Simulation analysis based performance comparison for vertical axis wind turbines
01 Nov 2016-pp 334-339
TL;DR: In this article, a novel wind turbine is proposed by improving the structure of Savonius wind turbine in order to increase the low wind energy utilization efficiency, and the simulation results show that the new wind turbine has high load capacities at different situation.
Abstract: Traditional Savonius wind turbine has advantages such as simple structure, fast start-up, etc., however, it also has significant disadvantages of low wind energy utilization efficiency. A novel wind turbine is proposed by improving structure of Savonius wind turbine in order to increase the low wind energy utilization efficiency. To compare performance of the novel wind turbine and the Savonius wind turbines with two and three blades, two working conditions are investigated. The first is that the wind turbines work in a certain wind speed level to investigate influence of the changing load. The other is that the wind turbines work in a certain tip speed ratio level to investigate influence of environment such as wind speed changing. Considering costs of prototypes, the Computational Fluid Dynamics transient simulation method is used to achieve the analysis. The simulation results show that the novel wind turbine has high load capacities at different situation. The novel wind turbine has higher wind energy utilization efficiency and has good operating characteristics in low wind speed range than traditional Savonius wind turbines.
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22 Apr 2020
TL;DR: In this article, the authors used the parameters input wind speeds from 0 to 20m/s to find the maximum power that can be generated by the horizontal axis wind turbine by varying its pitch angle.
Abstract: Converting wind energy into electrical energy, an intermediary in the form of a turbine and generator is needed. Wind turbines consist of several types, such as horizontal axis wind turbines (HAWT) and vertical axis wind turbines (VAWT). The main focus of this research is the maximum power that can be generated by the horizontal axis wind turbine by varying its pitch angle. Some important parameters that influence the value of turbine power are wind speed, turbine rotation speed, blade number, pitch angle, and power coefficient (CP). Variation pitch angle from 00, 100, 200, 300, and 400. Pitch angle affects the lifting force of the horizontal axis wind turbine to rotate, just as in the lift force of the aircraft. In this research use the parameters input wind speeds from 0 m/s to 20 m/s. If the wind speed more than 20 m/s, then the wind cannot be utilized and can be said to be a disaster. The Input of turbine rotation speed starts from 0 rpm to 50 rpm. The axes used to make power curves in 3 dimensions are the wind speed axis, turbine rotation speed axis, and power axis. From this curve, we will find the maximum power that can be produced by horizontal wind turbines. The difference in pitch angle on the turbine will produce different power. Increase in wind speed will increase the power of wind turbines. In this study using maximum wind speed of 20 m/s, so that at maximum wind speed will obtain maximum wind turbine power. For horizontal axis wind turbines with pitch angle of 00, maximum power 1608.45 W is produced at 32 rpm wind turbine rotor rotation speed. At 100 pitch angle, maximum power 1510.28 W is produced at 32 rpm turbine rotor rotation speed. At 200 pitch angle, maximum power 1398.65 W is produced at the turbine rotational speed 33 rpm. On the pitch angle 300, the maximum power 1286.75 W is produced at the turbine rotor rotation speed 33 rpm. The pitch angle 400 produces maximum power 1148.89 W at turbine rotor rotational speed 34 rpm. From all simulation results, it was concluded that increase of pitch angle, maximum power produced by the turbine will decrease.
2 citations
TL;DR: In this paper, the performance of three blade vertical axis wind turbine is discussed and 2D computational flow analysis is carried out for different rotational speeds of the blades in a plane normal to wind turbine axis.
Abstract: This paper discusses the performance of three blade vertical axis wind turbine. 2D computational flow analysis is carried out for different rotational speeds of the blades in a plane normal to wind turbine axis. It is implied that turbine blades have infinite aspect ratio. The selection is done based on the lift and drags generated by the various NACA series airfoil (NACA 0012, NACA 0015, NACA 0018, and NACA 0021) at a different angle of attacks, among them NACA 0015 airfoil is found to be most suitable one. A triangular meshed geometry is created and computational fluid dynamics (CFD) simulation is carried out. The computational analysis is performed at various speeds of VAWT blade rotation where the position of the airfoil is made with respect to the wind. Torques generated at different blade positions in a VAWT and the forces by the turbine over one full complete cycle were studied.
2 citations
Cites background or methods from "Simulation analysis based performan..."
...Song et al. (2016) investigated the performance of novel VAWT system considering the influence of load over the wind speed levels, and influence of wind speeds over the tip speed ratios using the CFD transient simulation method....
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...According to Song et al. (2016) the results shows that the designed wind turbine has higher loading capacities with better efficiencies than the traditional VAWTs....
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...…(CFD) has shown a great scope for analysing the VAWT performance and behaviour of aerodynamic characteristics (Beri and Yao, 2011; McLaren et al., 2012; Muneer et al., 2015; Vassberg et al., 2005; Song et al., 2016; Petružela and Blažek, 2017; Castelli et al., 2011; Dobrev and Massouh, 2011)....
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...But in recent years a computational approach based on the computational fluid dynamics (CFD) has shown a great scope for analysing the VAWT performance and behaviour of aerodynamic characteristics (Beri and Yao, 2011; McLaren et al., 2012; Muneer et al., 2015; Vassberg et al., 2005; Song et al., 2016; Petružela and Blažek, 2017; Castelli et al., 2011; Dobrev and Massouh, 2011)....
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01 Dec 2018
TL;DR: This device provides green energy for mobile phone charging where the utility is not available and is able to produce the desired output voltage to charge the mobile phone.
Abstract: Wind energy based power generation has become one of the focal points in the research of renewable energy sources. Mobile phones are essential communication devices nowadays but still people face difficulties in mobile phone charging where the utility supply is not available. This paper presents a design and implementation of a small scale low speed wind power based portable mobile phone charger. The implementation includes a savonius wind turbine and a controller. According to the speed change of the wind, the output voltage of the generator changes from 1V to 3V so a controller is designed to control a DC-DC boost converter to get a constant output voltage. The formal approach of the PI control scheme is used in the design of the controller. The integrated device is able to produce the desired output voltage to charge the mobile phone. This device provides green energy for mobile phone charging where the utility is not available.
2 citations
Additional excerpts
...A two blade savonius rotor is selected which shows better performance than three blade rotor [5]....
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01 Jan 2019
TL;DR: In this article, a Savonius turbine is designed and tested above a bluff body and a 3D numerical model is developed to calibrate the CFD model to conduct further optimization studies on such turbines.
Abstract: This chapter introduces a simple way to improve the power coefficient Cp of a Savonius turbine by installing it above a cuboidal building. Both wind tunnel and towing tests are conducted first. For this, a Savonius turbine is designed and tested above a bluff body. Experimental measurements of the vehicle speed and the wind turbine power are conducted. 3D numerical model is then developed. The measured Cp is then used to calibrate our CFD model to conduct further optimization studies on such Savious wind turbines.
1 citations
14 Apr 2020
TL;DR: In this article, the authors presented the VAWT performance with variations in the number of blades to obtain higher output power than previous research, the results of this research are for vertical turbine with 2 blades, produce a maximum power 489,48 W and torque 17,35 N.m.
Abstract: Renewable energy have advantages such as free of air pollution and the availability of energy source always available in nature. Problem that is currently trending is how renewable energy technology can produce as much power as possible. For this reason researchers continue to develop renewable energy technologies. In this article the vertical axis wind turbine (VAWT) performance will be presented to produce power with variations in the number of blades. The goal is to obtain higher output power than previous research. Wind turbines with different number of blades will produce different output power as well. The experiment will use turbines with 2, 3 and 4 blades. The different number of blades will affect the value of the turbine power constant (Cp), this value is very influential on the output power and torque turbine. The results of this research are for vertical turbine with 2 blades, produce a maximum power 489,48 W and torque 17,35 N.m. In the turbine with 3 blades, produces a maximum power 499,89 W and torque 17,72 N.m. The next for the turbine with 4 blades, produces maximum power 516,43 W and torque 18,3 N.m. The maximum power of VAWT with 4 blades 516,43 W in this research is higher than the maximum power in previous research 505,69 W. The maximum power of the turbine is obtained when the turbine at rotation speed 33 rpm, while the largest torque can be generated when the turbine at rotation speed of 25 rpm.
1 citations
References
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TL;DR: In this article, a combined experimental and computational study into the aerodynamics and performance of a small scale vertical axis wind turbine (VAWT) was presented, where wind tunnel tests were carried out to ascertain overall performance of the turbine and two-and three-dimensional unsteady computational fluid dynamics (CFD) models were generated to help understand the aerodynamic of this performance.
631 citations
"Simulation analysis based performan..." refers methods in this paper
...applied the RNG kturbulence model to a study of three-blade Darrieus wind turbine simulation, and the result agreed well with tunnel experiments [12]....
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TL;DR: In this paper, a helical Savonius rotor with a twist of 90° was proposed to decrease the variation in static torque from 0° to 360°, and the performance of the helical rotor with and without shaft was compared in an open jet wind tunnel.
258 citations
"Simulation analysis based performan..." refers methods in this paper
...tested performance of a helical Savonius wind rotor and maximum experimental power coefficient was obtained 18% [7]....
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TL;DR: In this article, the performance of a Savonius wind turbine with constant cross-sections is examined by means of quasi 2D flow predictions executed in ANSYS CFX, in a way that allows comparison with wind tunnel data presented in a related paper.
217 citations
"Simulation analysis based performan..." refers background or methods in this paper
...Kacprzak et al. compared performance of the Classical and so-called Bach-type Savonius rotor, and turbine design with an Elliptical blade shape was also modeled [5]....
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...[4], Kacprzak et al [5], and Altan et al....
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...For the Savonius wind rotor, Shaheen et al. [4], Kacprzak et al [5], and Altan et al. [11] proposed that the optimum configuration of the overlap ratio (OL) of Savonius wind rotor is 0.15 when wind energy utilization is at maximum level....
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...compared performance of the Classical and so-called Bach-type Savonius rotor, and turbine design with an Elliptical blade shape was also modeled [5]....
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TL;DR: In this paper, the influence of the buckets overlap ratio of a Savonius wind rotor on the averaged moment and power coefficients, over complete cycles of operation, is discussed, based on the commercial software Star-CCM+.
190 citations
TL;DR: In this paper, a mathematical model of the interaction between the flow field and the rotor blades was developed and validated by comparing its results with data obtained at Environmental Wind Tunnel (EWT) laboratory of the “Polytechnic University of Marche”.
156 citations
"Simulation analysis based performan..." refers methods in this paper
...carried out experimental and numerical study on a Savonius rotor to gain an insight into the complex flow field developing around the rotor and to evaluate its performance [6]....
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