J0504-1-1 一様流中の十字交差二円柱から周期的に流出する縦渦の相似性の検証([J0504-1])流体関連の騒音と振動(1))

概要

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Previous experimental work carried out by the present authors showed that two types of longitudinal vortices shed periodically from a cruciform two-identical-circular-cylinder system in uniform flow. The specific aim of this work is to investigate universality of this phenomenon by carrying out experiments for smaller sizes of cylinders in a high-velocity water tunnel. In addition to the velocity, the alternating lift force loading on the stationary upstream cylinder is measured by using a load-cell. Experimental results show that longitudinal vortices also shed periodically from systems with cylinder diameter of 10 and 15 mm in water flow. Relationships of the Strouhal number and the lift force coefficient for the vortex shedding against Reynolds number agree well with the previous data except a peculiar vanishing of Necklace vortex when Re is larger than 20000.
一般社団法人日本機械学会の論文
2010-09-04