Large-Eddy Simulations for Wind Turbine Blade: Dynamic Stall and Rotational Augmentation

Kim, Yusik; Castro, Ian P.; Xie, Zheng-Tong

doi:10.1007/978-3-319-14448-1_46

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…in Sec. 6.3 in [26], and [27]). Based on the static airfoil data, the resolution along the chordwise and wall-normal directions for case PC5 was nearly the same as that for the static case.…”

Section: Baseline Simulationsmentioning

confidence: 99%

Modelling the effect of freestream turbulence on dynamic stall of wind turbine blades

Kim

Xie

2016

Computers & Fluids

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Section: Baseline Simulationsmentioning

confidence: 99%

Modelling the effect of freestream turbulence on dynamic stall of wind turbine blades

Kim

Xie

2016

Computers & Fluids

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“…Large Eddy Simulation (LES) model was used to model the flow around NACA0015 airfoil to give the better agreement results with experimental data taken from [112] and [116]. According to the literature survey in [95,[117][118][119][120][121][122][123][124], LES model gave excellent results when they are used to simulate the airfoil in stall condition.…”

Section: Validation Of the Cfd Modelmentioning

confidence: 99%

Effect of passive flow control on the aerodynamic performance, entropy generation and aeroacoustic noise of axial turbines for wave energy extractor

et al. 2018

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Wells turbine is the simplest type of an axial flow self-rectifying air turbine that can be used in conjunction with Oscillating Water Column (OWC) system in the extraction of ocean wave energy. It has been noticed that this turbine is subjected to early stall. As a consequence, several attempts for improving the energy extraction performance of Wells turbine within the stall regime have been investigated. One of these attempts was using an inclined slot as a passive flow control to obtain a delayed stall. In the following study, the impact of varying the angle for the slot on the performance of Wells turbine in the stall regime was investigated. Furthermore, the first law of thermodynamics and the entropy analysis has been used to examine the effect of the slot angle on the entropy generation features around the turbine blade. Moreover, Investigation of slot angle effect on the aerodynamics noise emission from Wells turbine airfoil during the normal operation and the stall regime is covered in this study. The blade of turbine with optimum angle of slot was investigated using the OWC based on actual data from the Egyptian Northern Coast. It was found that the optimum slot angle is 10 degrees clockwise which results in 3% improvement in the torque coefficient before the stall and 15% after the stall as compared to the 0 degree slot. Otherwise, it gives a lower global entropy generation rate than the 0 degree slot by 4% before the stall and 3% after the stall. Furthermore, using airfoil of blade turbine with a slot resulted in a reduction of aeroacoustic noise by -21.2% at the stall regime under oscillating flow conditions.

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“…Large Eddy Simulation model was used to model the flow around NACA0015 airfoil in order to give the best agreement with experimental data adopted from [83,99] and [103]. The Large Eddy Simulation model gives excellent results when they are used to simulate the airfoil in stall condition, according to literature survey [70,100,[104][105][106][107][108][109][110].…”

Section: Les Resolution Quality Assessmentmentioning

confidence: 99%

Passive flow control for aerodynamic performance enhancement of airfoil with its application in Wells turbine – Under oscillating flow condition

et al. 2017

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In this work, the passive flow control method was applied to improve the performance of symmetrical airfoil section in the stall regime. In addition to the commonly used first law analysis, the present study utilized an entropy generation minimization method to examine the impact of the flow control method on the entropy generation characteristics around the turbine blade. This work is performed using a time-dependent CFD model of isolated NACA airfoil, which refers to the turbine blade, under sinusoidal flow boundary conditions, which emulates the actual operating conditions. Wells turbine is one of the most proper applications that can be applied by passive flow control method because it is subjected to early stall. Additionally, it consists of a number of blades that have a symmetrical airfoil section subject to the wave condition. It is deduced that with the use of passive flow control, torque coefficient of blade increases by more than 40% within stall regime and by more than 17% before the stall happens. A significantly delayed stall is also observed.

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Large-Eddy Simulations for Wind Turbine Blade: Dynamic Stall and Rotational Augmentation

Cited by 4 publications

References 10 publications

Modelling the effect of freestream turbulence on dynamic stall of wind turbine blades

Modelling the effect of freestream turbulence on dynamic stall of wind turbine blades

Effect of passive flow control on the aerodynamic performance, entropy generation and aeroacoustic noise of axial turbines for wave energy extractor

Passive flow control for aerodynamic performance enhancement of airfoil with its application in Wells turbine – Under oscillating flow condition

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