An experimental study of the two-staged wind turbines

Ushiyama, Izumi; Shimota, Toshihiko; Miura, Yukihiro

doi:10.1016/0960-1481(96)88427-8

Cited by 24 publications

(16 citation statements)

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“…But the maximum efficiency obtained by contra rotors having the same area is increased to 64% [6]. Based on these studies, in order to increase the power efficiency of wind turbines on contra-rotating wind turbines (CRWT) that have two rotors rotating in opposite direction coaxially have been carried out [7][8][9][10][11][12][13][14][15]. These studies are based on the various wind turbine energy assessments and comparison of power output in CRWT with that of SRWT.…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of 30 Kw Contra Rotor Wind Turbine

Kumar

Bensingh

Abraham

2012

ISRN Renewable Energy

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The aim of this study is to optimize and analyze the characteristics of the upwind primary rotor and the downwind secondary rotor of the contra rotor wind turbine to increase the aerodynamic performance by using computational fluid dynamic (CFD). The main objective is to provide maximum energy that can be extracted by the primary and secondary rotor from the renewable resource of wind to increase the thrust power. For this purpose, two kinds of rotor configurations which are 3-bladed single and 3-bladed contra-rotating rotor were compared by using CFD. The results of the primary and secondary rotor are validated with measurements of the 30 KW Contra rotor wind turbine available on literature and plotted for power output. The optimum axial distance between the two rotors are investigated through CFD for increased performance. In addition, the increased thrust and torque for each rotor configuration are compared for aerodynamic feasibility.

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Section: Introductionmentioning

confidence: 99%

Computational Analysis of 30 Kw Contra Rotor Wind Turbine

Kumar

Bensingh

Abraham

2012

ISRN Renewable Energy

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“…For example, Professor I. Ushiyama could increase the output using the model tandem wind rotors (2) . Kowintec Co. Ltd. has succeeded only to increase the output of the prototype wind turbine with the gearbox (3) .…”

Section: Introductionmentioning

confidence: 99%

Performances and Acoustic Noise of Model Intelligent Wind Power Unit

Kubo¹,

Kanemoto²

2024

RE&PQJ

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Abstract. The authors invented the superior wind power unit which is composed of the tandem wind rotors and the double rotational armature type generator without the traditional stator. The large-sized front wind rotor and the small-sized rear wind rotor drive the inner and the outer rotational armatures respectively, as for the upwind type. The unique rotational conditions of the tandem wind rotors and the fundamental performances were presented at the previous papers. Continuously, this paper discusses experimentally the effect of the blade profiles of tandem wind rotors on the performances and investigated the acoustic noise emitted from tandem wind rotors. The output of the tandem wind rotors with the desirable profiles is higher than the output of the traditional single wind rotor. The acoustic noise is induced mainly from the flow interaction between the front and the rear wind rotors, and is dominant at the blade passing frequency.

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“…Kowintec Co., Ltd. has succeeded only to increase the output of the wind turbine using the tandem wind rotors and had the prototype wind turbines (4) . Professor Ushiyama could also increase the output using the tandem wind rotors (5) . On the contrary, the operation of the tandem wind rotors proposed by the authors quite differs from these wind rotors, and is in cooperation with the double rotational armature type generator without the conventional stator.…”

Section: Superior Operation Of Tandem Wind Rotorsmentioning

confidence: 99%

Development of Intelligent Wind Turbine Generator with Tandem Wind Rotors and Double Rotational Armatures (1st Report, Superior Operation of Tandem Wind Rotors)

Kanemoto

Galal

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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This paper proposes the superior wind turbine generator, which is composed of the tandem wind rotors and the double rotational armature type generator without the conventional stator. The large-sized front wind rotor and the small-sized rear wind rotor drive respectively the inner and the outer armatures of the generator, in keeping the rotational torque counterbalanced. Such operating conditions enable to make the output higher than the conventional wind turbine and to keep the output constant in the rated operating mode without using the brake and/or the pitch control mechanisms. Such wonderful advantages in the generating mode are discussed and verified experimentally with the model turbine generator.

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An experimental study of the two-staged wind turbines

Cited by 24 publications

References 0 publications

Computational Analysis of 30 Kw Contra Rotor Wind Turbine

Computational Analysis of 30 Kw Contra Rotor Wind Turbine

Performances and Acoustic Noise of Model Intelligent Wind Power Unit

Development of Intelligent Wind Turbine Generator with Tandem Wind Rotors and Double Rotational Armatures (1st Report, Superior Operation of Tandem Wind Rotors)

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