Interaction between free-stream turbulence and tip-vortices of wind turbine blades with and without winglets

Name: Interaction between free-stream turbulence and tip-vortices of wind turbine blades with and without winglets
Author: Al-Abadi, A., Kim, Y., Ertunç, Özgür, Epple, P., Delgado, A.

İsim	Interaction between free-stream turbulence and tip-vortices of wind turbine blades with and without winglets
Yazar	Al-Abadi, A., Kim, Y., Ertunç, Özgür, Epple, P., Delgado, A.
Basım Tarihi:	2018
Basım Yeri	- IOP Publishing
Tür	Belge
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	1742-6588
Kayıt Numarası	dec00582-6980-4e4a-adca-6f373ab70042
Lokasyon	Mechanical Engineering
Tarih	2018
Örnek Metin	Experimental investigations of the free-stream turbulence impact on the tip-vortices generated in wind turbine blades have been performed. The investigation is done by exposing an efficient laboratory scale wind turbine to different turbulence levels generated by two static grids installed in the cross section of a wind tunnel. Different winglet configurations to figure out the optimum design that can prevent the tip induced flow are studied. The power gained when adding different winglets is measured when exposing the turbine to turbulence. It is found that the strength of the vortices is reduced depending on the turbulence levels. Furthermore, higher power extraction associated with more expansion of wake and wake-border is shown. This is an indication for increasing of the mixing between the free-stream and the wake. Tip-vortex analysis of high turbulence levels has shown additional interaction of large-eddy scales contained in the free-stream turbulence. The turbulence helps to suppress the tip vortices, and thus, reduces the tip losses. Further investigations of the near and far wake-surrounding intersection are performed to understand the energy exchange and the free stream entrainment that help in wake recovery.
DOI	10.1088/1742-6596/1037/7/072025
Cilt	1037

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Özyeğin Üniversitesi

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Interaction between free-stream turbulence and tip-vortices of wind turbine blades with and without winglets

Yazar Al-Abadi, A., Kim, Y., Ertunç, Özgür, Epple, P., Delgado, A.

Basım Tarihi 2018

Basım Yeri - IOP Publishing

Tür Belge

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 1742-6588

Kayıt Numarası dec00582-6980-4e4a-adca-6f373ab70042

Lokasyon Mechanical Engineering

Tarih 2018

Örnek Metin Experimental investigations of the free-stream turbulence impact on the tip-vortices generated in wind turbine blades have been performed. The investigation is done by exposing an efficient laboratory scale wind turbine to different turbulence levels generated by two static grids installed in the cross section of a wind tunnel. Different winglet configurations to figure out the optimum design that can prevent the tip induced flow are studied. The power gained when adding different winglets is measured when exposing the turbine to turbulence. It is found that the strength of the vortices is reduced depending on the turbulence levels. Furthermore, higher power extraction associated with more expansion of wake and wake-border is shown. This is an indication for increasing of the mixing between the free-stream and the wake. Tip-vortex analysis of high turbulence levels has shown additional interaction of large-eddy scales contained in the free-stream turbulence. The turbulence helps to suppress the tip vortices, and thus, reduces the tip losses. Further investigations of the near and far wake-surrounding intersection are performed to understand the energy exchange and the free stream entrainment that help in wake recovery.

DOI 10.1088/1742-6596/1037/7/072025

Cilt 1037