抄録
In this paper, the vibration phenomena of circular cylinders both for the uniform cross flow and the gap cross flow are compared, making clear the similarities and the difference between both experimentally. The flow-induced vibration experiments were performed by utilizing the same fundamental test apparatus as in the 1st report, and by artificially expanding the flow band width of the cross flow which is exerted on the circular cylinders from the extremely narrow width to the uniform flow width. As a result, it is found that the critical velocity of the vortex shedding vibration and that of fluid elastic vibration become almost constant regardless of the flow band width, when the equivalent velocity is calculated using the continuity condition, and by applying the momentum flux theory on the cross flow jetted from a narrow gap, respectively.
