単純なフルイディック発振器の発振周波数について(境界層・せん断流・遷移(2),一般講演)

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 investigate the effects of a kinematic parameter the Reynolds number Re and various geometric parameters upon the jet-oscillation frequency f_D, we conduct experiments in water and in air, by an ultrasonic velocity profiler and a hot-wire anemometer, respectively, at Re<5000. As a result, we reveal the effects of Re and four non-dimensional geometric parameters upon f_D, where f_D is non-dimensionalised as the Strouhal number St. As the four geometric parameters, we consider (1) the streamwise target size, (2) the channel breath, (3) the cross-streamwise target size and (4) the target distance in non-dimensional forms. It is found that the Re effect can be negligible. This guarantees a wide-range workability as flowmeters. All the results can be summarised in an empirical formula describing the relation of St with the four geometric parameters.
日本流体力学会の論文
2010-09-09