用粒子图像测速法研究边条涡的性质

An Experimental Investigation on Properties of Strake Vortices Using Particle Image Velocimetry

在风洞中应用粒子图像测速法对边条机翼模型产生的边条涡的各种特性进行了实验研究。实验主要测量了各种攻角下边条后缘、基本翼的 1 2平均气动弦、立尾前缘及立尾后缘四个位置与机身轴线垂直的截面内的流场 ,同时利用二维谱分析的方法对测得的二维速度场进行分析得出边条涡的能量谱。实验结果表明边条涡强度随攻角呈平方关系增长 ,边条涡的破碎形态为单螺旋破碎。

An experimental investigation on the properties of vortices generated by the strake-wing has been carried out in the wind tunnel using Particle Image Velocimetry (PIV). Measurements of flowfield in the cross-sections vertical to the axes of the model have been made with various attack-angles at the trailing edge of the strake,the 1/2 mean aerodynamics chord of the basic wing and also the leading and trailing edges of the vertical tail.Two-dimensional spectrum analysis has been used to calculate the energy spectra of the flowfield with the strake vortices in the wavenumber space.Results indicate that the strength of the strake vortex increases with a quadric function of the attack angle and the type of vortex breakdown is spiral breakdown in this experiment.