A full-scale prediction method for wind turbine rotor noise by using wind tunnel test data

2014 ◽  
Vol 65 ◽  
pp. 257-264 ◽  
Author(s):  
Jaeha Ryi ◽  
Jong-Soo Choi ◽  
Seunghoon Lee ◽  
Soogab Lee
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Test Data ◽  
Wind Tunnel Test ◽  
Prediction Method ◽  
Turbine Rotor ◽  
Full Scale ◽  
Rotor Noise ◽  
Wind Turbine Rotor

Blockage effect correction for a scaled wind turbine rotor by using wind tunnel test data

2015 ◽  
Vol 79 ◽  
pp. 227-235 ◽  
Author(s):  
Jaeha Ryi ◽  
Wook Rhee ◽  
Ui Chang Hwang ◽  
Jong-Soo Choi
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Test Data ◽  
Wind Tunnel Test ◽  
Turbine Rotor ◽  
Wind Turbine Rotor ◽  
Blockage Effect

Development of a Scaled Rotor Blade for Tank Tests of Floating Wind Turbine Systems

2018 ◽  
Author(s):  
Paul Schünemann ◽  
Timo Zwisele ◽  
Frank Adam ◽  
Uwe Ritschel
Keyword(s):  
Wind Turbine ◽  
Rotor Blade ◽  
Turbine Rotor ◽  
Full Scale ◽  
Power Coefficient ◽  
Speed Ratio ◽  
Model Scale ◽  
Floating Wind Turbine ◽  
Hydrodynamic Effects ◽  
Wind Turbine Rotor

Floating wind turbine systems will play an important role for a sustainable energy supply in the future. The dynamic behavior of such systems is governed by strong couplings of aerodynamic, structural mechanic and hydrodynamic effects. To examine these effects scaled tank tests are an inevitable part of the design process of floating wind turbine systems. Normally Froude scaling is used in tank tests. However, using Froude scaling also for the wind turbine rotor will lead to wrong aerodynamic loads compared to the full-scale turbine. Therefore the paper provides a detailed description of designing a modified scaled rotor blade mitigating this problem. Thereby a focus is set on preserving the tip speed ratio of the full scale turbine, keeping the thrust force behavior of the full scale rotor also in model scale and additionally maintaining the power coefficient between full scale and model scale. This is achieved by completely redesigning the original blade using a different airfoil. All steps of this redesign process are explained using the example of the generic DOWEC 6MW wind turbine. Calculations of aerodynamic coefficients are done with the software tools XFoil and AirfoilPrep and the resulting thrust and power coefficients are obtained by running several simulations with the software AeroDyn.

Development of a Wind Tunnel Test Apparatus for Horizontal Axis Wind Turbine Rotor Testing

2008 ◽  
Author(s):  
Michael McWillam ◽  
David Johnson
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Wind Turbines ◽  
High Speed ◽  
Turbine Rotor ◽  
Dynamic Stall ◽  
Flow Structures ◽  
Horizontal Axis Wind Turbine ◽  
Wind Turbine Rotor ◽  
Blade Geometry

The engineering of wind turbines is not fully mature. There are still phenomena, particularly dynamic stall that cannot be accurately modeled. Dynamic stall contributes to fatigue stress and premature failure in many turbine components. The three dimensionality of dynamic stall make these structures unique for wind turbines. Currently flow visualization of dynamic stall on a wind turbine rotor has not been achieved, but these visualizations can reveal a great deal about the structures that contribute to dynamic stall. Particle Image Velocimetry (PIV) is a powerful experimental technique that can take non-intrusive flow measurements of planar flow simultaneously. High-speed cameras enable time resolved PIV can reveal the transient development. This technique is suited to gain a better understanding of dynamic stall. A custom 3.27 m diameter wind turbine has been built to allow such measurements on the blade. The camera is mounted on the hub and will take measurements within the rotating domain. Mirrors are used so that laser illumination rotates with the blade. The wind turbine will operate in controlled conditions provided by a large wind tunnel. High-speed pressure data acquisition will be used in conjunction with PIV to get an understanding of the forces associated with the flow structures. Many experiments will be made possible by this apparatus. First the flow structures responsible for the forces can be identified. Quantitative measurements of the flow field will identify the development of the stall vortex. The quantified flow structures can be used to verify and improve models. The spatial resolution of PIV can map the three dimensional structure in great detail. The experimental apparatus is independent of the blade geometry; as such multiple blades can be used to identify the effect of blade geometry. Finally flow control research in the field of aviation can be applied to control dynamic stall. These experiments will be subject of much of the future work at the University of Waterloo. Potentially this work will unlock the secrets of dynamic stall and improve the integrity of wind turbines.

Rotor Scaling Methodologies for Small Scale Testing of Floating Wind Turbine Systems

2015 ◽  
Author(s):  
Steven Martin ◽  
Sandy Day ◽  
Conor B. Gilmour
Keyword(s):  
Wind Turbine ◽  
Turbine Rotor ◽  
Full Scale ◽  
Small Scale ◽  
Aerodynamic Loads ◽  
Rotor Design ◽  
Floating Wind Turbine ◽  
Accurate Design ◽  
Wind Turbine Rotor ◽  
Blade Element

Two scaling methodologies are presented to address the dissimilitude normally experienced when attempting to measure global aerodynamic loads on a small scale wind turbine rotor from a full scale reference. The first, termed direct aerofoil replacement (DAR), redesigns the profile of the blade using a multipoint aerofoil optimisation algorithm, which couples a genetic algorithm (GA) and XFOIL, such that the local non-dimensional lift force is similar to the full scale. Correcting for the reduced Reynolds number in this manner allows for the non-dimensional chord and twist distributions to be maintained at small scale increasing the similitude of the unsteady aerodynamic response; an inherent consideration in the study of the aerodynamic response of floating wind turbine rotors. The second, the geometrically free rotor design (GFRD) methodology, which utilises the Python based multi-objective GA DEAP and blade-element momentum (BEM) code CCBlade, results in a more simplistic but less accurate design. Numerical simulations of two rotors, produced using the defined scaling methodologies, show an excellent level of similarity of the thrust and reasonably good torque matching for the DAR rotor to the full scale reference. The GFRD rotor design is more simplistic, and hence more readily manufacturable, than the DAR, however the aerodynamic performance match to the full scale turbine is relatively poor.

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