scholarly journals Effects of the Angled Blades of Extremely Small Wind Turbines on Energy Harvesting Performance

Mathematics ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 1295 ◽  
Author(s):  
Junseon Park ◽  
Seungjin Lee ◽  
Joong Yull Park
Keyword(s):  
Energy Harvesting ◽  
Wind Turbines ◽  
Load Resistance ◽  
Power Sources ◽  
Low Intensity ◽  
Basic Model ◽  
Computational Fluid Dynamics Analysis ◽  
Small Wind Turbines ◽  
Useful Power ◽  
Blade Geometry

Low-intensity winds can be useful power sources in the context of energy harvesting. This study aims to enhance the power generation capacity of a super micro wind turbine (SMWT) in low-intensity winds by modifying the blade geometry, which cannot be realized in conventional wind turbines owing to the stress concentration. By controlling the curved angle (θ) in the middle of the blade, the rotor performance can be improved, and the rotor diameter can be reduced to increase installation density. Experimental results indicated that the optimal θ value was 105°, at which the AC voltage was improved by 7.4% compared to that in the case of the basic model with θ = 0°. The maximum electric power output was 9.333 μW and the load resistance was 47.62 kΩ. Moreover, a computational fluid dynamics analysis was performed to clarify the pressure field and streamlines on and around the blade to demonstrate the aerodynamic performance of the SMWT. The proposed blade geometry is one of many possible designs that can enhance extremely small wind turbines for energy harvesting.

Development of a Quality Management System for Electric Power applied to Small Wind Turbines

2012 ◽  
pp. 1083-1088
Author(s):  
O.H. Ando Junior ◽  
M.O. Oliveira ◽  
J.M. Neto ◽  
A.D. Spacek ◽  
R.C.B. Leborgne ◽  
...  
Keyword(s):  
Quality Management ◽  
Electric Power ◽  
Wind Turbines ◽  
Management System ◽  
Quality Management System ◽  
Small Wind Turbines

Extended electric power sources

2018 ◽  
Author(s):  
T.A. Konev ◽  
V.A. Kuzmin ◽  
E. Yu. Mutovina ◽  
R.D. Puzhaykin ◽  
Vladimir Salomatov
Keyword(s):  
Electric Power ◽  
Electric Current ◽  
Load Resistance ◽  
Active Power ◽  
Operating Voltage ◽  
Power Sources ◽  
Distributed Parameters ◽  
Analytical Expressions ◽  
Characteristic Resistance ◽  
Length Effects

Chemical sources of current are investigated as lines with distributed parameters. Analytical expressions are obtained for the voltage and active power values of the source at different distances from the beginning of the cell as well as dependences of the working voltage and active power on the source length. Effects of a reduction in the operating voltage and active power are due to the flow of electric current along the source during operation. The magnitude of these effects depends not only on the length of the source, but also on the ratio of characteristic resistance to the load resistance.<br>

COMPARATIVE ANALYSIS OF TWO AIRFOILS FOR POSSIBLE UTILIZATION IN SMALL WIND TURBINES

2019 ◽  
Author(s):  
Pedro Baracat ◽  
Célia Rosolen ◽  
Raquel Miguez de Carvalho ◽  
Kamal Ismail ◽  
Willian Okita ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Wind Turbines ◽  
Small Wind Turbines

scholarly journals Can a Semi-Active Energy Harvesting Shock Absorber Mimic a Given Vehicle Passive Suspension?

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4378
Author(s):  
Jorge A. Reyes-Avendaño ◽  
Ciro Moreno-Ramírez ◽  
Carlos Gijón-Rivera ◽  
Hugo G. Gonzalez-Hernandez ◽  
José Luis Olazagoitia
Keyword(s):  
Energy Harvesting ◽  
Load Resistance ◽  
Ball Screw ◽  
External Energy ◽  
Shock Absorbers ◽  
Great Progress ◽  
Control Circuits ◽  
Minimum Velocity ◽  
Wasted Energy ◽  
At Will

Energy harvesting shock absorbers (EHSA) have made great progress in recent years, although there are still no commercial solutions for this technology. This paper addresses the question of whether, and under what conditions, an EHSA can completely replace a conventional one. In this way, any conventional suspension could be replicated at will, while recovering part of the wasted energy. This paper focuses on mimicking the original passive damper behavior by continuously varying the electrical parameters of the regenerative damper. For this study, a typical ball-screw EHSA is chosen, and its equivalent suspension parameters are tried to be matched to the initial damper. The methodology proposes several electrical control circuits that optimize the dynamic behavior of the regenerative damper from the continuous variation of a load resistance. The results show that, given a target damper curve, the regenerative damper can adequately replicate it when there is a minimum velocity in the damper. However, when the damper velocity is close to zero, the only way to compensate for inertia is through the introduction of external energy to the system.

Techno-economic optimisation of small wind turbines using co-design on a parametrised model

2021 ◽  
Vol 45 ◽  
pp. 101165
Author(s):  
Jeroen D.M. De Kooning ◽  
Arash E. Samani ◽  
Simon De Zutter ◽  
Jeroen De Maeyer ◽  
Lieven Vandevelde
Keyword(s):  
Wind Turbines ◽  
Small Wind Turbines

A novel and economic rotor hub configuration for small wind turbines

2021 ◽  
Vol 47 ◽  
pp. 101344
Author(s):  
Abbas Akbari Jouchi ◽  
Abolfazl Pourrajabian ◽  
Saeed Rahgozar ◽  
Maziar Dehghan
Keyword(s):  
Wind Turbines ◽  
Small Wind Turbines

scholarly journals Modeling of Piezoelectric Energy Harvesting from Freely Oscillating Cylinders in Water Flow

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Min Zhang ◽  
YingZheng Liu ◽  
ZhaoMin Cao
Keyword(s):  
Energy Harvesting ◽  
Free Stream ◽  
Piezoelectric Materials ◽  
Load Resistance ◽  
Stream Velocity ◽  
Piezoelectric Energy Harvesting ◽  
Vibratory System ◽  
System Parameters ◽  
Piezoelectric Energy ◽  
Vortex Induced Vibrations

A concept of energy harvesting from vortex-induced vibrations of a rigid circular cylinder with two piezoelectric beams attached is investigated. The variations of the power levels with the free stream velocity are determined. A mathematical approach including the coupled cylinder motion and harvested voltage is presented. The effects of the load resistance, piezoelectric materials, and circuit combined on the natural frequency and damping of the vibratory system are determined by performing a linear analysis. The dynamic response of the cylinder and harvested energy are investigated. The results show that the harvested level in SS and SP&PS modes is the same with different values of load resistance. For four different system parameters, the results show that the bigger size of cylinder with PZT beams can obtain the higher harvested power.

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