Skewed wake induction effects on thrust distribution on small wind turbine rotors

2001 ◽  
Author(s):  
K. Chaney ◽  
A. Eggers, Jr. ◽  
P. Moriarty ◽  
W. Holley
Keyword(s):  
Wind Turbine ◽  
Small Wind Turbine ◽  
Thrust Distribution ◽  
Turbine Rotors

Skewed Wake Induction Effects on Thrust Distribution on Small Wind Turbine Rotors

2001 ◽  
Vol 123 (4) ◽  
pp. 290-295 ◽  
Author(s):  
Ken Chaney ◽  
Alfred J. Eggers, ◽  
Patrick J. Moriarty ◽  
William E. Holley
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Wind Speeds ◽  
Small Wind Turbine ◽  
Cylindrical Vortex ◽  
Thrust Distribution ◽  
Wake Effects ◽  
Rotor Disk ◽  
Turbine Rotors ◽  
Wake Model

Accurate prediction of both the center of thrust location and the magnitude of the thrust on a rotor disk are critical to satisfactory modeling of the yawing of small wind turbines to large angles to passively control overshoots in power and loads at higher wind speeds. Of the two, the prediction of the center of thrust location upwind of the center of a yawed rotor disk appears to be the most uncertain and potentially in serious error. This error is due to uncertainties in skewed wake effects on the thrust distribution on the disk. Three skewed wake models are examined to better understand the potential sources of error. First is the dynamic inflow model originally developed for helicopters, and second is a modification of this model developed for wind turbines. Third is an earlier cylindrical vortex wake model which pioneered the study of skewed wake effects for helicopters, and which can be generalized for wind turbine applications. It is concluded that this generalized model and the original dynamic inflow model are the most promising for small wind turbine applications, and their predictions of center of thrust and blade root moments are compared for an idealized rotor. The focus is on static equilibrium loads, and note is taken of the potential importance of accounting for expanding wake effects. The basic results of the study are applicable to large as well as small wind turbine rotors.

scholarly journals Numerically and Experimentally Verified Design of a Small Wind Turbine with Injection Molded Blade

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 776
Author(s):  
Byunghui Kim ◽  
Sang-June Park ◽  
Seokyoung Ahn ◽  
Myung-Gon Kim ◽  
Hyung-Gun Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Power Systems ◽  
Wind Turbine ◽  
Wind Power ◽  
Offshore Wind ◽  
Power Coefficient ◽  
Manufacturing Method ◽  
Small Wind Turbine ◽  
Verification Methods ◽  
Wind Power Systems

Although mega-watt class onshore and offshore wind power systems are used to generate power due to their cost-effectiveness, small wind power systems are important for household usages. Researchers have focused on aerodynamic characteristics as a conceptual design from their previous studies on Archimedes spiral wind turbines. Here, we verified the design of a small wind turbine AWM-750D (100 W capacity) via both numerical simulation and experimentation. We used commercial code ANSYS CFX for numerical simulation and compared turbulence models and surface roughness for determining the performance. To obtain reliable and robust blades, we analyzed the effective manufacturing method with Moldflow. Through a test with an open-suction type atmospheric boundary layer wind tunnel, we varied wind speed from 4.0 m/s to the rated value of 12.5 m/s and obtained 106 W, equivalent to a power coefficient of 0.205. In addition, we compared the numerical and experimental power vs. rotational speed and found the former is 6.5% lower than the latter. In this study, we proved that numerical simulations can act as design verification methods to predict wind turbine performances and reliable manufacturing. Through our research, we provided the prototype of a small wind turbine with 100 W to act as an efficient electric power supplier for households and also the stable manufacturing process for complex spiral blades using injection molding.

Testing basic performance of a very small wind turbine designed for multi-purposes

2005 ◽  
Vol 30 (8) ◽  
pp. 1279-1297 ◽  
Author(s):  
Hiroyuki Hirahara ◽  
M. Zakir Hossain ◽  
Masaaki Kawahashi ◽  
Yoshitami Nonomura
Keyword(s):  
Wind Turbine ◽  
Small Wind Turbine ◽  
Basic Performance
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