Effect of nose perturbation on asymmetric vortices over a blunt-nose body at high angle of attack

[摘要] To improve the maneuverability, the modern missiles of blunt-nose slender body configuration are required to flight at high angle of attack where many research show complex asymmetric vortices flow will develop over the slender body. The effect of artificial perturbation located on the nose of a blunt slender body at high angle of attack(α=50°) on asymmetric vortices has been investigated with low speed wind tunnel test. The Reynolds number(ReD) of the experiment was 1.48×105. The experimental results are shown to be the following: Asymmetric flow over blunt-nose body was extremely sensitive to the machining tolerances of the nose and can be governed by the artificial perturbation; with the circumferential angle of artificial perturbation varied a period, asymmetric vortices present a behavior of single-period.

[发布机构] Ministry-of-Education, Key Laboratory of Fluid Mechanics, Beihang University, Beijing; 100191, China^1

[效力级别] 力学 [学科分类] 力学，机械学

[关键词] Artificial perturbations;Asymmetric vortices;Asymmetric vortices flow;Blunt-nose slenderbody;Circumferential angles;Low speed;Low-speed wind tunnel;perturbation