摘要
对均匀来流下由5个圆柱交错布置且两端刚性连接的圆柱系统的涡激振动进行了模拟,采用流固双向耦合数值方法,通过流固耦合求解器同时耦合求解流体模型和结构模型.对流速分别为0.5,0.6和0.7 m/s下,进行不同横向和流向间距比的计算,以分析间距比对由圆柱系统利用涡激振动从低速水流中获取能量及能量密度的影响.计算结果表明:在小间距比下,圆柱后无明显的涡脱落,圆柱系统振幅响应很小;但当间距比较大时,各圆柱后出现频率一致的泻涡,圆柱系统获得较大的振幅响应.获取能量随组合间距比的增大先增长较快,但当流向间距比L/D≥6,横向间距比H/D≥4时,获取能量值趋于稳定;当L/D=6,H/D=4时,能量密度在3个流速下都出现了最大值.因此选择L/D=6,H/D=4为合理的组合间距比,此时圆柱系统可从水流中充分获取能量.文中结论可作为流体机械振动系统的设计参考.
The vortex-induced vibration of five cylinders rigidly linked at both ends with staggered arrangement was simulated under a uniform current. A two-way coupling numerical method was adopted to deal with fluid-structure interaction when the cylinder arrays were subject to a current respectively with 0. 5 m / s,0. 6 m / s and 0. 7 m / s velocities. Further,different streamwise and transverse spacing ratios were applied in simulations to identify their influence on energy harvesting and power density from the current at three stream velocities. The results reveal that there is no obvious vortex shedding and the amplitude of response of cylinder system is very small at low space ratios. However,as the space ratios are high enough,there is vortex shedding from each cylinder at the same frequency and the cylinder system obtains high response amplitude. The energy harvesting is enhanced with increasing spacing ratios,however,it becomes statured once the streamwise spacing ratio L / D≥6 and the transverse spacing ratio H / D≥4. Furthermore,a maximum power density occurs at L / D = 6 and H / D = 4 under the three current velocities. Therefore,L / D = 6 and H / D = 4 should be the reasonable two spacing ratios. This result can be useful for design of cylinder arrays for energy harvesting from water currents.
出处
《排灌机械工程学报》
EI
北大核心
2014年第1期51-55,共5页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51279071)
关键词
圆柱系统
涡激振动
流固双向耦合
间距比
cylinder system
vortex-induced vibration
fluid-structure two-way coupling
spacing ratio
