S054081 フリップフロップ・ジェット・ノズルのターゲット長さの影響([S05408]噴流,後流,およびはく離流れの基礎と応用:最前線(8))

概要

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In the present study, we investigate a self-excited oscillatory phenomenon of a two-dimensional confined jet with a rectangular-cross-section cylinder as a downstream target. More specifically, in order to reveal the effects of a streamwise size a of the downstream target upon both the occurrence condition for stable jet's oscillation and the jet-oscillation frequency fp, we conduct experiments at Re = 500 in water by an ultrasonic velocity profiler. As a result, we find that the effect the non-dimensional streamwise target size a/b upon the occurrence condition is negligible at alb > 10, where b denotes a length scale of the jet's breadth At alb > 10, we cannot ignore the a/b effect, namely, the jet's oscillation tends to suppress. However, if we can detectfp,fp can be predicted welly by the proposed empirical formula describing the relation of St with the four geometric parameters.
一般社団法人日本機械学会の論文
2011-09-11