圆柱体涡激振动海流能捕获效率影响参数分析

Analysis of the parameters influencing the ocean current energy harvesting efficiency of circular cylinder VIV

圆柱体涡激振动发电装置是一种在浅海低流速条件下,利用涡激振动效应高效捕获海流能的设备,为了在不同海况下均能高效地捕获能量,有必要对获能原理和影响获能效率的参数进行分析。结合质量弹簧阻尼振子模型,在时间上对功率积分,建立柱体涡激振动获能效率公式,得到影响效率的参数;通过数值模拟,结合效率公式,对约化速度、阻尼比和质量比进行讨论,发现在约化速度Ur=12.5、阻尼比系数ξsystem=0.081、质量比m*=1.48的条件下,获能效率最大。

The power generator based on vortex induced vibration （VIV） is a device harvesting energy of ocean currents in shallow sea area,even at very low speed.In order to capture energy efficiently in different conditions,it is necessary to analyze the principle efficiency of harvesting energy and effective parameters.The efficiency equation is established with mass-spring-damping oscillator model,through the time integration for power.The effective parameters can be found;through numerical simulation in combination with efficiency equation,it will be discussed with different reduced velocities,different damping ratios and different mass ratios.It shows that when the reduced velocity equals to 12.5,the damping ratio coefficient is 0.081 and the mass ratio is 1.48,the efficiency of harvesting energy is highest.