Experimental study on blade pitch angle effect on the performance of a three-bladed vertical-axis Darrieus hydro turbine

2019 ◽  
Vol 43 (6) ◽  
pp. 2123-2134 ◽  
Author(s):  
Abdelouahab Benzerdjeb ◽  
Bouabdellah Abed ◽  
Habib Achache ◽  
Mohammed K. Hamidou ◽  
Alaxender M. Gorlov
Keyword(s):  
Experimental Study ◽  
Pitch Angle ◽  
Vertical Axis ◽  
Hydro Turbine ◽  
Angle Effect ◽  
Blade Pitch Angle

scholarly journals Experimental investigation of a variable geometry vertical axis wind turbine

2020 ◽  
pp. 0309524X2093513
Author(s):  
Simon A Prince ◽  
Carmine Badalamenti ◽  
Dimitar Georgiev
Keyword(s):  
Experimental Study ◽  
Wind Turbine ◽  
Pitch Angle ◽  
Vertical Axis ◽  
Reynolds Numbers ◽  
Variable Geometry ◽  
Vertical Axis Wind Turbine ◽  
Wind Tunnel Experiments ◽  
Electrical Generator ◽  
Turbine Design

An experimental study is presented on the performance of a vertical axis wind turbine with variable blade geometry of the design developed by Austin Farrah. This is experimentally compared with the performance of a correspondingly sized Bach-type Savonius turbine using the same electrical generator and measurement instrumentation in a wind tunnel. Experiments were performed for Reynolds numbers, based on blade chord, in the range 5 × 103 to 1 × 105, and for blade settings between −40° and +40o. The study shows that for the tip speed ratios that have been investigated, the Farrah vertical axis wind turbine design can only marginally outperform a corresponding two-bladed Bach-type Savonius turbine and then only when its blades are set to 40° pitch angle. The presence of a small inner cylinder, which rotates with the turbine, does not enhance its performance due to the fact that it is immersed in an extensive column of relatively static air.

scholarly journals A Study of a Darrieus Vertical Axis Wind Turbine with a guiding nozzle

2020 ◽  
Vol 207 ◽  
pp. 02011
Author(s):  
Valentin Obretenov ◽  
Rossen Tliev
Keyword(s):  
Experimental Study ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Pitch Angle ◽  
Vertical Axis ◽  
Performance Characteristics ◽  
Vertical Axis Wind Turbine ◽  
Pilot Studies ◽  
Generalized Characteristics ◽  
Turbine Model

This paper presents the results from an experimental study of a Vertical Axis Wind turbine model with a guiding nozzle. The geometry of the nozzle is synthesized by an original methodology. The performance characteristics of the turbine are investigated when changing the number of the blades and their pitch angle. The obtained results allow us to generate generalized characteristics that can be used in the design of new turbines of this type. The results of the pilot studies showing higher efficiency than the classical Darrieus wind turbines (up to 50 % which is close to the Betz limit).

scholarly journals Study of performance of h-rotor darrieus wind turbines

2021 ◽  
Author(s):  
Sandeep Christy R ◽  
◽  
Kousik S C ◽  
Vishal Subramaniam R ◽  
Santhosh Ram R ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Turbine Blade ◽  
Wind Turbines ◽  
Pitch Angle ◽  
Vertical Axis ◽  
Blade Profile ◽  
Rotor Design ◽  
Wind Velocities ◽  
Major Factors ◽  
Blade Pitch Angle

Vertical Axis Wind Turbines (VAWTs) are mostly manufactured keeping in mind the site and conditions that the wind turbine would face. There is a need to know which type of VAWT would be optimal in the conditions present at the installation site. The major factors involved are blade profile, wind velocity and blade pitch angle. This study is undertaken to study these factors and their effects on influencing the efficiency of the VAWT. A model has been made of a Darrieus VAWT with H-rotor design and is analyzed using CFD. An Iso-surface mesh is made on the model with a cylindrical air-filled domain and a κ-ε turbulence model is applied to study the effects of the wind-and-turbine blade interaction. The domain inlet indicates wind velocity; outlet is set to zero atmospheric gauge pressure and the pressure distribution across the turbine blade wall is measured. The top bottom walls of the domain are not part of the interaction. The study shows that the NACA0012 blade profile fares better than the other profiles across the range of wind velocities. However, it is less efficient with an increase in blade pitch angle for the same value of velocity. NACA0015 blade profile gives good performance when it has a zero pitch angle for intermediate and high wind velocities.

Active Blade Pitch Control for Straight Bladed Darrieus Vertical Axis Wind Turbine of New Design

2013 ◽  
Vol 569-570 ◽  
pp. 668-675 ◽  
Author(s):  
P.D. Chougule ◽  
S.R.K. Nielsen ◽  
Biswajit Basu
Keyword(s):  
Wind Speed ◽  
Wind Turbines ◽  
Pitch Angle ◽  
Vertical Axis ◽  
Power Coefficient ◽  
Vertical Axis Wind Turbine ◽  
Stream Tube ◽  
Pitch Control ◽  
Low Wind Speed ◽  
Blade Pitch Angle

As Development of smallvertical axis wind turbines (VAWT) for urban use is becoming an interestingtopic both within industry and academia. However, there are few new designs ofvertical axis turbines which are customized for building integration. These aregetting importance because they operate at low rotational speed producing veryless noise during operation, although these are less efficient than HorizontalAxis Wind Turbines (HAWT). The efficiency of a VAWT has been significantlyimproved by H-Darrieus VAWT design based on double airfoil technology asdemonstrated by the authors in a previous publication. Further, it is well knowthat the variation of the blade pitch angle during the rotation improves thepower efficiency. A blade pitch variation is implemented by active blade pitchcontrol, which operates as per wind speed and position of the blade withrespect to the rotor. A double multiple stream tube method is used to determinethe performance of the H-Darrieus VAWT. The power coefficient is compared withthat of a fixed pitch and a variable pitch double airfoil blade VAWT. It isdemonstrated that an improvement in power coefficient by 20% is achieved andthe turbine could start at low wind speed

scholarly journals MODEL TURBIN ANGIN AIRFOIL NACA 4418 TERHADAP VARIASI BUKAAN SUDUT SUDU PADA KECEPATAN ANGIN BERBEDA

2019 ◽  
Vol 11 (2) ◽  
pp. 97-102
Author(s):  
Yusuf Dewantoro Herlambang ◽  
Budhi Prasetiyo ◽  
Supriyo Supriyo ◽  
Wahyono Wahyono ◽  
Teguh Harijono Mulud
Keyword(s):  
Wind Turbine ◽  
Pitch Angle ◽  
Vertical Axis ◽  
Speed Ratio ◽  
Vertical Axis Wind Turbine ◽  
Tip Speed Ratio ◽  
Blade Pitch Angle

Penelitian ini mengkaji Turbin Angin Sumbu Vertikal (Vertical Axis Wind Turbine) Aerofoil NACA 4418 yang memiliki diameter rotor 560  mm, panjang sudu 800 mm, jumlah sudu 3 buah, serta bahan sudu terbuat dari fiberglass. Selanjutnya menganalis karakteristik turbin angin rotor vertikal 3-sudu tersebut pada kecepatan angin berbeda 5 m/s, 6 m/s, 7 m/s, 8 m/s, dan 9 m/s dengan 5 buah model turbin angin dengan bukaan sudut sudu (blade pitch angle) bervariasi yaitu 00, 100, 200, 300, dan 400. Hasil pengujian turbin angin diperoleh rasio kecepatan sudu (Tip Speed Ratio) yang optimum sebesar 1,7 pada sudut sudu 100 dengan putaran turbin 321 rpm dan kecepatan angin 5,42 m/s. Daya mekanik optimum yang diperoleh adalah 19,4 W pada bukaan sudut sudu sebesar 200 dengan putaran turbin 381 serta kecepatan angin 6,4 m/s. Turbin menghasilkan koesifien daya (Coefficient of Power) optimum yang dihasilkan sebesar 0,202 dengan bukaan sudut sudu sebesar 100 dan putaran turbin 198 rpm, dan daya mekanik yang dihasilkan 8,5 Watt pada variabel pengujian kecepatan sebesar 5,42 m/s.

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