Flutter Phenomenon in Flow Driven Energy Harvester–A Unified Theoretical Model for 'Stiff' and 'Flexible' Materials
| Autor: | Ya Yang, Alex Yuandong Gu, Tao Wang, Chengliang Sun, Xiaojing Mu, Zhong Lin Wang, Yu Chen, Weiwei Ren |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Work (thermodynamics) Multidisciplinary Flow (psychology) 02 engineering and technology Bending Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity Article 0104 chemical sciences Flow velocity Flutter Flapping 0210 nano-technology Triboelectric effect |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/srep35180 |
| Popis: | Here, we report a stable and predictable aero-elastic motion in the flow-driven energy harvester, which is different from flapping and vortex-induced-vibration (VIV). A unified theoretical frame work that describes the flutter phenomenon observed in both “stiff” and “flexible” materials for flow driven energy harvester was presented in this work. We prove flutter in both types of materials is the results of the coupled effects of torsional and bending modes. Compared to “stiff” materials, which has a flow velocity-independent flutter frequency, flexible material presents a flutter frequency that almost linearly scales with the flow velocity. Specific to “flexible” materials, pre-stress modulates the frequency range in which flutter occurs. It is experimentally observed that a double-clamped “flexible” piezoelectric P(VDF-TrFE) thin belt, when driven into the flutter state, yields a 1,000 times increase in the output voltage compared to that of the non-fluttered state. At a fixed flow velocity, increase in pre-stress level of the P(VDF-TrFE) thin belt up-shifts the flutter frequency. In addition, this work allows the rational design of flexible piezoelectric devices, including flow-driven energy harvester, triboelectric energy harvester, and self-powered wireless flow speed sensor. |
| Databáze: | OpenAIRE |
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