无黏流场中结构振动的气动非阻尼现象  

AERODYNAMIC UNDAMPING PHENOMENA OF STRUCTURE OSCILLATING IN INVISCID FLOW^1)

作　　者：刘子强[1] 崔尔杰[1] 白葵[1] 毛国良 

机构地区：[1]北京空气动力研究所,北京100074

出　　处：《力学学报》2003年第1期1-5,共5页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金重点项目(10032060);国际合作项目(中俄合作项目;19982002);国家劳动人事部留学回国人员科研启动资金资助.

摘　　要：研究跨音速飞行航天器的流-固耦合振动非阻尼现象的作用机理.研究表明,流场中的跨音速激波过程是此类非阻尼现象不可忽略的基本原因之一;由于流场对物体振动响应的滞后,形成了周期变化的分布气动力与物体运动之间有规律的相位差异,这种相位差可以引发局部的非阻尼的脉动力作用.这一机制与流场中的黏性过程如边界层和分离流动无关.单纯考虑黏性现象对非阻尼作用影响的认识是有缺陷的.The aerodynamic undamping phenomena and the relevant mechanism are investigated for the aerospace launch vehicle undergoing fluid-structure coupling oscillation in transonic flow. The results obtained show that the distributed periodical aerodynamic force has regular phase difference caused by the time-lag effect between the structure oscillation and the response of the flow field, which can induce local undamping fluctuating aerodynamic forces. This mechanism has no dependence upon the viscous process in the flow field, such as boundary layer and flow separation. It would be incorrect if only the viscous effects are taken into account in determining the undamping phenomena.

关 键 词：无黏流场 结构振动 气动非阻尼现象 跨音速飞行航天器 抖振 

分 类 号：V417.4[航空宇航科学与技术—航空宇航推进理论与工程]