大攻角流动非对称性成因与对策  

On Cause and Research Strategy of Flow Asymmetry in High-Alpha Flows

作　　者：程克明[1] 范召林[2] 尹贵鲁 

机构地区：[1]南京航空航天大学航空宇航学院,南京210016 [2]中国空气动力研究与发展中心高速所,四川绵阳622661 [3]中国贵州航空工业公司飞机设计所,贵州安顺561000

出　　处：《南京航空航天大学学报》2002年第1期17-21,共5页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国防预研基金 (编号 :99J1 3 .1 .3 HK0 2 1 2 );"十五"空气动力学联合攻关课题基金 (编号 :41 3 1 3 0 2 0 1 )资助项目

摘　　要：讨论了大攻角绕流的流动非对称性成因及相应研究对策。指出流动非对称性是绕流系统在适当流动条件下表现出的一种内在属性 (一种分岔行为 )。这一属性本质上是无粘的 ,并不以粘性为先决条件 ,尽管粘性对其有影响。相反 ,粘性方面所表现出的不对称行为很可能是外部无粘绕流非对称性诱导作用的结果。从大攻角绕流表现出的特征来看 ,流动非对称性属绕流系统的分岔、混沌行为 ;对它的进一步探索除了运用流动稳定性分析和实验手段外 。Discussions are made on the cause leading to flow asymmetry in high alpha flows, and corresponding research strategy is proposed. It is indicated that the flow asymmetry is an inherent property(a bifurcation behaviour) of the flow field as a nonlinear dynamic system under appropriate flowing conditions. The flow asymmetry is inviscid in nature. Viscosity is not a necessary pre condition for the onset of the flow asymmetry, although its effects do exist. In contrast, asymmetric behaviours in viscous boundary layers are most probably the consequence of the asymmetric inducing actions of the outer inviscid flow. In view of flow characteristics demonstrated in high alpha flows, the flow asymmetry is actually a bifurcation and chaos phenomenon of the flow field as a nonlinear system. Hence, further exploration to the flow asymmetry must be done by the aid of bifurcation/chaos conceptions and methodology, besides conventional flow stability analysis and experimental approaches.

关 键 词：大攻角 绕流 流动非对称性 分岔 混沌 原因分析 

分 类 号：V211.4[航空宇航科学与技术—航空宇航推进理论与工程]