Development of the optimal bluff body for wind energy harvesting using the synergetic effect of coupled vortex induced vibration and galloping phenomena

2019 ◽  
Vol 156 ◽  
pp. 435-445 ◽  
Author(s):  
Wan Sun ◽  
Soohwan Jo ◽  
Jongwon Seok
Keyword(s):  
Energy Harvesting ◽  
Wind Energy ◽  
Bluff Body ◽  
Synergetic Effect ◽  
Vortex Induced Vibration

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.

Y-type three-blade bluff body for wind energy harvesting

2018 ◽  
Vol 112 (23) ◽  
pp. 233903 ◽  
Author(s):  
Feng-Rui Liu ◽  
Hong-Xiang Zou ◽  
Wen-Ming Zhang ◽  
Zhi-Ke Peng ◽  
Guang Meng
Keyword(s):  
Energy Harvesting ◽  
Wind Energy ◽  
Bluff Body

Small-Scale Wind Energy Harvesting From Flow-Induced Vibrations

2011 ◽  
Author(s):  
Vishak Sivadas ◽  
Adam M. Wickenheiser
Keyword(s):  
Energy Harvesting ◽  
Wind Energy ◽  
Boundary Layers ◽  
Vortex Shedding ◽  
Bluff Body ◽  
Environmental Parameters ◽  
Small Scale ◽  
Low Speed ◽  
Structural Deformations ◽  
Flow Induced Vibrations

Significant wind energy exists in the boundary layers around naturally occurring and manmade structures. This energy source has remained largely untapped, even though it presents a significant source of energy for powering wireless devices in built-up areas. This paper discusses a study on harnessing energy from piezoelectric transducers by using bluff body and vortex-induced vibration phenomena induced by low-speed flows. The proposed devices are miniature, scalable, aeroelastic wind harvesters designed for extracting turbulent, low-speed wind energy from the boundary layers around structures. The design configuration consists of a bluff body with a flexible piezoelectric cantilever attached to the trailing edge. In this design, transverse vibrations are induced in the piezoelectric members by alternating vortex shedding. The multi-physics software package COMSOL is used for coupled simulation of the fluid and structural domains, and Matlab is used to couple the structural deformations to the attached power harvesting circuitry. The design and environmental parameters are varied to optimize the configuration and to identify the significant parameters in the design. The lock-in phenomenon, in which the vortex shedding frequency is entrained to the fundamental structural frequency, is exploited to achieve resonance over a range of flow velocities, thus increasing the velocity “bandwidth” of the devices. Simulations are run for different characteristic dimensions or shapes for the bluff body to study the strength and nature of vortex shedding in the presence of vibrating beam sections. The results of parameter variation for the design configuration is presented and discussed with regard to broadband wind energy harvesting.

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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