大迎角细长体绕流背涡结构与气动特性分析

结合实验成果，对大迎角细长体绕流结构及其气动特征进行了分析。利用势流理论，探讨了大迎角下非对称侧向力沿物体轴线的变化特征与分离背涡结构之间的关系，得出截面侧向力系数沿轴向呈现正弦型曲线的变化特征是由轴向旋涡不断脱落所形成的多涡系统诱导的结果。对于三涡以上的多涡系统中，对称的物面压强分布并非一定对应对称的涡结构。

LEE-SIDE VORTEX STRUCTURE AND AERODYNAMIC CHARACTERISTICS ANALYSIS OVER A SLENDER CYLINDER AT HIGH INCIDENCE

Lee-side vortex structure and aerodynamic characteristics of a slender cylinder at high incidence are analyzed. According to the potential flow theory, the relationship between the asymmetry side-force along axial direction and lee-side vortex structure is explored. Three important viewpoints are drawn: (1) The symmetry vortex cores are maintained along axial direction until the location at x0-1.55R, y0=0.51R; (2) for multi-vortices system more than three point-vortices, the sectional pressure distribution is symmetric, but the sectional vortex structure is not always symmetric; (3) The sinusoid variety of sectional side-force coefficent is produced by the induction of multi-vortices system which is formed through the vortices shedding along axial direction.