自由振動円柱の付加質量に関する実験的考察(機械力学,計測,自動制御)

概要

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The shell and circular cylinder heat exchanger are widely used for various devices, such as kettle reboilers, feed water heaters, steam generator, evaporator in power generation and so on. In late years, taking measures for an anti-vibration of the heat exchanger, it begins to be important problem to investigate flow induced vibration. The added mass is one of the essential parameters about flow induced vibration. Though the added mass coefficient is same as the displaced mass in the conventional understanding, recent study with the forced oscillation experiments revealed the added mass coefficient varies depending on the reduced velocity V_r. In this study, the added mass coefficients of the circular cylinder oscillation were measured by free oscillation experiments in a water channel. The frequency of circular cylinder oscillation and the flow oscillation around the circular cylinder were measured simultaneously with DynamicPIV, no intrusive to the flow and high spatial and time resolved, measurement techniques. The result showed the added mass coefficient varies depending on the reduced velocity V_r in free oscillation also.
2008-06-25