Analysis of force characteristics and hydrokinetic energy harvesting of four coupling-linked cylinders from vortex-induced vibrations
LUO Zhu-mei1,ZHANG Li-xiang2
1.Department of Energy and Power Engineering,Kunming University of Science and Technology,Kunming 650093,China;
2.Department of Engineering Mechanics,Kunming University of Science and Technology,Kunming 650051,China
Vortex-induced vibration is a common phenomenon of fluid-structure interaction. When the vibration of structure is substantial, it can be used to extract energy from ocean or river currents. A numerical method using two-way coupling between fluid and structure was presented for simulating the vortex-induced vibration of four coupling-linked and spring-mounted cylinders in uniform currents. Different stream-wise and transverse spacing ratios were applied in simulation to identify their influence on not only lift and pressure characteristics but also energy harvesting and power density. The results reveal that the mean lift force coefficients CL of upper two cylinders are symmetrical about CL=0 with that the lower two cylinders and the amplitude of pressure coefficients are also symmetrical about θ=180o between them under various combinational spacing ratio while the root mean lift force coefficient of the upper two cylinders is approximately equal to that the lower two cylinders. The energy harvesting and power density are enhanced with increasing spacing ratios first, then the energy harvesting increases slowly while the power density is reduced. So reasonable stream-wise and transverse spacing ratios should be adopted to extracting more hydrokinetic energy from water currents.
罗竹梅1, 张立翔2. 耦合四圆柱涡激振动的力特性及水动能获取分析[J]. 振动与冲击, 2015, 34(17): 25-29.
LUO Zhu-mei1,ZHANG Li-xiang2. Analysis of force characteristics and hydrokinetic energy harvesting of four coupling-linked cylinders from vortex-induced vibrations. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(17): 25-29.
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