高流速ウォータートンネルによる十字交差二円柱の縦渦励振現象の観察(J13-8 渦励振II,J13 流体関連の騒音と振動)

概要

論文の詳細を見る
A water tunnel is designed and made to enable experiments on longitudinal vortex excitation of a cruciform cylinder system over a Reynolds number range comparable with the wind tunnel experiments carried out so far on this phenomenon. In contrast to the wind tunnel experiment, the downstream cylinder has no suppression effect on the Karman vortex excitation in the water flow. The two types of longitudinal vortex excitation are induced also in water flow. However, oscillation modes other than the cross-flow mode are superimposed due to large excitation force of water flow and low stiffness of the supporting structure. The excitation force coefficient and the conditions of occurrence of the longitudinal vortex excitations expressed by appropriate non-dimensional variables do not agree between the cases of water and air flows, may be due to the differences in the oscillation mode and in the mass ratio.
社団法人日本機械学会の論文
2004-09-04