弹性载机对外挂物动力学响应的影响  

Influence of Elastic Carrier to Dynamic Responses of Store

作　　者：杨磊[1] 叶正寅[1] 武洁[1] 

机构地区：[1]西北工业大学航空学院翼型叶栅空气动力学国防科技重点实验室,陕西西安710072

出　　处：《气体物理》2016年第4期1-11,共11页Physics of Gases

基　　金：国家自然科学基金(11272264)

摘　　要：在外挂物投放过程中,载机对外挂物具有气动干扰效应,产生附加气动力.对于弹性机翼,在外挂物分离投放时,相当于给机翼一个初始扰动,机翼将发生弹性振动,该振动也会对外挂物带来气动干扰效应.通过耦合求解非定常N-S方程刚体六自由度方程和基于模态法的结构动力学方程,对考虑弹性变形的载机外挂物分离投放过程进行模拟,研究了弹性机翼对外挂物的气动干扰效应.研究结果表明:在外挂物分离初期,弹性机翼的干扰对外挂物气动力响应产生显著影响,机翼的主要结构模态频率决定了外挂物气动力的变化频率,并且由载机机翼动弹性变形引起的干扰气动力能占到外挂物总气动力的一半左右.The separation between the aircraft and store is one of the most important and difficult phases in air-launch-to-orbittechnology. There exists strong aerodynamic interference between the aircraft and the store in store separation. When theaspect ratio of the aircraft is large, the elastic deformations of the wing must be considered. The main purpose of this articleis to study the influence of the interference aerodynamics caused by the elastic deformations of the wing to the unsteady aerodynamicsof the store. By solving the coupled functions of unsteady Navier-Stokes equations, six degrees of freedom dynamicequations and structural dynamic equations simultaneously, the store separation with the elastic deformation of theaircraft considered was simulated numerically. The interactive aerodynamic forces were analyzed. The study shows that theinterference aerodynamics is obvious at earlier time during the separation, and the dominant frequency of the elastic wingdetermines the aerodynamic forces frequencies of the store. Besides, when the relative distance between the carrier and storeis small, the interference aerodynamic forces caused by the elastic vibration of the carrier is about half of the total aerodynamicforces of the store.

关 键 词：外挂物分离 干扰气动力 弹性变形 动力学响应 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]