大攻角流动的非定常特性分析

Analysis of the unsteady character of the flow field at high incidence

本文首先通过动态测量手段研究了大攻角流场中的能量成分,分析了各种成分引发的非定常性对大攻角流动的影响。结果表明大攻角流动本身是一种“涡行为”,非定常性对大攻角流动非对称性的影响较弱,影响大攻角流动的本质因素是涡的动力不稳定性对于前体不确定小扰动的响应。

A study was performed for the energy components in the flow field at high incidence by dynamic measurement. And the effect of the unsteadiness induced by these components on the flow was analyzed at high incidence. The resuits showed that the flow itself at high incidence was a kind of ＂vortex behavior＂ and the effect of the flow unsteadiness on the flow asymmetry at high incidence was feeble. The key factor which can affect the flow at high incidence essentially was the response of the dynamic unsteadiness of the vortexes to the unpredictable micro-disturbance coming from near the nose of the model.