Parametric Study of a Gurney Flap Implementation in a DU91W(2)250 Airfoil

Aramendia, Iñigo; Fernandez-Gamiz, Unai; Zulueta, Ekaitz; Saenz‐Aguirre, Aitor; Teso-Fz-Betoño, Daniel

doi:10.3390/en12020294

Cited by 33 publications

(29 citation statements)

References 35 publications

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“…In the energy field, we find the works of Aramendia, which analyzed the effect of Gurney flap (GF) length on the lift/drag ratio C L /C D of blades. They have proved numerically the capability of the GF to improve lift/drag ratio of passive and active flow control [2,3].…”

Section: Introductionmentioning

confidence: 97%

Morphing Hydrofoil Model Driven by Compliant Composite Structure and Internal Pressure

Arab

Augier

Deniset

et al. 2019

JMSE

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In this work, a collaborative experimental study has been conducted to assess the effect an imposed internal pressure has on the controlling the hydrodynamic performance of a compliant composite hydrofoil. It was expected that the internal pressure together with composite structures be suitable to control the hydrodynamic forces as well as cavitation inception and development.A new concept of morphing hydrofoil was developed and tested in the cavitation tunnel at the French Naval Academy Research Institute. The experiments were based on the measurements of hydrodynamic forces and hydrofoil deformations under various conditions of internal pressure. The effect on cavitation inception was studied too. In parallel to this experiment, a 2D numerical tool was developed in order to assist the design of the compliant hydrofoil shape. Numerically, the fluid-structure coupling is based on an iterative method under a small perturbation hypothesis. The flow model is based on a panel method and a boundary layer formulation and was coupled with a finite-element method for the structure. It is shown that pressure driven compliant composite structure is suitable to some extent to control the hydrodynamic forces, allowing the operational domain of the compliant hydrofoil to be extended according to the angle of attack and the internal pressure. In addition, the effect on the cavitation inception is pointed out.

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Section: Introductionmentioning

confidence: 97%

Morphing Hydrofoil Model Driven by Compliant Composite Structure and Internal Pressure

Arab

Augier

Deniset

et al. 2019

JMSE

View full text Add to dashboard Cite

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“…A modification of the Kernel regression method is proposed for dealing with this kind of problems. Sideways, vortex generators, and more in general aerodynamic retrofitting of wind turbine blades, is one of the most important strategies for improving the power capture: see for example [30][31][32][33][34][35][36][37][38][39]. The impact of vortex generators installation on wind turbine power production is addressed also in [40]: in that work, the same Kernel method of [19] is adopted using ordinary wind turbine operation data (with, in general, sampling time of some minutes).…”

Section: Introductionmentioning

confidence: 99%

Wind Turbine Yaw Control Optimization and Its Impact on Performance

2019

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The optimization of wind energy conversion efficiency has been recently boosting the technology improvement and the scientific comprehension of wind turbines. In this context, the yawing behavior of wind turbines has become a key topic: the yaw control can actually be exploited for optimization at the level of single wind turbine and of wind farm (for example, through active control of wakes). On these grounds, this work is devoted to the study of the yaw control optimization on a 2 MW wind turbine. The upgrade is estimated by analysing the difference between the measured post-upgrade power and a data driven model of the power according to the pre-upgrade behavior. Particular attention has therefore been devoted to the formulation of a reliable model for the pre-upgrade power of the wind turbine of interest, as a function of the operation variables of all the nearby wind turbines in the wind farm: the high correlation between the possible covariates of the model indicates that Principal Component Regression (PCR) is an adequate choice. Using this method, the obtained result for the selected test case is that the yaw control optimization provides a 1% of annual energy production improvement. This result indicates that wind turbine control optimization can non-negligibly improve the efficiency of wind turbine technology.

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“…Its brim makes significant use of viscous flow effects, exploiting strong vortex shedding ( Figure 1) to create suction in the wake. Although some researches on wind turbine performances have addressed the effective use of vortices [14][15][16][17], our concept is different; the WLT actively uses vortices to collect wind more and enhances its power in our research. Abe et al have investigated flow fields behind WLTs precisely [18].…”

Section: Introductionmentioning

confidence: 99%

Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct

2019

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A brimmed-diffuser augmented turbine (called a wind lens turbine: WLT) actively uses vortices around the brim to enhance its power output. However, the vortices are usually unstable and asymmetric. This study attempted to stabilize the vortices to enhance the power output of a WLT. Then, we investigated new approaches using vortex stabilization plates and polygonal brims in wind tunnel experiments and numerical simulations. Both approaches achieved a 1.5–3.8% increase in power output compared with a standard WLT. Our numerical simulations revealed a periodicity existing in a fluctuating vortex structure on the circular brim. Importantly, vortex stabilization plates and polygonal brims must be the same periodic scale to suppress the vortex fluctuation and stabilize the vortices effectively. In addition, a larger brim tended to enhance the stabilizing effects. We believe that this discovery provides an easy way to increase the power output of existing wind turbines. It is particularly important in light of advances in wind energy technology and the increasing wind energy market.

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Parametric Study of a Gurney Flap Implementation in a DU91W(2)250 Airfoil

Cited by 33 publications

References 35 publications

Morphing Hydrofoil Model Driven by Compliant Composite Structure and Internal Pressure

Morphing Hydrofoil Model Driven by Compliant Composite Structure and Internal Pressure

Wind Turbine Yaw Control Optimization and Its Impact on Performance

Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct

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