波阵风中的弹性飞机动力学建模与仿真  

Modelling and simulation of flexible aircraft in blast wind

作　　者：王立波 荆志伟 唐矗 WANG Libo;JING Zhiwei;TANG Chu(The First Aircraft Institute,Aviation Industry Corporation of China,Ltd.,Xi’an 710089,China;Unmanned System Research Institute,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]航空工业第一飞机设计研究院,西安710089 [2]西北工业大学无人系统技术研究院,西安710072

出　　处：《航空学报》2023年第17期182-196,共15页Acta Aeronautica et Astronautica Sinica

摘　　要：爆炸产生的波阵风以超声速或声速传播,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。本文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,采用亚声速偶极子格网法,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1 Hz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。The blast wind generated by the explosion propagates at supersonic or sonic speed and carries high-energy disturbance energy,and 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 is treated as the downwash effect,and the unsteady excitation force calculation formula for aircraft in the blast wind is derived by employing the subsonic doublet lattice method.A dynamics model of elastic aircraft in the blast wind is established,and the dynamic response simulation process for flexible aircraft in the blast wind is 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 re⁃sponse results of elastic aircraft and rigid aircraft have no obvious difference.In the wingtip region,the dynamic re⁃sponse 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 1 Hz,the elastic modes with relatively high vibra⁃tion frequencies can be ignored in establishing dynamics model of the elastic aircraft.

关 键 词：波阵风 弹性飞机 非定常气动力 气动弹性 动响应 

分 类 号：V215.3[航空宇航科学与技术—航空宇航推进理论与工程]