2019-07-23 发布日期:2020-07-02
  • 通讯作者: 余莉 E-mail:yuli_happy@163.com
  • 作者简介:张思宇 男,博士研究生。主要研究方向:流固耦合力学、飞行器安全救生及生命保障;余莉 女,博士,教授,博士生导师。主要研究方向:流固耦合力学、飞行器安全救生及生命保障、人机与环境工程。
  • 基金资助:
    国家自然科学基金(11972192);江苏高校优势学科建设工程

Numerical simulation of parafoil inflation process based on fluid-structure interaction method

ZHANG Siyu1, YU Li1,2, LIU Xin2   

  1. 1. Key Laboratory of Aircraft Environment Control and Life Support, MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2019-07-23 Published:2020-07-02
  • Supported by:
    National Natural Science Foundation of China (11972192); the Priority Academic Program Development of Jiangsu Higher Education Institutions

摘要: 为研究冲压式翼伞折叠充气过程的流固耦合动力学特性,基于自由曲面变形理论建立了多气室冲压翼伞的展向折叠模型。流体域通过时步更新技术实现了随伞载系统运动,采用任意拉格朗日-欧拉(ALE)方法开展了翼伞非定常充气展开过程的非线性动力学数值计算,数值计算结果与空投试验结果具有较好的一致性。深入分析了翼伞充气过程中的三维外形及非定常流场分布情况,表明翼伞充气过程由于翼尖涡绕流,存在“翼尖上翘,中部凹陷”的翼伞尾流再附现象;各气室的充气规律关于中央气室对称;分析了翼伞气动特性的动态变化规律,充满后翼伞滑翔比稳定在2.24。上述研究为翼伞设计及开伞性能预测提供了一定的理论依据。

关键词: 流固耦合, 充气展开, 翼伞, 任意拉格朗日-欧拉(ALE), 尾流再附

Abstract: To study the fluid-structure interaction dynamic characteristics of rammed parafoil during inflating process, a folding model of rammed parafoil with multi-chamber was established based on the theory of free form deformation. The time-step updating technique was used to make fluid field move with the movement of the parafoil system. The nonlinear dynamics numerical calculation was carried out with Arbitrary Lagrange-Euler (ALE) method during the unsteady parafoil inflation process. The numerical results are in good agreement with the airdrop test results. The three-dimensional shape and unsteady flow field distribution indicate that there exists a wake recontact phenomenon with “tip warping and central depression” due to the tip vortex during parafoil inflation process. The inflatable law of each chamber is symmetrical with respect to the central chamber. The dynamic variation law of parafoil aerodynamic characteristics is analyzed and the glide ratio is stable at 2.24 after inflation. The conclusions provide a theoretical basis for parafoil design and inflation performance prediction.

Key words: fluid-structure interaction, inflation, parafoil, Arbitrary Lagrange-Euler (ALE), wake recontact

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