scholarly journals Influence of Shape and Piezoelectric-Patch Length on Energy Conversion of Bluff Body-Based Wind Energy Harvester

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Changjiang Zhang ◽  
Lin Ding ◽  
Lin Yang ◽  
Zuomei Yang ◽  
Zesheng Yang ◽  
...  
Keyword(s):  
Wind Energy ◽  
Energy Conversion ◽  
Bluff Body ◽  
Energy Harvester ◽  
Vital Role ◽  
Leeward Side ◽  
Square Cylinder ◽  
Peak Voltage ◽  
Piezoelectric Patch ◽  
Patch Length

The technology of scavenging ambient energy to realize self-powered of wireless sensor has an important value in practice. In order to investigate the effects of piezoelectric-patch length and the shape of front bluff body on energy conversion of the wind energy harvester by flow-induced vibration, the characteristics of a piezoelectric wind energy harvester based on bluff body are experimentally studied in this work. Four different section shapes of the bluff body, including triangular cylinder, trapezoidal cylinder, reverse trapezoidal cylinder, and square cylinder, are tested. The piezoelectric patch is attached on the leeward side of the bluff body. The lengths of piezoelectric patch are considered as 1.0D–1.4D (D is the characteristic length of the bluff body). It is found that the length of the piezoelectric patch and the shape of the front bluff body play a vital role in improving the performance of wind energy harvester. For the reverse trapezoidal cylinder and square cylinder, the back-to-back vortex-induced vibration (VIV) and galloping phenomenon can be observed. In addition, the energy harvesting performance of the reverse trapezoidal cylinder piezoelectric harvester is the best. The maximum average peak voltage of 1.806 V and the output power of P=16.3 μW can be obtained when external resistance and the length of piezoelectric patch are 100 KΩ and 1.1D, 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

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

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 A Tuning Fork Frequency Up-Conversion Energy Harvester

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7285
Author(s):  
Qinghe Wu ◽  
Shiqiao Gao ◽  
Lei Jin ◽  
Xiyang Zhang ◽  
Zuozong Yin ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Energy Harvester ◽  
Tuning Fork ◽  
Vibration Mode ◽  
Low Frequency ◽  
Human Movement ◽  
Sensor Nodes ◽  
Storage Device ◽  
Peak Voltage ◽  
Low Frequency Vibration

In this paper, a novel tuning fork structure for self-frequency up-conversion is proposed. The structure has an in-phase vibration mode and an anti-phase vibration mode. The in-phase vibration mode is used to sense the environment vibration, and the anti-phase vibration mode is used for energy conversion and power generation. The low-frequency energy collection and the high-frequency energy conversion can be achieved simultaneously. Theoretical and experimental results show that the tuning fork frequency up-conversion energy harvester has excellent performance. This structure provides the energy harvester with excellent output power in a low-frequency vibration environment. At the resonant frequency of 7.3 Hz under 0.7 g acceleration, the peak voltage is 41.8 V and the peak power is 8.74 mW. The tuning fork frequency up-conversion energy harvester causes the humidity sensor to work stably. The structure has the potential to power wireless sensor nodes or to be used as a small portable vibration storage device, especially suitable for the monitoring of the environment related to human movement.

scholarly journals Design, Modeling, and Experiments of the Vortex-Induced Vibration Piezoelectric Energy Harvester with Bionic Attachments

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Zunlong Jin ◽  
Guoping Li ◽  
Junlei Wang ◽  
Zhien Zhang
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Energy Harvester ◽  
Peak Voltage ◽  
Vortex Induced Vibration ◽  
Energy Capture ◽  
Measured Voltage ◽  
Piezoelectric Energy ◽  
Smooth Cylinder ◽  
Bionic Structure

Since the energy demand increases, the sources of fluid energy such as wind energy and marine energy have attracted widespread attention, especially vortex-induced vibrations excited by wind energy. It is well known that the lock-in effect in vortex-induced vibration can be applied to the piezoelectric energy harvester. Although numerous researches have been conducted on piezoelectric energy harvesting devices in recent years, a common problem of low bandwidth and harvesting efficiency still exists. In order to increase the response amplitude and decrease the threshold wind speed of vortex-induced vibration, a bionic attachment structure is proposed based on the experimental method. In the present work, twelve models are designed according to the size of pits and hemispheric protrusions which are added to the surface of a flexible smooth cylinder. Compared with the smooth cylinder which is taken as a carrier, the harvester with the bionic structure shows stronger energy capture performance on the whole. As the threshold speed decelerates from 1.8m/s to 1 m/s, the bandwidth, on the contrary, increases from 39.3% to 51.4%. Particularly, for the 10 mm pits structure with 5 columns, its peak voltage can reach 47 V, and its peak power can reach 1.21 mW with a resistance of 800 kΩ, 0.57 mW higher than that of the smooth cylinder. Comparatively speaking, the hemispherical projections structure figures with a much more different energy capturing characteristic. Starting from the column, the measured voltage of the hemispherical bionic harvester is much smaller than that of the smooth cylinder, with a peak voltage less than 15 V and a reducing bandwidth. However, compared with the smooth cylinder, hemispheric projections with 3 columns have a better energy capture effect with a measured voltage of 35V, a resistance of 800kΩ, and a wind speed of 3.097 m/s. Besides, its output power also enhances from 0.48 to 0.56 mW.

scholarly journals Comparison of Small-Scale Wind Energy Conversion Systems: Economic Indexes

2020 ◽  
Vol 2 (2) ◽  
pp. 144-155 ◽  
Author(s):  
Muhammad Shahzad Nazir ◽  
Yeqin Wang ◽  
Muhammad Bilal ◽  
Hafiz M. Sohail ◽  
Athraa Ali Kadhem ◽  
...  
Keyword(s):  
Wind Energy ◽  
Energy Conversion ◽  
Rural Areas ◽  
Net Present Value ◽  
Recovery Period ◽  
Cost Effective ◽  
Energy System ◽  
Vital Role ◽  
Small Scale ◽  
Wind Energy Conversion

Wind energy is considered as one of the most prominent sources of energy for sustainable development. This technology is of interest owing to its capability to produce clean, eco-friendly, and cost-effective energy for small-scale users and rural areas where grid power availability is insufficient. Wind power generation has developed rapidly in the past decade and is expected to play a vital role in the economic development of countries. Therefore, studying dominant economic factors is crucial to properly approach public and private financing for this emerging technology, as industrial growth and energy demands may outpace further economic studies earlier than expected. In this study, a strategy-focused method for performing economic analysis on wind energy based on financial net present value, levelized cost of energy, internal rate of return, and investment recovery period is presented. Numerical and simulation results depict the most optimal and economical system from a 3 and a 10 kW wind energy conversion system (WECS). Moreover, the aforementioned criteria are used to determine which WECS range is the most suitable investment with the shortest payback period. Finally, an economically viable and profitable wind energy system is recommended.

Design and Testing of Wind Energy Harvester Based on PVDF

2014 ◽  
Vol 613 ◽  
pp. 185-192 ◽  
Author(s):  
Li Juan Guan ◽  
Feng Xian Bai ◽  
Wei Jie Dong
Keyword(s):  
Wind Energy ◽  
Polyvinylidene Fluoride ◽  
Energy Harvester ◽  
Renewable Resource ◽  
Maximum Power Density ◽  
Peak Voltage ◽  
Wind Speeds ◽  
Piezoelectric Energy ◽  
Series Of Experiments ◽  
Design And Testing

With an increasing concern about renewable resource, piezoelectricity has gained significant importance in research for extracting renewable resource from the environment. In this work, a piezoelectric energy harvester is developed, which composed of polyvinylidene fluoride (PVDF) and a fan structure, to generate electric power from wind energy. The voltage/power responses were evaluated when subjected to various wind speeds. Three laminated piezoelectric PVDF specimens were tested in this study. A series of experiments demonstrated a peak voltage 21.6v and a maximum power density 5.64mw/cm3 is generated respectively when the wind speed is 9m/s.

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