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波阵风中的弹性飞机动力学建模与仿真

王立波1,荆志伟2,唐矗3   

  1. 1. 中航工业第一飞机设计研究院
    2. 航空工业第一飞机设计研究院
    3. 西北工业大学
  • 收稿日期:2022-11-02 修回日期:2023-01-16 出版日期:2023-02-06 发布日期:2023-02-06
  • 通讯作者: 唐矗

Modelling and simulation for the flexible aircraft in the blast wind

Li-Bo WANGZhi-Wei JING2,   

  • Received:2022-11-02 Revised:2023-01-16 Online:2023-02-06 Published:2023-02-06

摘要: 爆炸产生的波阵风以超音速或音速传播,且携带了高能扰动能量,它会对飞机产生显著的扰动作用甚至破坏作用。阐述了爆炸波阵风的模型,定义了波阵风与飞机的作用方法。将波阵风对飞机的作用折算为下洗效应,采用亚音速偶极子格网法,推导了波阵风对飞机的非定常激励力计算公式,基于此建立了波阵风中的弹性飞机动力学模型,提出了波阵风中的弹性飞机动响应仿真流程。数值仿真结果表明:波阵风激励力计算方法有效,能满足工程实践需求;在质心处,弹性飞机与刚体飞机的动响应结果相似、差异不大;在翼尖区域,由于气动弹性效应,弹性飞机与刚体飞机的动响应结果有显著差别;波阵风的激励能量主要集中于1Hz以下,在构建弹性飞机动力学模型时可以忽略振动频率比较高的弹性模态。

关键词: 波阵风, 弹性飞机, 非定常气动力, 有理函数拟合, 动响应

Abstract: The blast wind generated by the explosion propagates at supersonic or sonic speeds and carries high-energy disturbance energy, which can have a significant disturbance or even destructive effect on the aircraft. The model of the blast wind is described, and the method of action between the blast wind and the aircraft is defined. The effect of blast wind on aircraft was treated as the downwash effect, and the unsteady excitation force calculation formula for aircraft in the blast wind was derived by employing the subsonic doublet lattice method, based on which the dynamics model of elastic aircraft in the blast wind was established, and the dynamic response simulation process for flexible aircraft in the blast wind was proposed. The numerical simulation results show that the calculation method of the excitation force due to the blast wind is effective and can meet the requirements of engineering practice. At the center of gravity, the dynamic response results of elastic aircraft and rigid aircraft are similar and have no obvious difference. In the wingtip region, the dynamic response results of elastic aircraft and rigid body aircraft show significant difference due to the aeroelastic effect. Since the excitation energy of the blast wind is mainly concentrated below 1Hz, the elastic modes with relatively high vibration frequencies can be ignored when establishing dynamics models of the elastic aircraft.

Key words: blast wind, flexible aircraft, unsteady aerodynamics, rational aerodynamic approximation, dynamic response

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