The effect of the boundary layer on the wake of a horizontal axis wind turbine

Energy ◽  
2019 ◽  
Vol 182 ◽  
pp. 1202-1221 ◽  
Author(s):  
Nima Sedaghatizadeh ◽  
Maziar Arjomandi ◽  
Richard Kelso ◽  
Benjamin Cazzolato ◽  
Mergen H. Ghayesh
Keyword(s):  
Boundary Layer ◽  
Wind Turbine ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine

424 Clarification of Boundary Layer around Blade Root of Horizontal Axis Wind Turbine

2013 ◽  
Vol 2013.62 (0) ◽  
pp. 253-254
Author(s):  
Yosuke KAGISAKI ◽  
Yasunari KAMADA ◽  
Takao MAEDA ◽  
Junsuke MURATA ◽  
Daiki SUZUKI
Keyword(s):  
Boundary Layer ◽  
Wind Turbine ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
Blade Root

Laser Doppler Velocimetry (LDV) measurements of airfoil surface flow on a Horizontal Axis Wind Turbine in boundary layer

Energy ◽  
2019 ◽  
Vol 183 ◽  
pp. 341-357 ◽  
Author(s):  
Qing'an Li ◽  
Jianzhong Xu ◽  
Takao Maeda ◽  
Yasunari Kamada ◽  
Shogo Nishimura ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Wind Turbine ◽  
Laser Doppler Velocimetry ◽  
Surface Flow ◽  
Horizontal Axis ◽  
Laser Doppler ◽  
Doppler Velocimetry ◽  
Horizontal Axis Wind Turbine ◽  
Airfoil Surface

scholarly journals A vertical-axis rotor as the adjusting system of a horizontal axis wind turbine

2020 ◽  
pp. 1-14
Author(s):  
Marcin Augustyn
Keyword(s):  
Boundary Layer ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Computational Procedure ◽  
Horizontal Axis ◽  
The Self ◽  
Main Rotor ◽  
Aerodynamic Coefficients ◽  
Horizontal Axis Wind Turbine ◽  
Design Structure

The proposed self-adjusting mechanism consists of a carousel rotor with a vertical axis consisting of two kinematically connected flat blades. The torque of this rotor can change the position of the directing unit and additionally the position of the main propeller in order to direct the wind stream or save the main rotor when the wind is too strong. The theory, principles of operation, and the properties of the self-adjusting system were illustrated by formulas and graphs. Based on research conducted in a boundary layer wind tunnel, the values of the aerodynamic coefficients of the flat blades were determined, and then the power and propeller torque of the rotor were found as a function of the angle of wind attack. A computational procedure provides kinematical and force relations as well as the resulting torque diagrams of the rotor. An example of the use and the design structure of a self-adjusting unit in the case of a horizontal axis wind turbine is presented.

Experimental Study on the Performance and Flow Characteristics of a Small Horizontal Axis Wind Turbine (HAWT)

2003 ◽  
Author(s):  
Isaac Gutierrez ◽  
Atsushi Okajima ◽  
Takahiro Kiwata ◽  
Shigeo Kimura ◽  
Yoshitaro Wakisaka
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Wind Turbine ◽  
Separation Bubble ◽  
Flow Characteristics ◽  
Field Tests ◽  
Horizontal Axis ◽  
Power Coefficient ◽  
Horizontal Axis Wind Turbine ◽  
Oil Film

With the aim of getting basic data to increase the efficiency of a small horizontal axis wind turbine (HAWT) systems, the wind tunnel experiments were carried out to observe flow characteristics of rotating blades of the turbine, using the oil-film visualization technique, and to measure turbine performance. Flow visualization allowed the identification of laminar flow, laminar separation bubble formation, flow reattachment, turbulent boundary layer, and turbulent separation. The complex patterns on the rotating blade surface were confirmed by the oil-film visualization method and identified. When the trip-tape was employed for control of the blade boundary layer, the efficiency was not significantly improved. Field-tests of this turbine were performed also, and averages of wind speed and net power were calculated from the field measured data using the bins method and were compared with wind tunnel performance tests. The results of field-tests showed for this small HAWT that the highest power coefficient value was 30%.

Withdrawal: Computations of Aerodynamic Behaviour of Small Horizontal Axis Wind Turbine with NACA4418 airfoil

2019 ◽  
Author(s):  
Essam E. Khalil ◽  
Gamal E. ElHarriri ◽  
Eslam E. AbdelGhany ◽  
Moemen E. Farghaly
Keyword(s):  
Wind Turbine ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine

scholarly journals Canard optimization for enhancing the performance of small horizontal axis wind turbine at low wind speeds

2020 ◽  
Vol 37 ◽  
pp. 63-71
Author(s):  
Yui-Chuin Shiah ◽  
Chia Hsiang Chang ◽  
Yu-Jen Chen ◽  
Ankam Vinod Kumar Reddy
Keyword(s):  
Wind Turbine ◽  
Urban Areas ◽  
Horizontal Axis ◽  
Power Coefficient ◽  
Peak Performance ◽  
Small Scale ◽  
Horizontal Axis Wind Turbine ◽  
Wind Speeds ◽  
Optimum Parameters ◽  
Low Wind Speeds

ABSTRACT Generally, the environmental wind speeds in urban areas are relatively low due to clustered buildings. At low wind speeds, an aerodynamic stall occurs near the blade roots of a horizontal axis wind turbine (HAWT), leading to decay of the power coefficient. The research targets to design canards with optimal parameters for a small-scale HAWT system operated at variable rotational speeds. The design was to enhance the performance by delaying the aerodynamic stall near blade roots of the HAWT to be operated at low wind speeds. For the optimal design of canards, flow fields of the sample blades with and without canards were both simulated and compared with the experimental data. With the verification of our simulations, Taguchi analyses were performed to seek the optimum parameters of canards. This study revealed that the peak performance of the optimized canard system operated at 540 rpm might be improved by ∼35%.

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