Simulation on flow control strategy of synthetic jet in an vertical axis wind turbine

Zhu, Hongni; Hao, Wenxing; Li, Chun; Ding, Qian

doi:10.1016/j.ast.2018.03.012

Cited by 67 publications

(16 citation statements)

References 12 publications

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“…The C shape together with a rectangular enclosure is used for the far field sub-domain. The C shape has 25 R in radius and the rectangular enclosure has 30 R in stream wise distance from the centre of the turbine rotating axis to the exit, as suggested by Zhu et al (2018). Figure 5a has shown this sub-domain is divided into six regions to facilitate smooth grid discretization.…”

Section: Methodsmentioning

confidence: 99%

Assessment of stress-blended eddy simulation model for accurate performance prediction of vertical axis wind turbine

Syawitri

Yao

et al. 2020

HFF

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Purpose The aim of this paper is to assess the ability of a stress-blended eddy simulation (SBES) turbulence model to predict the performance of a three-straight-bladed vertical axis wind turbine (VAWT). The grid sensitivity study is conducted to evaluate the simulation accuracy. Design/methodology/approach The unsteady Reynolds-averaged Navier–Stokes equations are solved using the computational fluid dynamics (CFD) technique. Two types of grid topology around the blades, namely, O-grid (OG) and C-grid (CG) types, are considered for grid sensitivity studies. Findings With regard to the power coefficient (Cp), simulation results have shown significant improvements of predictions using compared to other turbulence models such as the k-e model. The Cp distributions predicted by applying the CG mesh are in good agreement with the experimental data than that by the OG mesh. Research limitations/implications The current study provides some new insights of the use of SBES turbulence model in VAWT CFD simulations. Practical implications The SBES turbulence model can significantly improve the numerical accuracy on predicting the VAWT performance at a lower tip speed ratio (TSR), which other turbulence models cannot achieve. Furthermore, it has less computational demand for the finer grid resolution used in the RANS-Large Eddy Simulation (LES) “transition” zone compared to other hybrid RANS-LES models. Originality/value To authors’ knowledge, this is the first attempt to apply SBES turbulence model to predict VAWT performance resulting for accurate CFD results. The better prediction can increase the credibility of computational evaluation of a new or an improved configuration of VAWT.

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Section: Methodsmentioning

confidence: 99%

Assessment of stress-blended eddy simulation model for accurate performance prediction of vertical axis wind turbine

Syawitri

Yao

et al. 2020

HFF

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“…Active solutions like the synthetic air jet (Zhu et al, 2018), the boundary layer suction method (Rezaeiha et al, 2019), the plasma actuator (Greenblatt et al, 2014) or different kind of ribs (Heinzelmann, 2011) like the inflatable stall rib (Holzem, 1992) exist to improve the efficiency of wind turbines by manipulating the flow around the surface of a blade. Heinzelmann (2011) numerically studied several fixed rib geometries and positions.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on an airfoil equipped with an active flow control element

Hochhäusler

Erfort

2021

Wind Engineering

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This paper addresses the torque ripple problem of vertical axis wind turbines (VAWT) by applying an oscillating bump which was previously optimised with a numerical model. Since the element primarily affects the drag of an airfoil, a low-speed wind-tunnel experiment using the wake survey method was conducted in order to highlight the effect on the drag of a symmetrical airfoil. Measurements were taken along the centreline of the foil to compare with numerically simulated results on a 2D foil. This study provides an experimental data set for an active flow control device. When the stationary results were compared against numerical simulation they showed an overall good agreement. The moving bump increased the drag coefficient for higher frequencies of oscillation and induced less drag compared to the steady maximum distortion. Uncertainties in the experiments were primarily caused by fluctuations in the test section and the data reduction error. Future work should include the measurement of lift in order to determine the influence of the element on the torque.

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“…Wind energy is becoming a more and more popular energy source due to its main advantages such as renewability and eco-friendliness. Therefore, a vast amount of research on wind turbine, including both horizontal axis wind turbines (HAWTs) and vertical axis wind turbines (VAWTs), is springing up these years, especially for some hot topics such as airfoil design and optimization, 1,2 wind farm site selection, 3 noise, 4 flow control, 5 atmospheric effects, 6,7 etc. Among various atmospheric conditions, gust, which is easily generated by nearby buildings, trees, and terrains, is one of the major factors influencing wind turbine greatly.…”

Section: Introductionmentioning

confidence: 99%

Responses of vertical axis wind turbines to gusty winds

Wang

Bangga

2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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Gust is a common atmospheric condition encountered by wind turbines. Despite the presence of a vast amount of literature on this topic, few of them involve lateral gust influence. Due to this motivation, this paper presents an investigation on the effects of sinusoidal gusts on a three-bladed vertical axis wind turbine under varying gust parameters including gust direction, velocity amplitude, and frequency. The chimera mesh technique is used to model the real rotation of the rotor, as well as the resolved gust approach model in the DLR (German Aerospace Center) TAU code for gust simulation. Both the general aerodynamic computational fluid dynamics model and the gust model are validated before the following simulations. Numerous new flow phenomena and physics are revealed. The influences of gust on the rotor power output and flowfield characteristics are discussed and analyzed in detail. The findings in this study may be helpful for some practical wind engineering applications, such as atmospheric influence evaluation and field site selection.

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Simulation on flow control strategy of synthetic jet in an vertical axis wind turbine

Cited by 67 publications

References 12 publications

Assessment of stress-blended eddy simulation model for accurate performance prediction of vertical axis wind turbine

Assessment of stress-blended eddy simulation model for accurate performance prediction of vertical axis wind turbine

Experimental study on an airfoil equipped with an active flow control element

Responses of vertical axis wind turbines to gusty winds

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