影响从涡激振动中获取能量的参数研究

摘要

涡激振动是一种常见的流固耦合现象，当结构物振幅较大时，可利用涡激振动从海洋流中或河流中获取能量。通过流固充分耦合数值方法，对二维弹性支撑圆柱体在均匀流中的横向涡激振动进行了模拟。用该数值方法对4种方案进行计算，分析质量比m*、阻尼比ζ、质量阻尼比m*ζ和固有频率fn对圆柱体从涡激振动中获取能量效率η的影响。结果发现m*、ζ、m*ζ和fn都会影响η，且存在一个最优的m*ζ值，使能量获取效率η最大。对基于这一想法的振动系统的设计，其结论可作为参考。%A vortex-induced vibration is a kind of common phenomenon of fluid-structure interaction.When vibration of a structure in ocean or river currents is substantial,it can be used to extract energy from ocean or river currents.A numerical method with fully coupling between fluid and structure was presented to simulate the vortex-induced vibration of a spring-mounted cylinder in uniform currents.In order to analyze the influence of mass ratio m*,damping ratio ζ,mass-damping ratio m*ζand natural frequency fn on the energy extraction efficiencyη,four groups of cases were computed.The resulted revealed that ηis influenced by the above parameters and there is an optimal value of m*ζto make ηbe the maximum.The conclusions provided a reference for design of vibration systems based on the above idea.