...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Fluids and Structures >Performance of a flapping foil flow energy harvester in shear flows
【24h】

Performance of a flapping foil flow energy harvester in shear flows

机译：箔片流动能量收集器在剪切流中的性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Through numerical simulations, we investigate the energy harvesting performance of a heaving/pitching foil in shear flow. With two-dimensional Navier-Stokes simulations, we examined the energy harvesting efficiencies of such a system in linear shear flows and compared the results with those in uniform flows. It is found that in low shear rates, the performance of the system in linear shear flow is slightly higher than that in uniform flow, whereas the energy harvesting efficiency is greatly diminished if the shear rate is sufficiently high (this effect is more pronounced in higher frequencies). This is attributed to the effects of linear shear on the vorticity generation and the synchronization between fluid forcing and foil motion - when a strong shear flow is introduced the lift force induced by the leading edge vortex that is in phase with the heaving motion of the foil is diminished. Furthermore, by studying the instability of the wake behind the foil, we confirm that the optimal performance of the foil in linear shear flows is associated with the same physical mechanism that controls the performance of the foil in uniform flows, i.e. the excitation of the most unstable modes in the wake when the oscillation frequency of the foil is close to the frequencies of these modes.(C) 2014 Elsevier Ltd. All rights reserved.
机译：通过数值模拟，我们研究了剪切流中隆起/倾覆箔片的能量收集性能。通过二维Navier-Stokes模拟，我们检查了线性剪切流中该系统的能量收集效率，并将结果与​​均匀流中的结果进行了比较。发现在低剪切速率下，系统在线性剪切流下的性能略高于均匀流下的性能，而如果剪切速率足够高，则能量收集效率会大大降低（在较高剪切速率下，该效果更为明显）。频率）。这归因于线性剪切对涡度的产生以及流体强迫与箔片运动之间的同步的影响-当引入强剪切流时，由前缘涡旋感应的升力与箔片的垂升运动同相减少了。此外，通过研究箔片后面尾流的不稳定性，我们确认箔片在线性剪切流中的最佳性能与控制箔片在均匀流中的性能的相同物理机制（即最大的激发）相关。当箔的振荡频率接近这些模式的频率时，唤醒时处于不稳定模式。（C）2014 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号