大攻角流动非对称性成因与对策

讨论了大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，必须借助分岔混沌思想和方法。

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

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.