20307 音響励起と二次フィルム流を用いた噴流制御に関する研究 : 噴流の渦構造について(流れの計測と制御(2),OS6 流れの計測と制御)

概要

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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.
一般社団法人日本機械学会の論文
2006-03-09