排灌机械工程学报
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排灌机械工程学报  2014, Vol. 32 Issue (1): 51-55    DOI: 10.3969/j.issn.1674-8530.13.0108
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间距比对圆柱系统从水流中获取能量的影响
罗竹梅1, 张立翔2
1.昆明理工大学冶金与能源工程学院, 云南 昆明 650093; 2.昆明理工大学土木工程学院, 云南 昆明 650051
Influence of spacing ratio on energy harvesting from water current by cylinder arrays
Luo Zhumei1, Zhang Lixiang2
1.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; 2.Faculty of Civil Engineering and Architecture, Kunming University of Science and Technology, Kunming, Yunnan 650051, China
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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;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.
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罗竹梅
张立翔
关键词圆柱系统   涡激振动   流固双向耦合   间距比     
Abstract: 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 spa-cing 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.
Key wordscylinder system   vortex-induced vibration   fluid-structure two-way coupling   spacing ratio   
收稿日期: 2013-03-11;
基金资助:

国家自然科学基金资助项目(51279071)

通讯作者: 罗竹梅(1979—),女,四川大竹人,讲师,博士研究生(meizl7879@163.com),主要从事流固耦合研究.   
作者简介: 张立翔(1959—),男,云南石屏人,教授,博士生导师(zlxzcc@126.com),主要从事流固耦合及振动研究.
引用本文:   
罗竹梅,张立翔. 间距比对圆柱系统从水流中获取能量的影响[J]. 排灌机械工程学报, 2014, 32(1): 51-55.
LUO Zhu-Mei-,ZHANG Li-Xiang-. Influence of spacing ratio on energy harvesting from water current by cylinder arrays[J]. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(1): 51-55.
 
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