scholarly journals Potential for Reducing Blade-Tip Acoustic Emissions for Small Wind Turbines: June 1, 2007 - July 31, 2008

2009 ◽  
Author(s):  
P. Migliore
Keyword(s):  
Wind Turbines ◽  
Acoustic Emissions ◽  
Small Wind Turbines ◽  
Blade Tip

Development of a Quality Management System for Electric Power applied to Small Wind Turbines

2012 ◽  
pp. 1083-1088
Author(s):  
O.H. Ando Junior ◽  
M.O. Oliveira ◽  
J.M. Neto ◽  
A.D. Spacek ◽  
R.C.B. Leborgne ◽  
...  
Keyword(s):  
Quality Management ◽  
Electric Power ◽  
Wind Turbines ◽  
Management System ◽  
Quality Management System ◽  
Small Wind Turbines

COMPARATIVE ANALYSIS OF TWO AIRFOILS FOR POSSIBLE UTILIZATION IN SMALL WIND TURBINES

2019 ◽  
Author(s):  
Pedro Baracat ◽  
Célia Rosolen ◽  
Raquel Miguez de Carvalho ◽  
Kamal Ismail ◽  
Willian Okita ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Wind Turbines ◽  
Small Wind Turbines

scholarly journals Numerical Simulations of Novel Conning Designs for Future Super-Large Wind Turbines

2020 ◽  
Vol 11 (1) ◽  
pp. 147
Author(s):  
Zhenye Sun ◽  
Weijun Zhu ◽  
Wenzhong Shen ◽  
Qiuhan Tao ◽  
Jiufa Cao ◽  
...  
Keyword(s):  
Wind Turbines ◽  
Cone Angle ◽  
Angle Of Attack ◽  
Normal Direction ◽  
Velocity Decomposition ◽  
New Concepts ◽  
Blade Tip ◽  
Tip Position ◽  
Large Wind ◽  
Lower Angle

In order to develop super-large wind turbines, new concepts, such as downwind load-alignment, are required. Additionally, segmented blade concepts are under investigation. As a simple example, the coned rotor needs be investigated. In this paper, different conning configurations, including special cones with three segments, are simulated and analyzed based on the DTU-10 MW reference rotor. It was found that the different force distributions of upwind and downwind coned configurations agreed well with the distributions of angle of attack, which were affected by the blade tip position and the cone angle. With the upstream coning of the blade tip, the blade sections suffered from stronger axial induction and a lower angle of attack. The downstream coning of the blade tip led to reverse variations. The cone angle determined the velocity and force projecting process from the axial to the normal direction, which also influenced the angle of attack and force, provided that correct inflow velocity decomposition occurred.

Techno-economic optimisation of small wind turbines using co-design on a parametrised model

2021 ◽  
Vol 45 ◽  
pp. 101165
Author(s):  
Jeroen D.M. De Kooning ◽  
Arash E. Samani ◽  
Simon De Zutter ◽  
Jeroen De Maeyer ◽  
Lieven Vandevelde
Keyword(s):  
Wind Turbines ◽  
Small Wind Turbines

A novel and economic rotor hub configuration for small wind turbines

2021 ◽  
Vol 47 ◽  
pp. 101344
Author(s):  
Abbas Akbari Jouchi ◽  
Abolfazl Pourrajabian ◽  
Saeed Rahgozar ◽  
Maziar Dehghan
Keyword(s):  
Wind Turbines ◽  
Small Wind Turbines

A comprehensive comparative investigation of the Lifting Line Theory and Blade Element Momentum Theory applied to small wind turbines

2021 ◽  
pp. 1-25
Author(s):  
K.A.R. Ismail ◽  
Willian Okita
Keyword(s):  
Wind Turbines ◽  
Power Coefficient ◽  
Computational Time ◽  
Local Flow ◽  
Small Wind Turbines ◽  
Wake Effects ◽  
Line Theory ◽  
Lifting Line ◽  
Lifting Line Theory ◽  
Blade Element

Abstract Small wind turbines are adequate for electricity generation in isolated areas to promote local expansion of commercial activities and social inclusion. Blade element momentum (BEM) method is usually used for performance prediction, but generally produces overestimated predictions since the wake effects are not precisely accounted for. Lifting line theory (LLT) can represent the blade and wake effects more precisely. In the present investigation the two methods are analyzed and their predictions of the aerodynamic performance of small wind turbines are compared. Conducted simulations showed a computational time of about 149.32 s for the Gottingen GO 398 based rotor simulated by the BEM and 1007.7 s for simulation by the LLT. The analysis of the power coefficient showed a maximum difference between the predictions of the two methods of about 4.4% in the case of Gottingen GO 398 airfoil based rotor and 6.3% for simulations of the Joukowski J 0021 airfoil. In the case of the annual energy production a difference of 2.35% is found between the predictions of the two methods. The effects of the blade geometrical variants such as twist angle and chord distributions increase the numerical deviations between the two methods due to the big number of iterations in the case of LLT. The cases analyzed showed deviations between 3.4% and 4.1%. As a whole, the results showed good performance of both methods; however the lifting line theory provides more precise results and more information on the local flow over the rotor blades.

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