耦合四圆柱涡激振动的力特性及水动能获取分析

PDF(2057 KB)

振动与冲击 ›› 2015, Vol. 34 ›› Issue (17) : 25-29.

论文

罗竹梅1，张立翔2

作者信息 +

Analysis of force characteristics and hydrokinetic energy harvesting of four coupling-linked cylinders from vortex-induced vibrations

LUO Zhu-mei1，ZHANG Li-xiang2

Author information +

文章历史 +

摘要

涡激振动是一种常见的流固耦合现象，结构物振幅较大时，可利用涡激振动从海洋流中或河流中获取能量。论文通过流固双向耦合数值方法，模拟均匀来流下，弹性支撑刚性连接的耦合四圆柱在不同横向和流向间距比下的横向涡激振动。分析横向和流向间距比对该耦合结构涡激振动时的压力和升力特性及获取能量和能量密度的影响。结果表明：各种组合间距比下，上端两圆柱的升力系数均值CL与下端两圆柱的CL关于CL=0对称，压力系数幅值Ap关于θ =180o对称，但其升力系数均方根值却近似相等；获取的水动能及能量密度随着组合间距比的增加先增加，随后获取能量增加缓慢，而能量密度却不断减少，因此选择合理的横向和流向间距比可从单位水体的海洋流或河流中获取更多的水动能。

Abstract

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.

导出引用

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[J]. Journal of Vibration and Shock, 2015, 34(17): 25-29

参考文献

[1] Bernitsas M M，Raghawan Y，Ben-Simon E M H，et al. VIVACE (vortex induced vibration for aquatic clean energy)：A new concept in generation of clean and renewable energy from fluid flow[J].Journal of Offshore Mechanics and Arctic Engineering，2008，130 (4)：1-15.
[2] Barrero-Gil A，Alonso G，Sanz-Andres A. Energy harvesting from transverse galloping [J].Journal of Sound and Vibration，2010，329：2873 - 2883.
[3] Lee J H, Xiros N, Bernitsas M M. Virtual damper-spring system for VIV experiments and hydrokinetic energy conversion[J].Ocean Engineering, 2011, 38(5-6): 732-747.
[4] Bernitsas M M，Ben-Simon Y，Raghavan K， et al. The VIVACE converter：model tests at high damping and Reynolds number around105 [J]. Journal of Offshore Mechanics and Arctic Engineering，2009，131 (1)：1-12.
[5] Lam K, Gong W Q, So R M C. Numerical simulation of cross-flow around four cylinders in an in-line square configuration [J]. Journal of Fluids and Structures, 2008, 24:34-57.
[6] Lam K, Zou L. Experimental and numerical study for the cross-flow around four cylinders in an in-line square configuration [J]. Journal of Mechanical Science and Technology, 2007, 21:1338-1343.
[7] 曲雪，薛鸿祥，唐文勇. 深海顶张式立管顺流涡激振动响应预报方法[J].振动与冲击，2013，32(15): 32-36.
QU Xue, XUE Hong-xiang, TANG Wen-yong. In-line VIV analysis of deep-water top tensioned riser [J].Journal of Vibration and Shock,2013,32(15):32-36.
[8] 徐枫，欧进萍. 正三角形布置三圆柱绕流与涡致振动数值模拟[J]. 空气动力学学报，2010，28（5）：582-590.
XU Feng，OU Jin-ping. Numerical simulation of vortex-induced vibration of three cylinders subjected to a cross f low in equilateral arrangement [J]. Acta Aerodynamic Sinica，2010，28（5）：582 - 590.
[9] Lam K, Zou L. Three-dimensional numerical simulations of cross-flow around four cylinders in an in-line square configuration [J]. Journal of Fluids and structures, 2010,26：482 - 502.
[10] Zou L, Lin Y F. Flow patterns and force characteristics of laminar flow past four cylinders in diamond arrangement [J]. Journal of Hydrodynamics, 2011, 23(1):55-64.
[11]Zhao M, Cheng L. Numerical simulation of vortex-induced vibration of four circular cylinders in a square configuration[J/OL]. Journal of Fluids and Structure. [2012-04-02].
http://dx.doi.org/10.1016/j.jfluidstructs.2012.04.002.
[12]罗竹梅，张立翔. 基于流固双向耦合的圆柱体涡激振动模拟[J].昆明理工大学学报，2013,38(3):107-112.
LUO Zhu-mei, ZHANG Li-xiang. Numerical Simulation of Vortex-Induced Vibration of Cylinder Based on Two-Way Fluid-Structure Coupling [J]. Journal of Kunming University of Science and Technology, 2013, 38(3): 107-112.