北京航空航天大学学报 ›› 2021, Vol. 47 ›› Issue (5): 1025-1037.doi: 10.13700/j.bh.1001-5965.2020.0556

• 论文 • 上一篇    下一篇

飞机波浪水面迫降过程中极限冲击载荷数值研究

赵芸可, 刘沛清   

  1. 北京航空航天大学 航空科学与工程学院, 北京 100083
  • 收稿日期:2020-09-25 发布日期:2021-05-28
  • 通讯作者: 刘沛清 E-mail:lpq@buaa.edu.cn
  • 作者简介:赵芸可,女,博士研究生。主要研究方向:流体力学;刘沛清,男,博士,教授,博士生导师。主要研究方向:流动分离与控制、大迎角空气动力学、飞行器气动布局等。

Numerical study on maximum impact load during aircraft ditching on wave surface

ZHAO Yunke, LIU Peiqing   

  1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China
  • Received:2020-09-25 Published:2021-05-28

摘要: 针对飞机在波浪水面迫降过程中机身所受的极限冲击载荷大小及其物理成因问题,采用数值模拟方法展开研究,结合有限体积法和流体体积(VOF)法捕捉自由面,采用六自由度(6DOF)模型和整体运动网格(GMM)处理水面与飞机之间的相对运动,模拟飞机的迫降过程。通过选择飞机相对水面下沉速度最大的波面相位作为迫降触水位置,预报机身所受的极限冲击载荷大小。结果表明:在波浪水面迫降的触水阶段中,机身遭遇了平静水面未预见的冲击峰,同时冲击峰值大小与飞机相对水面的下沉速度有关。此外,对比了在5种不同波高海况下飞机迫降的运动姿态和过载变化历程,给出了波高对极限冲击载荷和其余各参数峰值的影响规律,为飞机载荷分布设计提供参考依据。

关键词: 水上迫降, 波浪水面, 冲击载荷, 计算流体力学, 流体体积(VOF)

Abstract: This paper uses numerical methods to study the magnitude of the maximum impact load on the fuselage and its physical cause during the compulsory landing of the wave. In the numerical calculation, the finite volume method and Volume of Fluid (VOF) method are used to capture the free surface. The Six-Degree-of-Freedom (6DOF) model and the Global Motion Mesh (GMM) are used to process the relative motion between water and the aircraft, and simulate the forced landing process of the aircraft. By selecting the wavefront phase of the aircraft that has the maximum sinking speed relative to the water surface as the position of the forced landing water contact, the ultimate impact load on the fuselage is predicted. The results show that during the water-impacting stage of the wavy surface, the fuselage encounters an unforeseen impact peak on a calm water surface, and the magnitude of the impact peak is related to the sinking speed of the aircraft relative to the water surface. This paper also compares the movement attitude and overload change history of aircraft forced landing under five different wave height sea conditions, and gives the influence rules of wave height on the maximum impact load and the peak values of other parameters, which provides a reference for the design of aircraft load distribution.

Key words: aircraft ditching, wave surface, impact load, computational fluid dynamics, Volume of Fluid (VOF)

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