低雷诺数下50°后掠三角翼的旋涡流动

采用数值模拟和流动显示的方法研究了50°后掠角三角翼在低雷诺数下的旋涡流动,结果表明:低雷诺数下,非细长三角翼在5°攻角时就形成了稳定的前缘涡,较小攻角时前缘主涡就开始破裂,并观察到泡型和螺旋型两种旋涡破裂方式。另外,在一定的攻角范围内,前缘主涡的外侧又生成一对新的集中涡,构成双涡结构;随着攻角的增大,前缘涡涡核不断升高,主再附线向中心移动,二次分离区扩大。

Vortex flows over 50° sweep delta wing at low Reynolds number

The computational simulation and experimental investigation have been performed into the vor-tex structure over a non-slender delta wing with leading edge sweep of Λ=50°.The results showed that, at lower Reynolds number, a pair of steady leading edge vortex develops over the wing at 5° angle of attack, and the primary vortex breakdown happens at smaller angle of attack.Moreover,in certain range of angle of at-tack, another pair of concentrated vortex forms outside the primary leading edge vortex, they together com-pose of dual vortex structure, which has been observed both in the experimental and computational studies.As the angle of attack increased, the core of the primary vortex gradually goes away from the wing upper surface, and the primary reattachment lines move towards the center-line of the model.Therefore, the region between the secondary separation line and the secondary attachment line is expanded.