A novel self-tuning wind energy harvester with a slidable bluff body using vortex-induced vibration

2020 ◽  
Vol 205 ◽  
pp. 112472 ◽  
Author(s):  
Wan Sun ◽  
Jongwon Seok
Keyword(s):  
Wind Energy ◽  
Bluff Body ◽  
Energy Harvester ◽  
Vortex Induced Vibration ◽  
Self Tuning

A hybrid wind energy harvester using a slotted cylinder bluff body

2020 ◽  
Vol 64 (1-4) ◽  
pp. 119-127
Author(s):  
Junlei Wang ◽  
Guoping Li ◽  
Zunlong Jin ◽  
Guobiao Hu ◽  
Kun Zhang ◽  
...  
Keyword(s):  
Wind Speed ◽  
Energy Harvesting ◽  
Wind Energy ◽  
Bluff Body ◽  
Energy Harvester ◽  
Wind Tunnel Test ◽  
Lateral Side ◽  
Vibration Energy Harvester ◽  
Actual Performance ◽  
Vortex Induced Vibration

Harvesting energy from wind to supply low-power consumption devices has attracted numerous research interests in recent years. However, a traditional vortex-induced vibration energy harvester can only operate within a limited range of wind speed. Thus, how to broaden the effective wind speed range for energy harvesting is a challenging issue. In this paper, a slotted cylinder bluff body is proposed for being used in the design of a wind energy harvester. The physical prototype is manufactured and the wind tunnel test is performed for evaluating the actual performance of the prototyped energy harvester. The effect of the orientation of the slot on the performance of the proposed energy harvester is experimentally investigated. As compared to the traditional counterpart without the slot at the lateral side of the bluff body, the proposed energy harvester demonstrates the superiority for realizing broadband energy harvesting. Due to the introduction of the slot, and by carefully tuning the orientation of the slot, both the vortex-induced vibration and the galloping phenomena can be stimulated within two neighboring wind speed ranges, leading to the formation of an extremely broad bandwidth for energy harvesting.

scholarly journals An experimental investigation into a novel small-scale device for energy harvesting using vortex-induced vibration

2020 ◽  
Author(s):  
Farshad Moradi Gharghani ◽  
Mohamad Ali Bijarchi ◽  
Omid Mohammadi ◽  
Mohammad Behshad Shafii
Keyword(s):  
Wind Energy ◽  
Large Scale ◽  
Fossil Fuels ◽  
Energy Harvester ◽  
Electrical Energy ◽  
Small Scale ◽  
Comprehensive Investigation ◽  
Vortex Induced Vibration ◽  
Geometrical Shapes ◽  
Oscillating Plate

Abstract Renewable energies could be a good solution to the problems associated with fossil fuels. The storage of wind energy by means of small-scale devices rather than large-scale turbines is a topic that has gained lots of interest. In this study, a compact device is proposed to harvest wind energy and transform it into electrical energy, by means of oscillations of a magnet into a coil, using the concept of vortex-induced vibration (VIV) behind a barrier. For a more comprehensive investigation, this system is studied from two viewpoints of fluid mechanics (without magnet) and power generation (with the magnet). For this purpose, an oscillating plate hinging on one side and three barriers with different geometrical shapes including cylindrical, triangular and rectangular barriers are used. In addition to the effect of barrier geometry, the impacts of various barriers dimensions, the distance between the plate and the barriers as well as inclination angle of the plate with respect to the horizon on the amplitude of oscillations and generated power are investigated. Results showed that in each case, there is a unique Reynolds number in which the frequency of vortex shedding equals to the frequency of plate oscillation and the output power from the energy harvester device is maximum. Besides, by increasing the barrier dimensions, the amplitude of oscillations increases up to three times, which leads to a higher generated power. Finally, by considering the studied parameters, the best conditions for generating energy using the VIV method are presented for design purposes. Among all the considered cases, the cylindrical barrier with the highest diameter and nearest distance to the plate led to the highest efficiency (0.21%) in comparison with other barriers.

Hydrokinetic Vortex Induced Vibration (VIV) Energy Harvester

2020 ◽  
Author(s):  
Xiaoyu Zhou ◽  
Vesselina Roussinova ◽  
Vesselin Stoilov
Keyword(s):  
Bluff Body ◽  
Energy Harvester ◽  
Electrical Energy ◽  
Average Frequency ◽  
Flow Speed ◽  
Peak Amplitude ◽  
Low Flow ◽  
Bluff Bodies ◽  
Vortex Induced Vibration ◽  
Low Speed

Abstract This paper investigates the performance of vortex-induced vibration (VIV) energy harvester in low-speed water flow. The proposed VIV harvester is extracting hydrokinetic energy from the flowing current and transferring it into mechanical vibrations. The vibrations are further converted into electrical energy using the piezoelectric transducer to supply the modern demand for energy-consumption. To meet the demand, the single harvester is analyzed to determine the suitable geometry for the bluff body that is sensitive to the low-speed flow. Furthermore, the converter must be able to harvest vibrations of varying amplitudes and frequencies. To maximize the power output, different array configurations of multiple bluff bodies are examined. A single positively buoyant elastically mounted cylinder is tested experimentally and at a low flow speed of 0.3 m/s, it can harvest vibrations with an average frequency of 1.8 Hz and peak to peak amplitude of 1.5d, where d is the diameter of the bluff body. It was found that for an array consisting of ten bluff bodies, the average frequency and peak to peak amplitude increases to 2.09Hz and 1.54d, respectively.

A self-tunable wind energy harvester utilising a piezoelectric cantilever beam with bluff body under transverse galloping for field deployment

2021 ◽  
Vol 245 ◽  
pp. 114559
Author(s):  
Yee Yan Lim ◽  
Ricardo Vasquez Padilla ◽  
Andreas Unger ◽  
Rodrigo Barraza ◽  
Ahmed Mostafa Thabet ◽  
...  
Keyword(s):  
Wind Energy ◽  
Cantilever Beam ◽  
Bluff Body ◽  
Energy Harvester ◽  
Piezoelectric Cantilever ◽  
Field Deployment ◽  
Transverse Galloping

Fork-shaped bluff body for enhancing the performance of galloping-based wind energy harvester

Energy ◽  
2019 ◽  
Vol 183 ◽  
pp. 92-105 ◽  
Author(s):  
Feng-Rui Liu ◽  
Wen-Ming Zhang ◽  
Zhi-Ke Peng ◽  
Guang Meng
Keyword(s):  
Wind Energy ◽  
Bluff Body ◽  
Energy Harvester

Development of a novel non-contact piezoelectric wind energy harvester excited by vortex-induced vibration

2021 ◽  
Vol 235 ◽  
pp. 113980
Author(s):  
Shuyun Wang ◽  
Weilin Liao ◽  
Zhonghua Zhang ◽  
Yong Liao ◽  
Mengjia Yan ◽  
...  
Keyword(s):  
Wind Energy ◽  
Energy Harvester ◽  
Vortex Induced Vibration

Adaptive wind energy harvester with transformable bluff body

2021 ◽  
Vol 238 ◽  
pp. 114159
Author(s):  
Sehun Jeon ◽  
Wan Sun ◽  
Hyeonho Jang ◽  
Jongwon Seok
Keyword(s):  
Wind Energy ◽  
Bluff Body ◽  
Energy Harvester

scholarly journals Vortex-induced vibration wind energy harvesting by piezoelectric MEMS device in formation

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yin Jen Lee ◽  
Yi Qi ◽  
Guangya Zhou ◽  
Kim Boon Lua
Keyword(s):  
Energy Harvesting ◽  
Wind Energy ◽  
Power Output ◽  
Energy Harvester ◽  
Transverse Velocity ◽  
Proof Of Concept ◽  
Vortex Induced Vibration ◽  
Effective Manner ◽  
Mems Device ◽  
Piezoelectric Mems

AbstractA silicon chip integrated microelectromechanical (MEMS) wind energy harvester, based on the vortex-induced vibration (VIV) concept, has been designed, fabricated, and tested as a proof-of-concept demonstration. The harvester comprises of a cylindrical oscillator attached to a piezoelectric MEMS device. Wind tunnel experiments are conducted to measure the power output of the energy harvester. Additionally, the energy harvester is placed within a formation of up to 25 cylinders to test whether the vortex interactions of multiple cylinders in formation can enhance the power output. Experiments show power output in the nanowatt range, and the energy harvester within a formation of cylinders yield noticeably higher power output compared to the energy harvester in isolation. A more detailed investigation conducted using computational fluid dynamics simulations indicates that vortices shed from upstream cylinders introduce large periodic transverse velocity component on the incoming flow encountered by the downstream cylinders, hence increasing VIV response. For the first time, the use of formation effect to enhance the wind energy harvesting at microscale has been demonstrated. This proof-of-concept demonstrates a potential means of powering small off-grid sensors in a cost-effective manner due to the easy integration of the energy harvester and sensor on the same silicon chip.

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