Using crank-crank mechanism to reorient flat blades of vertical wind turbine for improving its performance

Khader, Khaled M.; Nada, Omayma A.

doi:10.1016/j.aej.2020.07.020

Cited by 3 publications

(6 citation statements)

References 20 publications

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“…The VAWT presented in this paper is particularly designed to be enclosed in self-oriented rotating hollow cylindrical container with special opening. The expected power coefficient for such a turbine has been mathematically assessed using the mathematical model developed in [46], and the obtained values are promising compared with other VAWTs. To check the validity of the proposed VAWT design, a prototype has been developed and tested using a wind tunnel.…”

Section: Discussionmentioning

confidence: 99%

“…Design A novel idea has been presented in [46] for enhancing the VAWT design which necessitates using self-oriented flat blades for improving the efficiency of the VAWT. Khader and Nada in [46] proofed analytically that, the introduced novel design has 57% increasing rate of VAWT power coefficient compared with the usage of the traditional VAWT that has the same number of Savonius blades. Mainly, this novel design relies on employing a Crank-Crank mechanism that is effectively capable of providing a self-oriented ability for the turbine's flat blades.…”

Section: Theoretical Basis Of the Proposed Vawtmentioning

confidence: 99%

“…The swept area (A s ) depends upon the ratio (  ), which equal to the blade width (W) divided by the radius (r). This ratio can be selected within the range (1≤  <√2) for avoiding the interference between the rotating blades as recommended in [46]. The swept area (A s ) can be formulated as follows;…”

Section: The System Modeling Of the Vawt Proposedmentioning

confidence: 99%

“…The theoretical turbine's power coefficient (C P ) at (  =1) of VAWT which has four flat blades can be formulated as in [46], as follows;…”

Section: The System Modeling Of the Vawt Proposedmentioning

confidence: 99%

“…Generally, there is a distinct lack of research considering instantaneously redirecting the blades to promptly face the wind direction. On the other hand, a few of research presented novel ideas for continually reorienting the blades to face the wind direction as in [46], rather than focusing on using wind guiding devices or other design parameters commonly addressed. Accordingly, this paper is concerned with introducing a new concept for the VAWTs; in which the main objective is continuously redirecting the turbine blades to completely face the air during the whole cycle of rotation.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Performance of Vertical Wind Turbine Using Gears and Timing Belt Mechanism to Reorient the Turbine's Blades

Khader

2020

ERJ. Engineering Research Journal

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Vertical Axis Wind Turbines (VAWTs) are steadily continued to gain more attention from both academia and governments as they can provide promising solutions for harnessing wind energy in locations with modest wind speeds as well as varying wind directions. In spite of all of the flexibility in working conditions as well as low installation costs and ease of maintenance associated with the VAWTs, their lower efficiency levels significantly obstruct their competiveness in the wind energy field. Therefore, enhancing the performance of such turbines is very critical in exploiting their full potential. Accordingly, this paper proposed a mechanical mechanism which is mainly consists of gears and timing belt that are specially designed to effectively enable the turbine blades to instantaneously reorient themselves to face the wind direction. Also, the proposed turbine is enclosed in a specially designed cage with a rear blade attached to it. This rear blade, as affected by the wind, is responsible for making the cage redirect itself such that its inlet is facing the wind direction. To test the validity of the introduced concept, a VAWT prototype with the proposed mechanism has been manufactured and tested using wind tunnel. The test results demonstrated the self-oriented capability of new design that guaranteed maintaining a continuous perpendicular position between the affecting wind direction and the blade surface. The experimental results also confirmed the expected efficiency improvements and the assessed natural theoretically frequencies ensured that the developed turbine can safely rotate with considerably high angular speeds with no resonance risks.

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Section: Discussionmentioning

confidence: 99%

Section: Theoretical Basis Of the Proposed Vawtmentioning

confidence: 99%

Section: The System Modeling Of the Vawt Proposedmentioning

confidence: 99%

“…The theoretical turbine's power coefficient (C P ) at (  =1) of VAWT which has four flat blades can be formulated as in [46], as follows;…”

Section: The System Modeling Of the Vawt Proposedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving the Performance of Vertical Wind Turbine Using Gears and Timing Belt Mechanism to Reorient the Turbine's Blades

Khader

2020

ERJ. Engineering Research Journal

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Dynamic Performance Enhancement of Vertical Wind Turbine Using Composite Blades Reinforced by Zinc-Oxide Nanoparticles. (Dept. M.)

Khader¹,

Mansour²,

Fahham³

et al. 2020

MEJ. Mansoura Engineering Journal

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rapid depletion of fossil fuels is the major concern of the industrial countries' over the last decades. Fortunately, the rapid depletion problem can be resolved using clean and cheap renewable resources like wind and solar energy. These renewable energy sources can compensate for the shortage between the growing demand and the available traditional types of energies in countries that are suffering from insufficient traditional energies. Apparently, renewable energy sources can be used in many applications which include generating cheap electricity for the deprived communities in the desert areas in addition to powering the desalination plants for producing the

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Pitch Angle Modulation of the Horizontal and Vertical Axes Wind Turbine Using Fuzzy Logic Control

2021

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The aim of this research work is to modulate the pitch angle of both types of wind turbines based on fuzzy logic control (FLC), as changes in the pitch angle have various functions in horizontal and vertical axis wind turbines. For HAWT, pitch angle control is applied to shield the electrical components of the turbine when the wind speed exceeds the rated speed without shutting down the turbine. FLC is used to control the angular velocity using two inputs and one output with three membership functions for both inputs and output. In VAWT, pitch angle control is applied to boost the performance of the turbine and its self-starting torque. FLC utilizes two inputs and one output with five membership functions for both inputs and output. For both turbine types, FLC produces a control signal that drives the actuator to achieve the desired pitch angle. The dynamics of HAWT and VAWT are simulated by the MATLAB/Simulink to demonstrate the influence of pitch controls on their dynamics. For HAWT, the FLC control has successfully maintained the angular speed of the rotor. The values of tip speed ratio and coefficient of performance are reduced in order to maintain the rotor angular velocity at its rated value. On the other hand, the results showed that the torque produced by the VAWT individual blade has improved with the pitch angle control. In addition, using FLC to control the pitch angle gives enhanced output and higher Cp at low tip speed ratios. Gain schedule PI controller is also used in both HAWT and VAWT for comparative study.

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Using crank-crank mechanism to reorient flat blades of vertical wind turbine for improving its performance

Cited by 3 publications

References 20 publications

Improving the Performance of Vertical Wind Turbine Using Gears and Timing Belt Mechanism to Reorient the Turbine's Blades

Improving the Performance of Vertical Wind Turbine Using Gears and Timing Belt Mechanism to Reorient the Turbine's Blades

Dynamic Performance Enhancement of Vertical Wind Turbine Using Composite Blades Reinforced by Zinc-Oxide Nanoparticles. (Dept. M.)

Pitch Angle Modulation of the Horizontal and Vertical Axes Wind Turbine Using Fuzzy Logic Control

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