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采用一种结构化矩形直机翼涡发生器产生一对大小不同、方向相反的翼尖涡,调节双涡涡量的大小比例Γ1/Γ2及其间距b,触发两涡Rayleigh-Ludwieg不稳定性。实验采用流动显示方法定性观察双涡相互作用过程,通过二维PIV(粒子成像测速)系统定量研究双涡相互作用特征,得到双翼尖涡中主涡及次涡的运动特性、环量-时间特性。对不同实验参数下残余环量比例进行分析,发现双涡涡量大小比例Γ1/Γ2在1.3～1.4、b为50mm时双涡相交削弱效果良好,能够实现翼尖涡强度削弱程度达30%～40%。
A structured rectangular straight-wing vortex generator is used to generate a pair of wingtip vortices with different sizes and directions opposite to each other. The size ratio Γ1 / Γ2 and its spacing b of two vortex vanes are adjusted to trigger Rayleigh-Ludwieg instability . In the experiment, the flow display method was used to qualitatively observe the interaction process of double vortex. The two-dimensional PIV (particle imaging velocity measurement) system was used to quantitatively study the characteristics of double-vortex interaction. The motion characteristics of the main vortex and the second vortex in the tip- . The analysis of the proportion of residual ring in different experimental parameters shows that the double vortex volumetric ratio Γ1 / Γ2 is 1.3 ~ 1.4, b is 50mm, the weakening effect of double vortex intersection is good, and the weakening degree of wing tip vortex can reach 30% 40%.