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CFD analysis of energy harvesting from flow induced vibration of a circular cylinder with an attached free-to-rotate pentagram impeller

机译:附有自由旋转的五角星形叶轮的圆柱体的流致振动能量收集的CFD分析

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摘要

A new converter consisting of an elastically mounted circular cylinder and a free-to-rate pentagram impeller is proposed to harness hydrokinetic energy from water currents. The vibration energy of the cylinder and the rotation energy of the impeller are harvested simultaneously. The two-way fluid-structure interaction simulations are employed to investigate the vibration and rotation response of the converter. The simulated Reynolds number range is 14,000 Re 80,000, falling in the TrSL2 (transition of shear layer 2) and TrSL3 regimes. The results indicate that the vibration amplitude of the converter increases with increasing of the flow velocity, and the growth becomes faster at high reduced velocity (U-r). The presence and rotation of the impeller contribute to the hydrodynamic instability of the system at U-r = 9, where the rotational direction is constantly changing. The hydrodynamic instability brings about a wider flow wake and unstable vortex shedding, resulting in the enhancement of vibration and the increase of power. For such a rotation symmetric structure, increasing the torsional friction does not play a significant role in suppressing the hydrodynamic instability. The estimated power generating capacity is sensitive to flow velocity and additional damping ratio. The average power efficiency is about 22.6%, and the power density for a 5D x 5D staggered configuration with zeta(harn), of 0.031374 can reach 885.53 W/m(3).
机译:提出了一种新的转换器,该转换器由弹性安装的圆柱体和自由速率的五角星形叶轮组成,以利用水流中的动能。气缸的振动能量和叶轮的旋转能量被同时收集。采用双向流体-结构相互作用模拟来研究转换器的振动和旋转响应。模拟的雷诺数范围是14,000 = 9时流体动力不稳定,其中旋转方向不断变化。流体动力学的不稳定性导致更宽的流动尾流和不稳定的涡旋脱落,从而导致振动增强和功率增大。对于这种旋转对称结构,增加扭转摩擦在抑制流体动力不稳定性方面没有起到重要作用。估计的发电能力对流速和附加阻尼比敏感。平均功率效率约为22.6%,并且zeta(harn)为0.031374的5D x 5D交错配置的功率密度可以达到885.53 W / m(3)。

著录项

  • 来源
    《Applied Energy》 |2018年第15期|304-321|共18页
  • 作者单位

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China;

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China;

    Univ Western Australia, Sch Civil Environm & Min Engn, Crawley, WA 6009, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Energy harvesting; Vortex induced vibration; Impeller; Free-to-rotate; Power;

    机译:能量收集;涡激振动;叶轮;自由旋转;功率;
  • 入库时间 2022-08-18 00:07:26

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