Entropy analysis of pitching airfoil for offshore wind turbines in the dynamic stall condition

Mamouri, Amir Reza; Lakzian, Esmail; Khoshnevis, Abdolamir Bak

doi:10.1016/j.oceaneng.2019.106229

Cited by 31 publications

(8 citation statements)

References 52 publications

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“…Although large eddy simulation (LES) and detached eddy simulation (DES) can show more detailed flow structures, they require considerable computational resources and are time-consuming and costly. However, for research on engineering applications, the unsteady Reynolds-averaged Navier-Stokes (URANS) method is also feasible for reliable aerodynamic forces and average flow fields [33]. In previous studies [34,35], the URANS method and different turbulence models were used for similar research geometry, such as shear stress transport (SST) k-ω turbulence models, renormalisation group (RNG) k-ε turbulence, the realisable k-ε turbulence model, etc.…”

Section: Methodsmentioning

confidence: 99%

Unsteady Aerodynamic Characteristics of a High-Speed Train Induced by the Sudden Change of Windbreak Wall Structure: A Case Study of the Xinjiang Railway

et al. 2022

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Under strong winds, the effect of sudden windbreak transition (WT) on high-speed trains is severe, leading to a deterioration of train aerodynamics and sudden yawing motion of the car body. To address these problems, based on a high-speed train and the specific geometric conditions derived from Xinjiang railway, first, the impact of a WT on the train and reasons for sudden changes in aerodynamic forces were determined by flow structural analysis. Furthermore, based on a multibody system dynamic model, the dynamic responses to WT were analysed. The results show that the impacts of WT were the strongest on the head car. WT had a strong effect on the train due to the unreasonable structural shape and the insufficient height of the windbreak in the transition region. This led to a strong push effect on the train; subsequently, the train’s dynamic characteristics deteriorated.

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Section: Methodsmentioning

confidence: 99%

Unsteady Aerodynamic Characteristics of a High-Speed Train Induced by the Sudden Change of Windbreak Wall Structure: A Case Study of the Xinjiang Railway

et al. 2022

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“…Mamouri et al [ 8 ] focused on dynamic stall in offshore wind turbine blades and used the entropy generation rate as a tool for analysis and design, showing that some airfoils have a lower drag coefficient. In another work, Mamouri et al [ 9 ] examined the entropy generation of three offshore wind turbine airfoils at various angles of attack, revealing that flow separation has a large impact on the viscous entropy generation rate and that the SD7062 airfoil has the lowest entropy generation rate at large angles of attack.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Experimental Investigation of 3D Printed Micro Wind Turbine Blade Made of PLA Material

Arivalagan¹,

Rajakumar

Čep

et al. 2023

Materials

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This paper presents the design, development, and optimization of a 3D printed micro horizontal axis wind turbine blade made of PLA material. The objective of the study was to produce 100 watts of power for low-wind-speed applications. The design process involved the selection of SD7080 airfoil and the determination of the material properties of PLA and ABS. A structural analysis of the blade was carried out using ANSYS software under different wind speeds, and Taguchi’s L16 orthogonal array was used for the experiments. The deformation and equivalent stress of the PLA material were identified, and the infill percentage and wind speed velocity were optimized using the moth-flame optimization (MFO) algorithm. The results demonstrate that PLA material has better structural characteristics compared to ABS material. The optimized parameters were used to fabricate the turbine blades using the fusion deposition modeling (FDM) technique, and they were tested in a wind tunnel.

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“…They found that geometric nonlinearity had a significant effect on the stall flutter characteristics. Mamouri et al (16) simulated an airfoil oscillating with different frequencies to observe dynamic stall. They found that high entropy was generated by the airfoil, which decreased its efficiency.…”

Section: Introductionmentioning

confidence: 99%

Influence of Oscillation Frequency and Nonlinear Structural Material of Airfoil in Wind Turbine System During Dynamic Stall

Wang¹,

Mishra²

2021

Sensors and Materials

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We study the nonlinear behavior of a wind turbine airfoil oscillating along the pitch mode of oscillation. In the analysis, the nonlinearity of the structural material, the airspeed, and the reduced frequency of oscillation are the important parameters considered. The equation of motion for the pitching oscillation case is modeled and derived using the Office National d'Etudes et de Recherches Aérospatiales (ONERA) dynamic stall model. In the ONERA dynamic stall model, the aerodynamic loads are given in terms of differential equations. We focus on the influence of the material structural nonlinearity and nondimensional airspeed on the wind turbine airfoil during the pitch mode of oscillation. The type of airfoil considered is the National Advisory Committee for Aeronautics (NACA) 0012 airfoil. To understand the effects of dynamic stall on the system under different situations of structural nonlinearity, we use bifurcation plots, phase plots, Poincaré maps, and the maximum Lyapunov exponent (MLE) to analyze the behavior of the airfoil and avoid the effect of non-periodic motion of the airfoil on the wind turbine system. The results show that chaos occurs for specific parameters of the airfoil of the wind turbine, which can be avoided by avoiding certain operating conditions corresponding to chaotic motion. This finding can be used as a guideline for wind turbine design and decrease the cost of maintenance.

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Entropy analysis of pitching airfoil for offshore wind turbines in the dynamic stall condition

Cited by 31 publications

References 52 publications

Unsteady Aerodynamic Characteristics of a High-Speed Train Induced by the Sudden Change of Windbreak Wall Structure: A Case Study of the Xinjiang Railway

Unsteady Aerodynamic Characteristics of a High-Speed Train Induced by the Sudden Change of Windbreak Wall Structure: A Case Study of the Xinjiang Railway

Optimization and Experimental Investigation of 3D Printed Micro Wind Turbine Blade Made of PLA Material

Influence of Oscillation Frequency and Nonlinear Structural Material of Airfoil in Wind Turbine System During Dynamic Stall

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