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浙江大学学报(工学版)
J4  2013, Vol. 47 Issue (10): 1784-1789    DOI: 10.3785/j.issn.1008-973X.2013.10.013
    
Hydrodynamic mechanism of fully passive energy harvester
from ocean current
DENG Jian, DAI Bin, SHAO Xue-ming, ZHENG Yao
School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China
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Abstract  

A novel ocean flow energy harvesting device was examined by using the computational fluid dynamic method. The device consists of an oscillating foil mounted on a damper (representing a power generator) and a rotational spring. The basic principle of the fully passive energy harvester relies upon fluid-induced vibrations. The energy harvesting concept was proposed recently to minimize its environmental problems compared to traditional turbine-based devices containing rotating blades, in which large translational speed is reached at the tips of the blades causing serious environmental concerns about noise generation as well as the threat they pose to block passages of migratory fishes. The inertial effect was considered in the dynamic model which is involved in our simulations. Results show that four different responses are recorded in the (b, kα) phase plane. The responses include: 1) the foil returns to its initial position; 2) periodic pitching and heaving motions are excited; 3) pitching in a small range of angles and heavily shifting to one direction; 4) the simulations diverge due to irregular motions and large heaving displacements. Other conclusions include: 1) the maximum harvesting efficiency is reached around 20%; 2) a larger parametrical scope was found for steady energy harvester on the phase plane compared to previous research.

Published: 01 October 2013
CLC:  TV 131.2  
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Cite this article:

DENG Jian, DAI Bin, SHAO Xue-ming, ZHENG Yao. Hydrodynamic mechanism of fully passive energy harvester
from ocean current. J4, 2013, 47(10): 1784-1789.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2013.10.013     OR     http://www.zjujournals.com/eng/Y2013/V47/I10/1784


全被动式海流能量采集系统水动力学机理

采用计算流体力学方法研究基于振荡水翼的海流能量采集系统.该系统包含俯仰与升沉两自由度运动,升沉方向包含阻尼器,俯仰方向包含扭转弹簧,基于流致振荡的原理在均匀来流中形成周期性的能量采集状态.提出该能量采集系统的目的是为了缓解传统采集方式对海洋环境的破坏.在传统的基于旋转叶片的水轮机海流能量采集器中,高速旋转的叶片在叶尖形成高速流动,由此产生的噪音及高速流影响了海洋鱼类的迁徙.对转轴位置与弹簧刚度这2个参数进行研究.结果表明,在(b,kα)相空间中存在4种基本工作状态：1）水翼随着时间演化回到初始状态|2）周期性的俯仰与升沉运动|3）在0°角附近小幅度俯仰振荡而升沉方向沿某一方向漂移|4）由于不规则振荡及升沉方向的大位移,计算发散.其他结论包括：1）最大能量采集效率接近20%|2）与前人研究相比,能够在更大的参数范围内采集到稳定能量.

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