Design of low noise airfoil with high aerodynamic performance for use on small wind turbines

2010 ◽  
Vol 53 (1) ◽  
pp. 75-79 ◽  
Author(s):  
Taehyung Kim ◽  
Seungmin Lee ◽  
Hogeon Kim ◽  
Soogab Lee
Keyword(s):  
Wind Turbines ◽  
Aerodynamic Performance ◽  
Low Noise ◽  
Small Wind Turbines

Prediction of Aerodynamic Noise Radiated From a Vertical-Axis Wind Turbine

2003 ◽  
Author(s):  
Akiyoshi Iida ◽  
Akisato Mizuno ◽  
Kyoji Kamemoto
Keyword(s):  
Flow Field ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Sound Source ◽  
Vertical Axis ◽  
Aerodynamic Performance ◽  
Low Noise ◽  
Aerodynamic Noise ◽  
Speed Ratio ◽  
Vertical Axis Wind Turbine

Unsteady flow field and flow induced noise of vertical axis wind turbine are numerically investigated. The flow field is numerically calculated by the vortex method with core-spreading model. This simulation obtains aerodynamic performance and aerodynamic forces. Aerodynamic noise is also simulated by using Ffowcs Williams-Hawkings equation with compact body and low-Mach number assumptions. Tip speed of rotor blades are not so high, then the contribution of the moving sound source is smaller than that of the dipole sound source. Since the maximum power coefficient of VAWT can be obtained at lower tip-speed ratio compared to the conventional, horizontal axis wind turbines, the aerodynamic noise from vertical axis wind turbine is smaller than that of the conventional wind turbines at the same aerodynamic performance. This result indicates that the vertical axis wind turbines are useful to develop low-noise wind turbines.

scholarly journals Performance of Crossflow Wind Turbines in In-line Configuration and Opposite Rotation Direction

2021 ◽  
Vol 81 (1) ◽  
pp. 131-139
Author(s):  
Zainal Arifin ◽  
Dominicus Danardono Dwi Prija Tjahjana ◽  
Suyitno Suyitno ◽  
Wibawa Endra Juwana ◽  
Rendhy Adhi Rachmanto ◽  
...  
Keyword(s):  
Wind Turbines ◽  
Turbine Blades ◽  
Performance Testing ◽  
Electrical Energy ◽  
Low Noise ◽  
Power Coefficient ◽  
Rotation Direction ◽  
Turbine Performance ◽  
Line Configuration ◽  
Small Wind Turbines

Wind energy sources must be investigated to produce electrical energy from a renewable source. Crossflow wind turbines are suitable for use because they have several advantages such as self-starting ability, low noise, and excellent stability. They have the potential to be applied as small wind turbines in urban districts because of their small maximum coefficient of power (Cp), which is 10% of that of other small wind turbines. To enhance the performance of crossflow wind turbines, we changed the turbine to rotate in the opposite direction in the in-line configuration. Turbine performance testing was tested using a wind tunnel. The characteristics of crossflow wind turbines were investigated, then turbine performance was analyzed and discussed. The maximum power coefficient obtained was 0.169 (Cp) with the configuration of 12 turbine blades at a wind speed of 10 m/s. The maximum torque coefficient obtained was 0.703. The overall results show that the crossflow wind turbine in in-line configuration with opposite rotation can improve the performance of wind turbines.

STUDY ON AERODYNAMIC PERFORMANCE OF THE BIONIC AIRFOIL BASED ON THE SWALLOW'S WING

2013 ◽  
Vol 13 (06) ◽  
pp. 1340022 ◽  
Author(s):  
WEIJUN TIAN ◽  
FANGYUAN LIU ◽  
QIAN CONG ◽  
YURONG LIU ◽  
LUQUAN REN
Keyword(s):  
Wind Tunnel ◽  
Wind Turbines ◽  
Lift Coefficient ◽  
Angle Of Attack ◽  
Aerodynamic Performance ◽  
Wind Tunnel Tests ◽  
Small Wind Turbines ◽  
Aerodynamic Performances ◽  
Drag Ratio ◽  
Bionic Airfoil

This paper demonstrates the design of the airfoil of small wind turbines, the bionic airfoil was inspired by the morphology of the swallow's extended wing. The wind tunnel tests on the bionic and standard airfoils NACA4412 were conducted, and the aerodynamic performances of the airfoils were numerically investigated. The results show that the bionic airfoil has better aerodynamic performance, the lift coefficient and lift-drag ratio are larger than those of the NACA4412; with the angle of attack increases, both the bionic and standard airfoils stall, but the stall characteristics of the bionic airfoil are better.

scholarly journals EXPERIMENTAL EVALUATION OF THE AERODYNAMIC PERFORMANCE OF SMALL WIND TURBINES CONFECTIONED IN 3D PROTOTYPING

2016 ◽  
Vol 15 (2) ◽  
pp. 15
Author(s):  
S. O. Garré ◽  
A. V. Paula ◽  
J. L. R. Luz ◽  
T. D. J. Vecina ◽  
A. P. Petry
Keyword(s):  
Velocity Profile ◽  
Wind Turbines ◽  
Experimental Evaluation ◽  
Angular Position ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Performance ◽  
Power Coefficient ◽  
Small Wind Turbines ◽  
Static Torque

This paper presents the experimental evaluation of the aerodynamic performance of two small wind turbines models with five blades in the Aerodynamic Tunnel Professor Debi Pada Sadhu. The models were confectioned on a reduced scale using 3D prototyping, the first one was designed using the blade element method, assuming the power coefficient of Betz, named Optimal Blade Betz (OBB) and the second is modified from the first one, named Optimal Blade Betz Modified (OBBM). The velocity distribution in the cross section of the tunnel was determined with the aid of a Pitot tube before the evaluation of the equipment. With the known tunnel velocity profile, the static torque of the prototypes were determined with the use of a digital torquemeter coupled to the machine axis, which recorded the readings for the speed range of 1 m/s to 9.88 m/s. Also with the torquemeter, were evaluated the influence of the angular position of the blades in the measured torque. The blades were designed allowing vary their angular position in the hub, thus changing the angle of attack, and by consequence, the torque produced. A photo tachometer was employed to measure the rotation of the model in free spin. With the experimental data, the curves of static torque and angular velocity were determined as a function of incident speed. Through experimental determination of the incident velocity profile and the velocity profile in the aerodynamic wake of each turbine, the variation of the amount of momentum of the outflow was evaluated, and so the power extracted by the rotor in free rotation. This study aims to contribute to the design of a real small wind turbine, informing the aerodynamic characteristics of the equipment that can be constructed with this layout. The experimental results demonstrate good approximation for torque and power to the results obtained by evaluation by element of the blade method. The turbine constructed with Optimal Betz Blades presented static torque 17.8% higher than constructed with the Modified Blades and extracted 22% more power from the air outflow.

Dimple Shape Effect on the Aerodynamic Performance of H-Rotor Darrieus Vertical Axis Wind Turbine

2021 ◽  
Author(s):  
Kabita Naik ◽  
Niranjan Sahoo
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Turbulence Models ◽  
Vertical Axis ◽  
Aerodynamic Performance ◽  
Low Noise ◽  
Speed Ratio ◽  
Shape Effect ◽  
Vertical Axis Wind Turbine ◽  
Ansys Fluent

Abstract Nowadays, the vertical axis wind turbines (VAWTs) have gained significant attention among the small wind turbine (WT) due to their omnidirectional ability, low costs, low noise, and robustness, mainly for urban and off-shore applications. The H-rotor Darrieus is one of the class of VAWT that is mostly suitable for low-speed wind and low tip speed ratio (TSR) conditions. These VAWTs have relatively lesser performance than horizontal axis wind turbines (HAWTs). Therefore, to improve the performance of the H-rotor Darrieus VAWT, a dimple/cavity of different shapes is created into the surface of the blade airfoil as a power augmentation technique. The current study presents several two-dimensional numerical simulations on the H-rotor Darrieus VAWT in the turbulent flow. The performance of the VAWT has been examined through ANSYS Fluent solver with different turbulence models, and it is found that the Shear stress transport (SST) k–ω turbulence model shows better results. The study primarily focuses on the effect of the dimple location, diameter and shape to enhance the aerodynamic performance of the H-rotor Darrieus VAWT. It is found that the rotor performance is increased by about 13% with a quadral/rectangular dimple in comparison to without dimple. Further, with the inclusion of a dimple on the rotor blade airfoil, its performance is not only enhanced but also able to maintain it for a broad range of TSR. Thus, the present study suggests the implication of a dimple/cavity to be very promising in improving H-rotor Darrieus VAWT.

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