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Numerical Analysis of Aerodynamic Performance of a Fixed-Pitch Vertical Axis Wind Turbine Rotor

Rogowski Krzysztof, Michna Jan, Ferreira Carlos

Advances in Science and Technology. Research Journal

2024

Vol. 18, no 6

97--109

The aim of this study was to assess the accuracy of predicting the aerodynamic loads and investigate the aerodynamic wake characteristics of a vertical axis wind turbine (VAWT) rotor using a simplified two-dimensional numerical rotor model and an advanced numerical approach - the Scale Adaptive Simulation (SAS) coupled with the four-equation γ-Re_θ turbulence model. The challenge for this approach lies in the operating conditions of the rotor, the blade pitch angles, and the very small geometric dimensions of the rotor. The rotor, with a diameter of 0.3m, operates at a low tip speed ratio of 2.5 and an extremely low blade Reynolds number of approximately 22,000, whereas the pitch angles, β, are: -10, 0, and 10 degrees. Validation was conducted based on high-fidelity measurements obtained using the PIV technique at TU Delft. The obtained results of rotor loads and velocity profiles are surprisingly reliable for cases of β=0° and β=-10°. However, the 2-D model is too imprecise to estimate both aerodynamic loads and velocity fields accurately.

Obliczenia wytrzymałościowe oraz drgania turbiny typu Darrieus

Mazur D.

Pomiary Automatyka Kontrola

2012

R. 58, nr 11

1025-1028

W artykule przedstawiono projekt turbiny wiatrowej wraz z obliczeniami mocy uzależnione od współczynnika cp, prędkości wiatru w przedziale (3 - 10 m/s) oraz analizę MES pionowej turbiny wiatrowej dla maksymalnej prędkości wiatru 10m/s. Do obliczeń wykorzystano profil DU 06-W-200 na łopaty turbiny. Obliczenia MES objęły analizę wytrzymałościową oraz drgania turbiny.

The paper presents the design of a wind turbine with power calculations depending on the ratio cp, the wind speed range (3 - 10 m/s) as well as the FEM analysis of a vertical wind turbine for the maximum wind speed 10m/s. The calculations were based on the DU 06-W-200 profile on the turbine blades. The FEM calculations and strength analysis included the turbine vibrations. This paper presents a model for evaluation of aerodynamic and inertial contributions to deformation of a vertical axis wind turbine VAWT blade. A three-bladed design is more efficient than a four-bladed rotor. A low solidity wind turbine may present self-starting problems as the rotor efficiency is poor at low tip speed ratios. There is the optimum turbine rotational speed for each ambient wind speed at which the maximum efficiency is achieved. The energy production of a fixed-pitch wind turbine can be improved by adjusting the rated airspeed to average wind conditions of the place of installation in order to reach its maximum efficiency. The high-speed discriminant is the essential factor on which the efficiency of wind turbine is dependent. This value is attainable for turbine rotations 24 rad/s. At the uniform wind conditions this turbine at maximum Cp value can reach the power of about 2,3KW. The flow analysis for the 3D model should be performed in case of more accurate analyses. Calculations for different wind speed should be made to determine the turbine optimum operating range.