Low-order modeling of dynamic stall in vertical-axis wind turbines

2019 ◽  
Author(s):  
Arun Vishnu Suresh Babu ◽  
Ashok Gopalarathnam
Keyword(s):  
Wind Turbines ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Vertical Axis Wind Turbines ◽  
Low Order

scholarly journals Critical Analysis of Dynamic Stall Models in Low-Order Simulation Models For Vertical-Axis Wind Turbines

2016 ◽  
Vol 101 ◽  
pp. 488-495 ◽  
Author(s):  
Alessandro Bianchini ◽  
Francesco Balduzzi ◽  
Giovanni Ferrara ◽  
Lorenzo Ferrari
Keyword(s):  
Wind Turbines ◽  
Critical Analysis ◽  
Simulation Models ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Vertical Axis Wind Turbines ◽  
Low Order

Dynamic Stall Modeling for the Conditions of Vertical Axis Wind Turbines

AIAA Journal ◽  
2014 ◽  
Vol 52 (1) ◽  
pp. 72-81 ◽  
Author(s):  
Eduard Dyachuk ◽  
Anders Goude ◽  
Hans Bernhoff
Keyword(s):  
Wind Turbines ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Vertical Axis Wind Turbines

Aerodynamic Factors Affecting Performance of Straight-Bladed Vertical Axis Wind Turbines

2007 ◽  
Author(s):  
Mazharul Islam ◽  
M. Ruhul Amin ◽  
David S.-K. Ting ◽  
Amir Fartaj
Keyword(s):  
Experimental Data ◽  
Wind Turbines ◽  
Angle Of Attack ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Factors Affecting ◽  
Vertical Axis Wind Turbines ◽  
Wide Range ◽  
Flow Curvature ◽  
Factors Affecting Performance

Unlike the conventional aerodynamic applications, the straight-bladed vertical axis wind turbines (VAWTs) operate in a circular motion and encounter a wide range of angle of attacks, especially at low tip speed ratios. When the blade angle of attack remains constant or varies slowly with time, it encounters the static stall. However, when the angle of attack changes rapidly with time, it experiences the dynamic stall which is far more difficult to analyze and predict than the static stall. Furthermore, the blade/blade wake interaction in straight-bladed VAWTs also presents modeling problem. In this paper, all of these aforesaid aerodynamic factors are discussed. It was found that these factors need special attention for designing a self-starting straight-bladed VAWT with optimum performance. A numerical method based on Cascade model, proposed by Hirsch and Mandal [1], that gives reasonable correlation with the experimental data available has been used. The effects of dynamic stall and flow curvature on the performance of a straight-bladed VAWT have been analyzed. It is observed from the analysis that aerodynamic forces due to dynamic stall are higher than those due to static stall. As a result, for the performance prediction of straight-bladed VAWTs, especially for the local forces, there can be substantial differences between the experimental data and the calculated values unless the dynamic stall effect is added.

A Robust Procedure to Implement Dynamic Stall Models Into Actuator Line Methods for the Simulation of Vertical-Axis Wind Turbines

2021 ◽  
Author(s):  
Pier Francesco Melani ◽  
Francesco Balduzzi ◽  
Alessandro Bianchini
Keyword(s):  
Flow Field ◽  
Wind Turbines ◽  
Signal To Noise Ratio ◽  
Angle Of Attack ◽  
Computational Cost ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Vertical Axis Wind Turbines ◽  
Lumped Parameter ◽  
Low Pass

Abstract The Actuator Line Method (ALM), combining a lumped-parameter representation of the rotating blades with the CFD resolution of the turbine flow field, stands out among the modern simulation methods for Vertical-Axis Wind Turbines (VAWTs) as probably the most interesting compromise between accuracy and computational cost. Being however a method relying on tabulated coefficients for modeling the blade-flow interaction, the correct implementation of the sub-models to account for higher order aerodynamic effects is pivotal. Inter alia, the introduction of a dynamic stall model is extremely challenging. As a matter of fact, two main issues arise: first, it is important to extrapolate a correct value of the angle of attack (AoA) from the CFD solved flow field; second, the AoA history required as an input to calculate the rate of dynamic variation of the angle itself is characterized by a low signal-to-noise ratio, leading to severe numerical oscillations of the solution. In the study, a robust procedure to improve the quality of the AoA signal extracted from an ALM simulation is introduced. The procedure combines a novel method for sampling of the inflow velocity from the numerical flow field with a low-pass filtering of the corresponding angle of attack signal based on Cubic Spline Smoothing (CSS). Such procedure has been implemented in the Actuator Line module developed by the authors for the commercial ANSYS® FLUENT® solver. In order to verify the reliability of the proposed methodology, two-dimensional unsteady RANS simulations of a test 2-blade Darrieus H-rotor, for which high-fidelity experimental and numerical blade loading data were available, have been eventually performed for a selected turbine unstable operation point.

Engineering and Economic Models of Vertical Axis Wind Turbines

2017 ◽  
Author(s):  
Elhadji Alpha A. Bah ◽  
Lakshmi N. Sankar ◽  
Jechiel I. Jagoda
Keyword(s):  
Wind Turbines ◽  
Fossil Fuels ◽  
Fossil Fuel ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Economic Viability ◽  
Vertical Axis Wind Turbines ◽  
Many Sources ◽  
A Site ◽  
Fossil Fuel Emissions

The interest in sustainable forms of energy is being driven by the anticipated scarcity of traditional fossil fuels over the coming decades. There is also a growing concern about the effects of fossil fuel emissions on human health and the environment. Many sources of renewable energy are being researched and implemented for power production. In particular, wind power generation by vertical-axis wind turbines is one of the option often considered. This option offers a robust design because of the relative simplicity of its technology. However, it also presents challenges that are inherent to its very concept. These systems suffer from dynamic stall, noticeably one of the main causes of the loss of performance. A dual-element concept is proposed as a way of alleviating the losses due to the dynamic stall. An economic analysis is done to establish the economic viability of the model. The Great Coast of Senegal is selected as a site of operation in this study.

scholarly journals Dynamics of Vertical Axis Wind Turbines (Darrieus Type)

1995 ◽  
Vol 2 (1) ◽  
pp. 33-41 ◽  
Author(s):  
A. F. Abdel Azim El-Sayed ◽  
C. Hirsch ◽  
R. Derdelinckx
Keyword(s):  
Finite Element ◽  
The Netherlands ◽  
Dynamic Response ◽  
Wind Turbines ◽  
Finite Element Methods ◽  
Reasonable Agreement ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Vertical Axis Wind Turbines ◽  
Resonance Frequencies

A computing package that combines finite element methods for evaluating the resonance frequencies and modes of turbine subcomponents (blade, tower and shaft) together with the aerodynamic calculations for forces and moments taking into consideration the dynamic stall as well as the dynamic response is developed. This method was applied to a realistic VAWT; namely; the PIONEER I built in the Netherlands by Fokker company. A reasonable agreement between the calculated and field results was predicted.

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