S0502-2-4 数値計算による円形シンセティック・ジェットの流動構造の検討([S0502-2]噴流,後流および剥離流れ現象の解明と制御(2))

概要

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Structures of circular synthetic jets were investigated numerically by using 3D Large-Eddy-Simulation. The instantaneous velocity vectors and vorticity contours were obtained for 3 different strokes of alternating flow in an orifice with nearly the same Reynolds numbers. The simulation results indicate that an array of vortex rings is formed near the orifice and the spacing of vortex rings increases as the stroke is increased. As the vortex travels downward from the orifice, the vortex spacing increases at first and then decreases gradually to the scale of the orifice diameter where the vortex is observed to break down. The location of the vortex collapse is shifted to downward as the stroke is increased. This change of vortex collapse allows us to explain the change in the starting point of the jet growth which was observed in previous experiments.
一般社団法人日本機械学会の論文
2010-09-04