Experimental investigation of helical Savonius rotor with a twist of 180°

Damak, Ali; Driss, Zied; Abid, Mohamed Salah

doi:10.1016/j.renene.2012.10.043

Cited by 122 publications

(49 citation statements)

References 16 publications

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“…Although it is well suited to be integrated in urban environment as mini or micro wind turbine it is inappropriate when high power is requested. For these reasons, several studies have been carried-out in recent years in order to improve its aerodynamic performance [1][2][3][4][5][6][7][8][9][10][11][12][13]. For example, D'Alessandro et al [1] developed a mathematical model of the interaction between the flow field and the rotor blades.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Savonius Wind Rotor Performance for Different External Overlap Ratios

Driss¹

2015

IJFMTS

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Experimental investigations were carried out to study the external overlap ratios effect on the performance of a vertical axis wind rotor of the Savonius type. For thus, an open wind tunnel has been designed and realized in Laboratory of Electro-Mechanic Systems at National School of Engineers of Sfax. This involved also the instrumentation and the necessary equipment for the global characterization of the Savonius wind rotor. Particularly, this research required the setting up of four mounting characterized by different external overlap ratios. The overall performance evaluation of the rotor has been based on the power and dynamic torque coefficients in function of the air velocity speed measured in the test vein of the wind tunnel.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Savonius Wind Rotor Performance for Different External Overlap Ratios

Driss¹

2015

IJFMTS

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“…It has many advantages over others as the constructions are simpler, cheaper, independent of the wind direction and has a good starting torque at lower wind speeds with positive coefficient of static torque [5], [6]. Z. Zhao et al [7] and A. Damak et al [8] stated that the performance in terms of C P using Helical-bladed Savonius compared to Conventional Savonius was improved from C P = 0.15 and C P = 0.16 respectively, to the same value of maximum C P = 0.20. There are four types of Helical rotors with different twisted angles as shown in Figure 1 [7] From [7]- [8] findings, they mentioned that, the highest performance was achieved by the Helical rotor with the angle of 180 and with this configuration, the rotor has some downwind surface parts that exposed to the wind at any rotational angles.…”

Section: Savonius Vawtmentioning

confidence: 99%

“…Z. Zhao et al [7] and A. Damak et al [8] stated that the performance in terms of C P using Helical-bladed Savonius compared to Conventional Savonius was improved from C P = 0.15 and C P = 0.16 respectively, to the same value of maximum C P = 0.20. There are four types of Helical rotors with different twisted angles as shown in Figure 1 [7] From [7]- [8] findings, they mentioned that, the highest performance was achieved by the Helical rotor with the angle of 180 and with this configuration, the rotor has some downwind surface parts that exposed to the wind at any rotational angles. It also produces a continuous positive torque which gives better performance than the Helical rotor with other twist angles.…”

Section: Savonius Vawtmentioning

confidence: 99%

Savonius Wind Turbine Performances on Wind Concentrator

Osman

Rosmin

Hasan

et al. 2017

IJPEDS

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The air streams from the outlet of an air compressor can be used to generate electricity. For instance, if a micro-sized Vertical-Axis Wind-Turbine (VAWT) is installed towards the airflow, some amount of electricity can be generated before being stored in a battery bank. The research's objectives are to design, fabricate and analyze the performance of Helical Savonius VAWT blade rotors, which is tested with and without using a wind concentrator. The Helical Savonius VAWT is tested at 0 cm without the concentrator, whereas the blade rotor is tested at concave-blade position when using the concentrator. The blade and the wind concentrator designs were based on the dimensions and the constant airflow of the air compressor. The findings suggested that the blade produced its best performance when tested using wind concentrator at concave-blade position in terms of angular speed (ω), tip speed ratio (TSR) and the generated electrical power (P E ). The findings concluded that the addition of wind concentrator increases the airflow which then provided better performances on the blades.

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“…The wedging angle is measured between the rotation plane of the wind turbine and the chord; it's equal to β=30° ( Figure 2). To develop various experimental tests required at the laboratory scale, we used a specific instrumentation [8][9][10] (Table 1).…”

Section: Experimental Devicementioning

confidence: 99%

Numerical and Experimental Investigations on the Meshing Model Choice of a NACA2415 Airfoil Wind Turbine Placed in an Open Wind Tunnel

Driss¹,

Chelbi²,

Barhoumi³

et al. 2015

J Phys Math

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IntroductionTo prepare a truly sustainable development, the community recommends increasing the share of renewable resources for electricity generation. The production of electricity by wind turbines is playing a major role. In this context, many scientists have examined the effects of wind turbines parameters design. For example, Hirahara et al.[1] developed a unique and very small wind turbine with a diameter of 500 mm and a small aspect ratio for wide use in urban space. The basic performance was tested for various free stream and load resistance. The airflow around the turbine was investigated using a particle image velocimetry (PIV). Wright and Wood [2] showed that the acceleration and deceleration of the rotor at speeds below its controlled maximum speed for a range of wind speeds were calculated and compared with data. Schreck and Robinson [3] showed that wind turbine blade aerodynamic phenomena can be broadly categorized according to the operating state of the machine, and two particular aerodynamic phenomena assume crucial importance. At zero and low rotor yaw angles, increasing rotation determines blade aerodynamic response. At moderate to high yaw angles, dynamic stall dominates blade aerodynamic. The main goal of the Mirzaei et al. [4] investigation was to understand the flow field structure of the separation bubble formed on NLF-0414 airfoil with glaze-ice accretions using CFD and hot-wire anemometry and comparing these results with previous researches performed on NACA 0012 airfoil. Hu et al. [5] showed that Coriolis and centrifugal forces play important roles in 3D stall-delay. At the root area of the blade, where the high angles of attack occur, the effect of the Coriolis and centrifugal forces is dominant. Thus, it shows apparent stall-delay phenomenon at the inner part of the blade. However, by increasing the Reynolds number, the separation position has a stronger effect than by increasing the Coriolis and centrifugal forces. Sicot et al.[6] investigated the aerodynamic properties of a wind turbine airfoil. AbstractIn this work, we are interested on the numerical and experimental investigations of a NACA2415 airfoil wind turbine placed in an open wind tunnel. The study of the meshing effect on the numerical results was developed using a commercial CFD code based on the resolution of the Navier-Stokes equations in conjunction with the standard k-ε turbulence model. These equations were solved by a finite volume discretization method. The developed numerical results are compared with experimental results to choose the adequate meshing.

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Experimental investigation of helical Savonius rotor with a twist of 180°

Cited by 122 publications

References 16 publications

Evaluation of the Savonius Wind Rotor Performance for Different External Overlap Ratios

Evaluation of the Savonius Wind Rotor Performance for Different External Overlap Ratios

Savonius Wind Turbine Performances on Wind Concentrator

Numerical and Experimental Investigations on the Meshing Model Choice of a NACA2415 Airfoil Wind Turbine Placed in an Open Wind Tunnel

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