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在水槽中利用激光片光源及荧光素纳染色液显示方法 ,研究了圆柱、机翼与平板交接区及后掠圆柱、后掠机翼变迎角情况下的干扰流场结构、特性及参数影响规律 .实验结果表明 ,除Re数之外 ,模型迎角、后掠角等参数对干扰区马蹄涡特性有很大影响 .研究发现后掠圆柱及后掠机翼在一定条件下存在一类既不同于马蹄涡也不同于卡门涡的空间稳定发展的三维旋涡系即背涡 .背涡在一定的迎角及后掠角条件下发生破裂 ;机翼背涡随迎角变化具有不同于圆柱背涡的特点 .讨论了干扰背涡产生的机制及其与马蹄涡的相互关系 .此外还给出了对于干扰流场典型截面的PIV测量结果 .
The structure of the disturbing flow field, the characteristics and the parameters of the flow field were studied under the conditions of varying the attack angle of the swept wing with the laser light source and fluorescein staining solution in the tank. The experimental results show that except for the Re number, the parameters such as the angle of attack and the sweep angle have a great influence on the characteristics of the horseshoe vortex in the disturbed zone.It is found that under certain conditions there exists a class of both swept cylindrical and swept- Different from the horseshoe vortex, it is also different from the stable three-dimensional vortex system developed in the space of Carmen vortex.The vortex of the vortex ruptures at a certain angle of attack and sweep angle.The wing vortex with different angle of attack The vortex characteristics are discussed, and the mechanism of interferential vortex generation and its relationship with the horseshoe vortex are discussed. In addition, the PIV measurements of the typical cross-section of the interference flow field are given.