细长尖头旋成体大迎角非对称涡系结构

本文采用数值计算方法,对细长尖拱旋成体大迎角背风侧非对称涡系结构以及与沿轴向交变的侧向力分布的关系进行了研究.求解的是N-S方程,采用Jameson中心格式,湍流采用修正的B-L模型.通过数值模拟揭示了在头部开始产生非对称涡,形成二次涡的机理以及在背风侧形成集中涡的过程.从而说明了采用集中涡来模拟这类流场的正确性,表明了二次涡对多个脱体集中涡形成的贡献.

Asymmetric vortex structure of slender revolution at high angles of attack

This paper presents the asymmetric vortex characteristics and the alternate side force along axis on the leeward of the slender revolution at high angle of attack. The numerical simulation sloves Navier-Stokes equations, uses jame- son's center scheme and modified B-L turbulence model. It is believed that the asymmetric vortex generates at the nose of a revolution. It is believed that the discrete vortex system model is made up of a pair of primary vortices coming from the apex and lateral vortices rolled up along both sides of the body and this vortex system model is reasonable through the numerical simulated result.