抄録
Active control of jet is applied at control of burner flame or air-conditioning. In this study, secondary film flow is built on the outside of axisymmetric jet. And it is driven by the acoustic excitation for active jet control Furthermore, the velocity ratios of mainstream and film flow and acoustic Strouhal number were changed. The jet structure was visualized by LLS in axial and cross section for research of change in each jet ejecting condition. As a result, it was confirmed that the velocity ratio of film flow influenced to outbreak and growth of vortex ring corresponding with shear stress with surrounding air, and the acoustic excitation influenced to outbreak period of vortex ring in film flow. And it was presumed that there were both modes which rolled up to the mainstream or surrounding air by frequency of an acoustic wave to give. For controlled jet, it was confirmed a mutual interference process of vortex ring and the blade which were base of the vortex structure of jet.
