Investigation of the Rotor Wake of Horizontal Axis Wind Turbine under
                        Yawed Condition

Noura, Belkheir; Dobrev, Ivan; Kerfah, Rabah; Massouh, Fawaz; Khelladi, Sofiane

doi:10.29252/jafm.09.06.25908

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…The turbulence model used with IDDES is the SST due to pressure gradient adaptability and flow separation predictability with compared to the other two-equation models. The complete transport equations for SST-IDDES model are given by Noura et al 20…”

Section: Methodsmentioning

confidence: 99%

Investigation of effects of tire contour on aerodynamic characteristics and its optimization

Zhang

Zhou

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Reducing the aerodynamic drag is one of the most important approaches for the development of energy-saving and environment-friendly automobiles. The tire contour has a great influence on the aerodynamic characteristics of automobiles. The aim of this study is to investigate the influence of the tire contour design parameters on the aerodynamic characteristics around a closed wheel, and obtain the optimized tire contour to reduce the automobile aerodynamic drag. A passenger car tire 185/65R14 was selected to conduct the wind tunnel test, and the surface pressure coefficients were used to validate the simulation model established using the detached eddy simulation (DES) model. To decrease tire drag, and taking the upper sidewall height, the tread radii, the tread width, and the transition arc radius of the shoulder as four design variables of contour, a combination of the Latin hypercube experimental design, the Kriging surrogate model, and the adaptive simulated annealing (ASA) algorithm were used to optimize the tire contour design parameters. The changes of flow field around the tire, including the velocity, turbulent kinetic energy, and pressure field were compared and analyzed for further understanding of the drag reduction mechanism. It is found that the aerodynamic drag coefficient of the optimized tire is reduced by 14.5%, and the aerodynamic coefficient drag of the car using the optimized tire is reduced by 7%. The present results are expected to provide useful information for designing new tire structures and improving the aerodynamic performance of the automobile.

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Section: Methodsmentioning

confidence: 99%

Investigation of effects of tire contour on aerodynamic characteristics and its optimization

Zhang

Zhou

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

“…Offset yaw angles have been studied to test potential increases to downstream wind turbines. It is interesting that for wind farms with an array of turbines, Miao, Li [9] , Noura, Dobrev [10] and Xinghui Dong and Hui Wang [11] found purposely angling upstream wind turbines can increase the overall power yield. Tip speed ratio (λ), which is defined as the ratio of wind turbine blade tip velocity to the wind speed, is a crucial value when wind turbine design is considered.…”

Section: Introductionmentioning

confidence: 99%

Effect of Yaw Angle on Large Scale Three-blade Horizontal Axis Wind Turbines

Zhao¹,

Posenauer²,

Tan³

2022

Hydro. sci. & mar. eng.

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Offshore Horizontal Axis Wind Turbines (HAWT) are used globally as a source of clean and renewable energy. Turbine efficiency can be improved by optimizing the geometry of the turbine blades. Turbines are generally designed in a way that its orientation is adjustable to ensure the wind direction is aligned with the axis of the turbine shaft. The deflection angle from this position is defined as yaw angle of the turbine. Understanding the effects of the yaw angle on the wind turbine performance is important for the turbine safety and performance analysis. In this study, performance of a yawed HAWT is studied by computational fluid dynamics. The wind flow around the turbine is simulated by solving the Reynolds-Averaged Navier-Stokes equations using software ANSYS Fluent. The principal aim of this study is to quantify the yaw angle on the efficiency of the turbine and to check the accuracy of existing empirical formula. A three-bladed 100-m diameter prototype HAWT was analysed through comprehensive Computational Fluid Dynamics (CFD) simulations. The turbine efficiency reaches its maximum value of 33.9% at 0° yaw angle and decreases with the increase of yaw angle. It was proved that the cosine law can estimate the turbine efficiency with a yaw angle with an error less 10% when the yaw angle is between –30° and 30°. The relative error of the cosine law increase at larger yaw angles because of the power is reduced significantly.

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“…The results of large eddy simulation showed that the dimensionless mean velocity and Reynolds stress curves in the wake of HAWT show selfsimilarity through an appropriate choice of characteristic scales of velocity and length. In recent years, numerous efforts have been spent on the wake characteristics and the establishment of wake models for HAWTs (Noura et al 2016;Belkheir et al 2012;Dahmouni et al 2017;Kabir et al 2019;Qian et al 2022). However, the research on the wake characteristics of VAWT is not as extensive as that of HAWTs (Paraschivoiu 2002).…”

Section: Introductionmentioning

confidence: 99%

Self-similarity Characteristics of Vertical Axis Wind Turbine Wakes

2022

JAFM

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Wake generated by wind turbine can greatly influence the performance of downstream turbine. To better understand the wake self-similarity characteristics of vertical axis wind turbine (VAWT), the shear stress transport (SST) turbulence model with the addition of the γ-Reθ transition model is performed to model a twoblade VAWT at different operating conditions. The simulated blade surface pressure and torque are compared with existing experimental results for validation. Results show that, the simulated results after considering the transition model are more consistent with the experimental results. Analysis of the flow field shows that the average streamwise velocity of the wake in the horizontal plane under different tip speed ratios is asymmetry, but symmetric in the vertical plane. Further analysis indicates that, at different downstream positions, the nondimensional streamwise velocity deficit in the vertical plane remains self-similarity and basically coincides with the Gaussian distribution curve exclude the wake edges. In addition, the larger the tip speed ratio, the easier streamwise velocity deficit reach self-similarity state at downstream of the VAWT. The results of this study will be helpful to establish the wake model of the VAWT.

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Investigation of the Rotor Wake of Horizontal Axis Wind Turbine under Yawed Condition

Cited by 7 publications

References 8 publications

Investigation of effects of tire contour on aerodynamic characteristics and its optimization

Investigation of effects of tire contour on aerodynamic characteristics and its optimization

Effect of Yaw Angle on Large Scale Three-blade Horizontal Axis Wind Turbines

Self-similarity Characteristics of Vertical Axis Wind Turbine Wakes

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