十字交差円柱・平板系で形成される縦渦を駆動力とした円柱のギャロッピング現象

抄録

Galloping is induced on a circular cylinder driven by a necklace vortex generated in the gap between the cylinder and a wake plate. The lift force caused by the necklace vortex is evaluated by a rotary circular cylinder turbine with a wake ring plate system to predict the condition of the galloping based on the quasi-stationary theory of galloping. The rotational oscillation system of the circular cylinder blade with an arc-shaped wake plate is designed to induce the galloping of circular cylinder. From the experiments, the large amplitude of the oscillation was induced and we confirmed that it was different from the longitudinal vortex-induced vibration.