0108 噴流の拡散制御 : 二次フィルム流を用いた噴流制御(OS1-2 噴流,後流および剥離流れの流動解析と応用,オーガナイズドセッション)

概要

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Jets diffusion were controlled by the film flow which was given acoustic excitation. First, the preferred mode frequency of a jet was measured by the hot wire anemometry to investigate the excitation frequency. A change of the potential core was analyzed by visualization and velocity measurement by LDV. For the mainstream, Air, CO_2, and He were used. Momentum ratio of a jet to the air film flow was changed MR=Mf/Mm=0.1〜1.0, and a suitable velocity fluctuation was given to a film flow by the acoustic excitation. Those effects change the average velocity distribution and turbulence on the central axis. These show the detailed relationship of the diffusion effect by the acoustic excitation and suppression effect by the film flow.
2009-11-06