摘要
通过数值求解抛物化的椭圆型方程生成复杂外形三维网格;采用交替方向隐式分解的隐式NND格式求解全N S方程模拟"类升力体"外形在高超声速下的大迎角流动;采用张涵信发展的流动拓扑结构理论分析给出了"类升力体"外形垂直于体轴的横截面流线随迎角变化的拓扑结构;此外,通过计算发现:大于20°迎角后,在部分横截面背风对称线上出现结构不稳定的鞍点相连现象。
The 3-D grids of complex shape are created by solving parabolic partial differential equations. The hypersonic flows of high angle of attack over liftbody-type are simulated by soving N-S equations with alternating direction implicit NND scheme. The topological structures of hypersonic flowfield based on the sectional flow patterns perpendicular to the body axis are analysed by Zhang hanxin's theory of flow topological structure. Additionally, the unstable-structure phenomenon which is showed by two saddles connection along leeward symmetry line occurs at some sections when the angle of attack great than 20°.
出处
《空气动力学学报》
CSCD
北大核心
2004年第1期80-83,共4页
Acta Aerodynamica Sinica
基金
湖南省自然科学基金(01JJY2008)
国家部委预研项目资助.
