An experimental study on the interaction between a streamwise vortex and compression waves was carried out utilizing nanoparticle-based planar laser scattering techniques. In this study, the attack angles (8° and 12°) of the wing were set to generate streamwise vortices of varying strengths, while curved surfaces were designed to produce compression waves with different adverse pressure gradients. Besides acquiring the flow field of the central streamwise plane, this experiment further captured cross-sectional planes. Instantaneous and time-averaged analyses were performed. Results from the streamwise plane indicate that the compression waves significantly alter the trajectory of the vortex, the vortex core experiences continuous contraction and a gradual reduction in size. Moreover, the increase in intensity of the compression waves results in a more pronounced vortex deflection and a greater reduction in vortex core size. Analysis of the cross sections reveals that after being subjected to compression waves, the cross-sectional shape of the vortex core more closely resembles an ellipse rather than a circle. Furthermore, the wave structures of the interaction region were analyzed, and it was found that an increase in vortex strength markedly alters the distribution of the wave structures. When the vortex and the waves are of sufficient strength, the emergence of transmitted waves is observed. Finally, time-averaged cross-sectional images were processed using binarization and edge extraction techniques. Ellipse fitting was subsequently applied to characterize the morphological evolution of the vortex core. The area of the vortex core at various streamwise locations was further quantitatively extracted.
Ding et al. (Fri,) studied this question.