Optimization of Savonius turbines using an obstacle shielding the returning blade

Mohamed, Mohamed H.; Janiga, Gábor; Pap, E.; Thévenin, Dominique

doi:10.1016/j.renene.2010.04.007

Cited by 213 publications

(82 citation statements)

References 13 publications

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“…기본적인 블레이드의 효율 향 상은 형상 설계부터 시작된다. 블레이드의 각도 및 기울기, 그리고 비틀림 각도에 이르기까지 다양한 형상에 따라 블 레이드에 작용하는 토크 및 에너지가 다르기 때문이다 [5,6] . …”

Section: 서 론 2)unclassified

Optimized blade of small vertical axis wind turbine and its vortex structure analysis

Na¹,

Ko²,

Sun³

et al. 2015

Journal of the Korean Society of Visualization

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Abstract. Sensitivity studies of blade angle and twisted angle are numerically investigated to optimize the Savonius blade. As blade angle increases, the contact area between blade and wind decreases, showing the suppression of the vortex generation near blade. Compared to the blade angle of 0 degree, the blade angle of 20 degree shows about 2.6% increment of power efficiency. Based on the blade angle of 20 degree, sensitivity studies of the twisted angle are performed. The result indicates that the adjustment of the twisted angle causes the torque of blade to increase. Optimized blade can suppress the formation of the vortex structure in rear region. Also, wind flows without disturbance of vortex when passing through the optimized blade. The 1kw vertical wind turbine system with optimized blade can generate 4442.2kWh per year and have 53% capacity factor.

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Section: 서 론 2)unclassified

Optimized blade of small vertical axis wind turbine and its vortex structure analysis

Na¹,

Ko²,

Sun³

et al. 2015

Journal of the Korean Society of Visualization

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show abstract

“…This is because the flow structure inside the rotor is complicated and that is why in past investigations were limited only to laboratory tests [1,6,11,10]. Recently attempts were made to analyse the structure of the flow through the Savonius rotor numerically [7,9]. Most of data presented on the numerical aspect are mostly two-dimensional.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Study on the Performance of an Innovative Vertical-Axis Wind Turbine

Kludzińska¹,

Tesch²,

Doerffer³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. This paper introduces the innovative modification of the Savonius wind turbine being able to significantly increase efficiency in comparison with the classic design. This innovative design is equipped with a stator directing the flow. The presence of the stator increases the active surface area and generates higher torques acting on a shaft. Additionally, it makes it possible to take better advantage of wind energy and compensate the effect of larger active surface area. The larger the stator angle the higher the efficiency. One of the biggest problem of the classic design, namely its relatively low efficiency, is overcome.The results of an experimental investigation, carried out in the closed return wind tunnel, are presented for various conditions and configurations. These include the most important characteristic such as the torque and power coefficient as a function of the tip speed ratio. Furthermore, a three dimensional numerical analysis of the transient phenomena occurring in the innovative turbine is investigated. Evaluation and comparison criteria are proposed in order to evaluate and compare various designs and solutions. This makes it possible to explain the increased efficiency of the innovative design.

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“…A circularly ducted Savonius rotor equipped with a number of identical wind concentrators and diffusers along the periphery of circular housing produced efficiency of the order of 40%. In order to eliminate the low aerodynamic performance of Savonius wind rotors, Mohamed et al [10] studied several shapes of obstacles and deflectors placed in front of two and three blades Savonius turbine. A rounded deflector structure was placed in front of two counter-rotating turbines.…”

Section: Introductionmentioning

confidence: 99%

Study of the bucket design effect on the turbulent flow around unconventional Savonius wind rotors

Driss

Mlayeh

Driss

et al. 2015

Energy

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Optimization of Savonius turbines using an obstacle shielding the returning blade

Cited by 213 publications

References 13 publications

Optimized blade of small vertical axis wind turbine and its vortex structure analysis

Optimized blade of small vertical axis wind turbine and its vortex structure analysis

An Experimental and Numerical Study on the Performance of an Innovative Vertical-Axis Wind Turbine

Study of the bucket design effect on the turbulent flow around unconventional Savonius wind rotors

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