Detailed schlieren and laser lightsheet visualizations of the near wake of micro vortex generator (MVG) revealed large structures that were different from those of the undisturbed turbulent boundary layer. These structures were attributed to the rapid breakdown of the primary trai領(lǐng) vortex pair. The breakdown was thought to arise from a cylindrical KelvinHelmholtz-like instability surface. The structures appear to be hairpin or ring-like in nature that showed eruptions into the freestream flow, entraining it. 德國(guó)LaVision PIV/PLIF粒子成像測(cè)速場(chǎng)儀