利用DES方法对大迎角细长旋成体气动特性受俯仰振荡影响的数值研究

Numerical study of pitching oscillation effect on aerodynamic characteristics over a slender body using DES

采用DES(Detached-Eddy Simulation)对大攻角下细长旋成体俯仰振动的气动特性进行了数值模拟,分析俯仰振动对细长旋成体流场与气动力特性的影响。通过对背风面分离涡的强度和位置,流场形态,截面压强系数和侧向力系数的观察与分析,发现施加小振幅、特定频率的俯仰振动对大迎角细长旋成体背风面流场有明显的控制能力,将改变流场结构,使背风面非对称流场趋于对称。

RANS/LES hybrid methods based on S-A model is presented here to simulate the separated flow of the slender under the influence of pitching oscillation at high angle of attack.The location and strength of separated vortex,flow field and pressure distribution on the surface were observed and analyzed.It is found that,the pitching oscillation at fixed frequency has strong control ability to the slender body at high angles of attack,and it would change the construction of flow field,the asymmetrical flow was restrained and tends to symmetrical flow.