A miniature hydro-energy generator based on pressure fluctuation in Kármán vortex street

Wang, Dung-An; Chao, Chia-Wei; Chen, Jyun-Hua

doi:10.1177/1045389x12467517

Cited by 12 publications

(8 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A power output of 10 µW was achieved calculated with a water velocity of 1 m/s. Afterward, many researchers focused on piezoelectric energy harvesting using flow-induced vibration [31][32][33][34]. Shan et al [35] studied a macro fiber composite piezoelectric energy harvester in the water vortex at a fluid velocity of 0.5 m/s, and 1.32 µW of power was generated.…”

Section: Introductionmentioning

confidence: 99%

Power Control Optimization of an Underwater Piezoelectric Energy Harvester

et al. 2018

View full text Add to dashboard Cite

Abstract:Over the past few years, it has been established that vibration energy harvesters with intentionally designed components can be used for frequency bandwidth enhancement under excitation for sufficiently high vibration amplitudes. Pipelines are often necessary means of transporting important resources such as water, gas, and oil. A self-powered wireless sensor network could be a sustainable alternative for in-pipe monitoring applications. A new control algorithm has been developed and implemented into an underwater energy harvester. Firstly, a computational study of a piezoelectric energy harvester for underwater applications has been studied for using the kinetic energy of water flow at four different Reynolds numbers Re = 3000, 6000, 9000, and 12,000. The device consists of a piezoelectric beam assembled to an oscillating cylinder inside the water of pipes from 2 to 5 inches in diameter. Therefore, unsteady simulations have been performed to study the dynamic forces under different water speeds. Secondly, a new control law strategy based on the computational results has been developed to extract as much energy as possible from the energy harvester. The results show that the harvester can efficiently extract the power from the kinetic energy of the fluid. The maximum power output is 996.25 µW and corresponds to the case with Re = 12,000.

show abstract

Section: Introductionmentioning

confidence: 99%

Power Control Optimization of an Underwater Piezoelectric Energy Harvester

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Subsequently, many researchers focused on piezoelectric energy harvesting utilizing flow-induced vibration. The flow-induced vibration includes flutter-induced vibration (FIV) [11][12][13][14] and vortex-induced vibration (VIV) [15][16][17]. As for the FIV, Shan et al [18] investigated a macro fiber composite piezoelectric energy harvester in the water vortex, and 1.32 μW power was generated at a water velocity of 0.5 m/s.…”

Section: Introductionmentioning

confidence: 99%

A Novel Piezoelectric Energy Harvester Using the Macro Fiber Composite Cantilever with a Bicylinder in Water

Song

Shan

et al. 2015

Applied Sciences

View full text Add to dashboard Cite

Abstract:A novel piezoelectric energy harvester equipped with two piezoelectric beams and two cylinders was proposed in this work. The energy harvester can convert the kinetic energy of water into electrical energy by means of vortex-induced vibration (VIV) and wake-induced vibration (WIV). The effects of load resistance, water velocity and cylinder diameter on the performance of the harvester were investigated. It was found that the vibration of the upstream cylinder was VIV which enhanced the energy harvesting capacity of the upstream piezoelectric beam. As for the downstream cylinder, both VIV and the WIV could be obtained. The VIV was found with small L/D, e.g., 2.125, 2.28, 2.5, and 2.8. Additionally, the WIV was stimulated with the increase of L/D (such as 3.25, 4, and 5.5). Due to the WIV, the downstream beam presented better performance in energy harvesting with the increase of water velocity. Furthermore, it revealed that more electrical energy could be obtained by appropriately matching the resistance and the diameter of the cylinder. With optimal resistance (170 kΩ) and diameter of the cylinder (30 mm), the maximum output power of 21.86 μW (sum of both piezoelectric beams) was obtained at a water velocity of 0.31 m/s.

show abstract

“…17, the maximum wing oscillation amplitude (a) is very small compared to the cylinder diameter (D). Because the projected area of the cylinder becomes larger than the total swept area of the wing trailing edge, the input power to this system is expressed as: where ρ is water density and A is the project area of the cylinder, the energy conversion ratio (η), i.e., the total efficiency, of this system is expressed as: for an air flow [11]) and drives with a low output energy compared to our proposed system using VIV and DEG. If Karman vortex street naturally existing in a wake of bridge piers is utilized as input power, η may be equivalent to about 66% because A shown in Eq.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental results show that an instantaneous power of 1.77 μW is generated under a pressure fluctuation frequency of 62 Hz and a pressure amplitude of 0.3 kPa in the Karman vortex street. Wang et al [11] also developed a new miniature hydro-energy generator using a cantilevered piezoelectric beam for harnessing energy from Karman vortex street behind a bluff body in a water flow. This system is capable of producing an output power of 0.7 nW when the pressure oscillates with an amplitude of nearly 0.3 kPa and a frequency of about 52 Hz.…”

Section: Introductionmentioning

confidence: 99%

Innovative Elastomer Transducer Driven by Karman Vortices in Water Flow

Chiba¹,

Hasegawa²,

Waki³

et al. 2017

JMSE-A

View full text Add to dashboard Cite

A simple experimental model of a power generation system was tested in a flowing water tank in order to investigate the performance and feasibility of a small hydroelectric generation system using DE (dielectric elastomer) transducer. The mass of DE material in the power generator module was only 0.1 g. The electric energy generated with a stroke of 10 mm was 12.54 mJ. An electrical energy of approximately 1.5 J per cycle of DE generators can be expected to be generated by scaling up this system, which is capable of being equipped with up to about 100 units of DE transducers. The water velocity was set at 0.30 to 0.70 m/s. This is a small flow, about the same flow as the water in a Japanese garden. This system was driven by Karman vortices in the wake of a cylinder fixed in the water flow. The characteristics of DEs can be utilized to produce electric power effectively. A wing, which is an important part in the generation system to convert fluid energy into mechanical energy, was set behind the cylinder. The wing oscillated due to the pressure caused by Karman vortices, resulting in stretching and contracting of the DE transducers, thus producing electrical power. Experimental results show that an average output power of approximately 31 mW was produced with a generation efficiency of about 66%, when the diameter of the cylinder is 60 mm, the span and chord length of the wing are 120 mm and 30 mm, respectively, the distance between the cylinder and the wing is 170 mm, and the velocity of the water flow is 0.50 m/s.

show abstract

A miniature hydro-energy generator based on pressure fluctuation in Kármán vortex street

Cited by 12 publications

References 43 publications

Power Control Optimization of an Underwater Piezoelectric Energy Harvester

Power Control Optimization of an Underwater Piezoelectric Energy Harvester

A Novel Piezoelectric Energy Harvester Using the Macro Fiber Composite Cantilever with a Bicylinder in Water

Innovative Elastomer Transducer Driven by Karman Vortices in Water Flow

Contact Info

Product

Resources

About