J091011 円柱のカルマン渦励振および縦渦励振における同期現象と揚力特性([J09101]流体関連の騒音と振動(1))

概要

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Two types of longitudinal vortices, the trailing and the necklace vortex, shed periodically from a cruciform two circular cylinder system in a uniform flow for respective ranges of the gap-to-diameter ratio s/d. They induce cross-flow vibrations (TVIV and NVIV) on the upstream cylinder accompanied by the vortex-synchronization (lock-in) over considerably wider ranges of reduced velocity as compared with the well-known Karman-vortex induced vibration (KVIV). In this study, fluctuating lift loading on a mechanically oscillated circular cylinder is measured in a water tunnel with setting a cruciform counterpart at s/d=0.08 and 0.3 corresponding to TVIV and NVIV, together with the case of isolated cylinder. The condition for the synchronization is determined from simultaneous measurement of the velocity and the lift. The relationship between the lift generated by the synchronizing vortices and the cylinder oscillation are obtained for the three vortices. The large difference in the behaviors of the three VIVs are attributed to different characteristics of the lift generated by the synchronizing vortices.
一般社団法人日本機械学会の論文
2011-09-11