Results 11 to 20 of about 372,321 (309)
Rotor aerodynamic power limits at low tip speed ratio using CFD [PDF]
Journal of Physics: Conference Series, 2014 When investigating limits of rotor aerodynamic models, the Betz limit serves as a solid marker of an upper limit which no model should be able to exceed. A century ago Joukowsky (1912) proposed a rotor aerodynamic model utilizing a rotating actuator disc with a constant circulation.
Mikkelsen, Robert Flemming +3 more
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Aerodynamic Separability in Tip Speed Ratio and Separability in Wind Speed- a Comparison [PDF]
Journal of Physics: Conference Series, 2014 From extensive application over a number of years, it has been established that the nonlinear rotor aerodynamics of typical medium and large wind turbines exhibit an effectively global separability property. Two versions of the separability of aerodynamic torque for variable speed wind turbines are investigated here; the separated function, related to ...
Gala Santos, M L +2 more
openaire +1 more source
Performance Analysis and Optimization of a Vertical-Axis Wind Turbine with a High Tip-Speed Ratio
Energies, 2021 In this work, the aerodynamic performance and optimization of a vertical-axis wind turbine with a high tip-speed ratio are theoretically studied on the basis of the two-dimensional airfoil theory.
Liang Li +3 more
doaj +1 more source
Study on flow around straight-bladed vertical axis wind turbine under low tip speed ratio
Journal of Fluid Science and Technology, 2014 The flow field around a vertical axis wind turbine (VAWT) is very complicated because the blades pass in non-uniform flow field by the blade wake during rotation.
Qing'an LI +5 more
doaj +1 more source
Energies, 2021 In this study, the performance of offshore wind turbines at low tip speed ratio (TSR) is studied using computational fluid dynamics (CFD), and the performance of offshore wind turbines at low tip speed ratio (TSR) is improved by revising the blade ...
Lin Pan +3 more
doaj +1 more source
Towards smart blades for vertical axis wind turbines: different airfoil shapes and tip speed ratios
Wind Energy Science, 2022 Abstract. Future wind turbines will benefit from state-of-the-art technologies that allow them to not only operate efficiently in any environmental condition but also maximise the power output and cut the cost of energy production. Smart technology, based on morphing blades, is one of the promising tools that could make this possible. The present study
M. R. Tirandaz +3 more
openaire +4 more sources
Wind Turbine Power Curve Design for Optimal Power Generation in Wind Farms Considering Wake Effect
Energies, 2017 In modern wind farms, maximum power point tracking (MPPT) is widely implemented. Using the MPPT method, each individual wind turbine is controlled by its pitch angle and tip speed ratio to generate the maximum active power.
Jie Tian +5 more
doaj +1 more source
Effects of the vertical axis wind turbine on the velocity field of the wake flow
Nihon Kikai Gakkai ronbunshu, 2014 This paper deals with the wake flow behind a vertical axis wind turbine, focusing on the variation in the wake structure relative to the tip-speed ratio λ.
Mami WATANABE +2 more
doaj +1 more source
Wake Expansion and the Finite Blade Functions for Horizontal-Axis Wind Turbines
Energies, 2021 This paper considers the effect of wake expansion on the finite blade functions in blade element/momentum theory for horizontal-axis wind turbines. For any velocity component, the function is the ratio of the streamtube average to that at the blade ...
David Wood
doaj +1 more source
Effects of end plates on performance of a small straight-bladed vertical axis wind turbine
Journal of Fluid Science and Technology, 2017 The time mean characteristics and the torque variation of the straight-bladed vertical axis wind turbine attached with various end plates were examined in wind tunnel experiments, and they were associated with the effect of the wing tip shape on the ...
Seiji YAMADA +2 more
doaj +1 more source