Wind turbines based on condor wings could capture more energy

[mahatmakanejeeves]

4. Adding Winglets On Wind Turbine Blades: Worth The Retrofit Costs? September 14, 2020

i cant believe it took this long.

It didn't.

https://www.google.com/search?q=wind+turbine+blades+curved+tip

Adding Winglets On Wind Turbine Blades: Worth The Retrofit Costs?
September 14, 2020



Should wind farm operators install winglets on wind turbine blades? Is this a worthwhile retrofit to improve efficiency and power output? In this article, we’ll discuss the aerodynamic properties of wind turbine blades and whether or not winglets make financial sense as an upgrade on wind farms.

First: What Is a Wind Turbine Winglet?

Winglets are curvatures in the tip of a wing or blade. The vast majority of wind turbine blades feature straight blade tips, but as engineers look for more ways to improve efficiency, factories are beginning to produce turbine blades with winglets. Additionally, some wind farm operators who already have a straight-blade turbines are hiring maintenance companies to retrofit winglets onto their existing machines.



TraceyR / CC BY-SA (https://creativecommons.org/licenses/by-sa/3.0)

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Articles
Volume 7, issue 4
WES, 7, 1471–1501, 2022

https://doi.org/10.5194/wes-7-1471-2022
© Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License.
Research article | 18 Jul 2022



CFD-based curved tip shape design for wind turbine blades
Mads H. Aa. Madsen, Frederik Zahle, Sergio González Horcas, Thanasis K. Barlas, and Niels N. Sørensen

Abstract
This work presents a high-fidelity shape optimization framework based on computational fluid dynamics (CFD). The presented work is the first comprehensive curved tip shape study of a wind turbine rotor to date using a direct CFD-based approach. Preceding the study is a thorough literature survey particularly focused on wind turbine blade tips in order to place the present work in its context. Then follows a comprehensive analysis to quantify mesh dependency and to present needed mesh modifications ensuring a deep convergence of the flow field at each design iteration.

The presented modifications allow the framework to produce up to six-digit-accurate finite difference gradients which are verified using the machine-accurate Complex-Step method. The accurate gradients result in a tightly converged design optimization problem in which the studied problem is to maximize power using 12 design variables while satisfying constraints on geometry, as well as on the bending moment at 90 % blade length.

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Wind Turbine Blade-Tip Optimization: A Systemic Computational Approach
by Panagiotis Zouboulis 1,Elias P. Koumoulos 2ORCID andAnna Karatza 1,*ORCID
1 BIOG3D P.C., Technological & Cultural Park of Lavrion, 1 Lavriou Ave., 19500 Lavrion, Greece
2 IRES—Innovation in Research and Engineering Solutions, Rue Koningin Astridlaan 59B, 1780 Wemmel, Belgium
* Author to whom correspondence should be addressed.
Processes 2023, 11(4), 1170; https://doi.org/10.3390/pr11041170
Submission received: 6 March 2023 / Revised: 28 March 2023 / Accepted: 5 April 2023 / Published: 11 April 2023
(This article belongs to the Special Issue New Advancement of Computational Fluid Dynamics Modeling on Sustainable Renewable Energy Applications)

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