抄録
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. It is analyzed the measurement and analysis velocity distributions by hot wire anemometry to examine of controlled jet structure. From the velocity distribution map and a turbulence strength distribution map of a jet, secondary film flow had a rectification effect in a radial direction, and Jet by Acoustically driven had a rectification that there was a diffusion effect in a flow direction. We confirmed the plural modes which coexisted in Jet by spectrum analysis. Jet diffusion is restrained plural vortexes interfere it in the case of VR=0.5, and to disturb growth of a vortex. In the case of VR=1.0, diffusioned increases so that a vortex spreads while two characteristic modes are resonant.
