Optical Properties of Plane Shear Layers Under Periodic Disturbances

摘要

The optical properties of low-speed shear layers was investigated. This includeda preliminary study of the basic fluid mechanics or shear layers in which the role of coherent eddies was deemed important. A low-speed wind tunnel was used in which parallel flows of different gases could be studied in a shear layer configuration. Additional provisions for movement of a splitter plate were incorporated into the design to affect the mixing process. Measurements have shown that coherent structure does have a profound effect on the optics of the system and that these effects can be markedly changed with forced perturbation of the splitter plate. Numerical analyses of the problem also confirms the potential of optical control of the shear flow.