布置方式对圆柱系统从涡激振动中获取能量的影响

Influence of arrangement on harvesting energy for cylinder system from vortex-induced vibration

通过流固双向耦合数值方法,对刚性连接矩形布置的4圆柱系统和交错布置的5圆柱系统在均匀来流中的涡激振动进行了模拟。设计了不同的流向间距比L/D和横向间距比H/D方案,以分析矩形布置和交错布置对圆柱系统从海洋流或河流中利用涡激振动获取能量及能量密度的影响。结果表明当组合间距比LH/D2增加到一定值时,两种布置的圆柱系统其振幅响应和获取能量值趋于稳定。4圆柱系统在L/D=2.5和H/D=2,5圆柱系统在L/D=6和H/D=4时,三个约化速度下能量密度同时出现最大值。根据各组合间距比下振幅响应、获取能量及能量密度的结果发现,若要从水流中获取到更多的水动能,多圆柱系统其布置方式采用交错布置优于矩形布置。

A numerical method using two-way coupling between fluid and structure was presented for simulating the vortex-induced vibration of four cylinders with rectangular arrangement and five cylinders with staggered arrangement in uniform currents. Different spacing ratios L/D in flow direction and space ratio H/D in transverse direction was designed to analyze the influence of rectangular arrangement and staggered arrangement on harvesting energy and power density from currents making advantage of vortex-induced vibration. The results reveal that harvesting energy and amplitude response tend to be stable when combination spacing ratio LH/D2 increased to a certain value. At three different reduced speeds, power density reaches a maximum value when four cylinder system at L/D=2.5, H/D=2 and five cylinder system at L/D=6, H/D=4. According to the results of amplitude response, harvesting energy and power density in different combination space ratio, if more energy is extracted from water currents, the staggered arrangement is better than the rectangular arrangement for a multi-cylinder system.