Control of a Self-Preserving Wall Jet by an Embedded Streamwise Vortex (Mean Flow Properties and Evolution of a Streamwise Votex)

摘要

The effect of a streamwise vortex on the development of a wall jet has been investigated experimentally. A streamwise vortex created with a half delta wing mounted on the wall, which has the same height as inner-layer thickness, is introduced into a self-preserving wall jet. The mean flow field and its deformation due to secondary flow induced by the vortex are reported in detail. Evolution of the streamwise vortex itself, decay of vorticity, and path and growth of vortex radius are measured and compared with corresponding results obtained in turbulent boundary layers.