Investigation of Horseshoe Vortices in Laminar Boundary Layer
附面层中马蹄形旋涡的实验研究

Smoke visualization and hot-wire technique are used to study horseshoe vortices in laminar boundary layer. It is shown that pairing of horseshoe vortices can induce strong ejection of low-speed field from the wall and entrain high-speed field from the outer region of boundary layer. The linkage of horseshoe vortices with counter-rotating streamwise vortices near the wall and the formation of horseshoe vortice from deformation of sheets of transverse vorticity are also described.