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基于挠曲电效应悬臂梁风致振动能量收集器阵列的试验研究
Experimental Study on Energy Collector Array for Wind Induced Vibration of Cantilever Beams Based on Flexoelectric Effect
投稿时间:2023-07-25  修订日期:2023-10-26
DOI:
中文关键词:  挠曲电效应  驰振  钝体悬臂梁能量收集器  流固耦合  风洞
英文关键词:Flexoelectricity, Galloping, Cantilever Beam, Energy Collector, Wind Tunnel
基金项目:微尺度挠曲电复合材料结构及高能密度风致振动能量收集
作者单位邮编
骆英* 江苏大学 212000
廖兴川 江苏大学 212000
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中文摘要:
      针对无线传感网络(WSNs)节点稳定供能的需求,在基于压电效应的悬臂梁能量收集器的基础上结合挠曲电材料在微尺度具有大应变梯度的尺度效应且易于悬臂梁能量收集器的小型化、阵列化的优点,研制了考虑挠曲电效应的悬臂梁弹性支撑钝体的能量收集器,并将多个能量收集器组成阵列的形式以提高整体的功率水平。利用风洞试验研究处于横向风场中各个柱体的相对位置对阵列中能量收集器功率水平的影响并得到各个能量收集器的归一化功率值。总结出错列排布方式对于多柱体阵列排布的可行性,尤其在双方柱试验中,下游能量收集器的功率水平得到增强。实际应用中应避免串列排布方式的出现,即避免选择较小的横向间距,否则将导致下游方柱剪切流的形成受到上游方柱尾流的抑制,使下游方柱振动减弱。而对于纵向间距同样不宜选择过小,否则将导致下游方柱形成的剪切流抑制上游方柱的漩涡脱落进而使上游方柱的振动减弱。选择合适的纵横向间距能使得阵列中多个方柱的振动得到增强从而提高能量收集器阵列的俘能水平。
英文摘要:
      In response to the demand for stable power supply for Wireless Sensor Networks (WSNs), a novel energy collector was developed by combining the advantages of piezoelectric effects in a cantilever beam-based system with the scale effect of flexoelectric materials, which exhibit significant strain gradients at microscales. This combination allows for downsizing and arraying the energy collector effectively. This energy collector utilizes cantilever beams with elastic support for blunted bodies, considering the flexoelectric effect. Multiple energy collectorss are arranged in an array to collectively enhance the overall power output. Wind tunnel experiments were conducted to investigate the impact of the relative positioning of these devices within a cross-flow wind field. The normalized power output of each energy collector within the array was analyzed. It was observed that staggered positioning is feasible for multi-device arrays, especially evident in the case of dual-body experiments. The power output of downstream energy collectors was notably enhanced. In practical applications, it is advisable to avoid a serial arrangement to prevent the occurrence of small transverse spacing. Doing so could hinder the formation of shear flows around downstream bodies, suppressed by the wake of upstream bodies, ultimately weakening the vibrations of the downstream bodies. Similarly, excessively small longitudinal spacing should be avoided to prevent the inhibition of the vortex shedding of upstream bodies by the shear flows created by the downstream bodies, leading to a reduction in the vibrations of upstream bodies. Proper selection of longitudinal and transverse spacings within the array can amplify the vibrations of multiple bodies in the array, thereby improving the overall power conversion efficiency of the energy collector array.
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