On vortex generating jets (original) (raw)
2000, International Journal of Heat and Fluid Flow
Vortex generating jets (VGJs) are jets that pass through a wall and into a cross¯ow to create a dominant streamwise vortex that remains embedded in the boundary layer over the wall. The VGJ is characterized by its pitch and skew angles (U and H) and the velocity ratio (VR) between the jet and the cross¯ow. For VR 1.0, the VGJ con®guration of U 30°Y H 60°has been identi®ed as that which produces the vortex with the highest peak mean vorticity. Three-component laser Doppler velocimetry (LDV) data for this particular con®guration demonstrate many interesting features of the¯ow. Mean velocity data show a de®cit of streamwise momentum in the core of the vortex, thinning of the boundary layer on the downwash side of the vortex, and thickening of the boundary layer on the upwash side. Plots of the turbulent kinetic energy and the turbulent shear stress huvi show that the turbulent structure of the boundary layer is grossly disturbed by the presence of the vortex. The turbulent transport of the turbulent kinetic energy shows the possibility for a gradient diusion model in most regions, but not the vortex core. Ó
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