噴流制御用マイクロフラップ型アクチュエータにより誘起される大規模渦の生成機構(流れの制御(3),一般講演)

概要

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The generation process of vortex rings in a controlled coaxial jet is investigated. The initial stage of their generation is triggered by miniature flap actuators installed in the jet nozzle. They introduce disturbances locally into the outer shear layer. In order to precisely measure the velocity field induced by the flapping motion, a small PIV measurement area at just downstream of the flap is employed. As a result, large negative and positive radial velocities are found associated with the snap back motion of the flap. At a low flapping frequency, two vortex rings are formed by the negative and positive radial velocities. On the other hand, at high flapping frequency, the vortex produced by the positive radial velocity and the next one produced by the following negative radial velocity merge into one vortex ring Therefore, the vortex scale can be flexibly controlled by changing the flapping frequency.
日本流体力学会の論文
2008-09-04