1422 マイクロ・アクチュエータ群による同軸二重空気噴流の能動制御

概要

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Active mixing control in an coaxial air jet using electromagnetic flap actuators is made and the spatio-temporal flow structures are studied through quantitative flow visualization by PLIF and 2C-PIV. Mixing between the inner and outer fluids is enhanced most effectively by the axisymmetric flapping mode when Strouhal number equals 1. This fact means that the large-scale strong spanwise vortices induced by the flaps are located very closely each other in the shear layer. Those vortices pinch off the central jet continuously, transporting it to the inner and outer shear layers. In addition, presently defined vortex intensity of the large-scale vortical structure is calculated in order to elucidate the roll-up and breakdown processes quantitatively. It is found that the spanwise vortex in the inner shear layer breaks down right downstream o the end of the inner potential core and that the small scale mixing due to streamwise vortices immediately starts to take place. The sequence of these processes enhance the mixing drastically.
一般社団法人日本機械学会の論文
2003-08-05