S0502-1-4 せん断層励起した長方形噴流中の渦構造([S0502-1]噴流,後流および剥離流れ現象の解明と制御(1))

概要

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Active control of a rectangular jet has been attempted to manipulate the vortex shedding interval in the major shear layer. It is considered essential that the vortex distribution along the each major shear layers plays an important role to characterize a rectangular jet behavior. In the present investigation, it was remarkably observed that the jet spreads more widely in the minor direction and contracts more greatly in major direction by the asymmetric excitation than that of the non-excited jet. Hot wire measurement was conducted, and could provide the mean, coherent and random velocity components from the instantaneous velocity signal. The measurement results showed that the coherent vortices are generated in synchronization with the excitation frequency and the pattern. In addition, it was revealed that the inclined vortex rings are formed and interacted with each other only when the jet was excited by asymmetric mode. The jet spreading is attributed to the tilting alignment of the vortex ring, and the jet contracting in minor direction is due to the self-induced deformation of the rectangular vortex ring.
一般社団法人日本機械学会の論文
2010-09-04