Results 21 to 30 of about 372,321 (309)
General momentum theory for wind turbines at low tip speed ratios
Wind Energy, 2010 ABSTRACTGeneral momentum theory is used to study the behaviour of the ‘classical’ free vortex wake model of Joukowsky. This model has recently attained considerable attention as it shows the possibility of achieving a power performance that greatly exceeds the Lanchester‐Betz limit for rotors running at low tip speed ratios. This behaviour is confirmed
Jens N. Sørensen, Gijs A. M. van Kuik
openaire +1 more source
A Magnus Wind Turbine Power Model Based on Direct Solutions Using the Blade Element Momentum Theory and Symbolic Regression [PDF]
, 2017 A model of the power coefficient of a mid-scale Magnus wind turbine using numerical solutions of the Blade Element Momentum Theory and symbolic regression is presented. A direct method is proposed for solving the nonlinear system of equations which govern
Calderón-Muñoz, William +3 more
core +1 more source
Analysis of Structural Responses of a Horizontal Axis Wind Turbine at Maximum Aerodynamic Performance [PDF]
Journal of Applied and Computational MechanicsThis numerical analysis investigates the interplay between fluid dynamics and structural mechanics within a horizontal axis wind turbine. Tip speeds ranging from 1 to 8.1 are explored, focusing on blade structural responses at maximum aerodynamic ...
Ahmed TAIBAOUI +2 more
doaj +1 more source
An Axial Hydro-Kinetic Turbine for Optimum Power Extraction Using Tidal Dams [PDF]
Iranica Journal of Energy and Environment, 2018 The present paper describes analytical optimization and numerical simulation of a modern hydro-kinetic turbine. It was a tidal turbine with twin elliptic-rotors. The turbines were installed within the twin ducts inside of a tidal dam.
A. Zahedi Nejad, P. Zahedi Nejad
doaj +1 more source
Journal of Fluid Science and Technology, 2016 Effect of the Reynolds number on the torque and power characteristics of a small straight-bladed vertical axis wind turbine has been investigated experimentally under various wind velocity.
Seiji YAMADA +2 more
doaj +1 more source
Online Estimation of Wind Turbine Tip Speed Ratio by Adaptive Neuro-Fuzzy Algorithm [PDF]
International Journal of Advanced Computer Science and Applications, 2018 The efficiency of a wind turbine highly depends on the value of tip speed ratio during its operation. The power coefficient of a wind turbine varies with tip speed ratio. For maximum power extraction, it is very important to hold the tip speed ratio at optimum value and operate the variable-speed wind turbine at its maximum power coefficient.
Aamer Bilal, Xiaodong Liu
openaire +1 more source
The Effect of Leading-Edge Wavy Shape on the Performance of Small-Scale HAWT Rotors
Energies, 2023 The purpose of this experimental work was to investigate the role of the leading-edge wavy shape technique on the performance of small-scale HAWT fixed-pitch rotor blades operating under off-design conditions.
Riad Morina, Yahya Erkan Akansu
doaj +1 more source
Airfoil Design for Vertical Axis Wind Turbine Operating at Variable Tip Speed Ratios [PDF]
The Open Mechanical Engineering Journal, 2015 A new airfoil design method for H type vertical axis wind turbine is introduced in the present study. A novel indicator is defined to evaluate vertical axis wind turbine aerodynamic performance at variable tip speed ratios and selected as the airfoil design objective.
Mei Yi, Qu Jianjun, Li Yan
openaire +1 more source
Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2017 The most primitive control method of wind turbines used to generate electric energy from wind is the fixed speed control method. With this method, it is not possible that turbine input power is transferred to grid at maximum rate.
Murat Karabacak +4 more
doaj +1 more source
Study the effect of suction flow control on the aerodynamic performance of a wind turbine using 2D section numerical Results [PDF]
مهندسی مکانیک شریف, 2021 In the present work, the numerical investigation of a wind turbine airfoil with suction flow control is initially performed to find the relative improvement in its erodynamic efficiency. Consequently the study of turbine performance is accomplished using
M. Asghari +2 more
doaj +1 more source