大攻角非对称流动的非定常弱扰动控制

Forebody Vortices Control Using a Fast-Swinging Micro-Tip-Strake at High Angles of Attack

研制了一种新的大攻角细长旋成体非对称涡的主动控制技术 ,即在细长旋成体头部施加非定常弱扰动来控制头部非对称背涡。应用七孔探针测量的空间截面流场揭示了非定常控制下非对称涡变成对称涡的流态特征。测力试验研究结果表明该方法不仅能完全消除背涡的非对称性及其产生的侧向力 ,并且有效控制攻角范围从 30°直到 80°。

Effectiveness of the fast-swinging micro-tip-strake technique for controlling forebody vortex asymmetry at high angles of attack has been investigated and developed in low-speed wind tunnel experiments on a slender body of revolution with pointed nose configuration. At high angles of attack (α>25°), the new method is effective in suppressing side force to zero level with only very small energy input, demonstrating that the leverage is available through controlling the vortex flow field at the point of instability. The cross plane flow field on the lee-ward of the forebody is measured by seven hole probe, and the vorticity map and total pressure coefficient contour map reveal the symmetric vortex state under the unsteady micro perturbation control.