Aerodynamic investigation of winglets on wind turbine blades using CFD

Jeppe Johansen; Niels N. Sørensen

Aerodynamic investigation of winglets on wind turbine blades using CFD

Jeppe Johansen
, Niels N. Sørensen

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Abstract

The present report describes the numerical investigation of the aerodynamics around a wind turbine blade with a winglet using Computational Fluid Dynamics, CFD.
Five winglets were investigated with different twist distribution and camber. Four of them were pointing towards the pressure side (upstream) and one was pointing towards the suction side (downstream). Additionally, a rectangular modification of the original blade tip was designed with the same planform area as the blades with winglets.
Results show that adding a winglet to the existing blade increase the force distribution on the outer approx 14 % of the blade leading to increased produced power of around 0.6% to 1.4% for wind speeds larger than 6 m/s. This has to be compared to the increase in thrust of around 1.0% to 1.6%. Pointing the winglet downstream increases the power production even further.
The effect of sweep and cant angles is not accounted for in the present investigation and could improve the winglets even more.

Original language	English

Number of pages	18
ISBN (Print)	87-550-3497-7
Publication status	Published - 2006

Series	Denmark. Forskningscenter Risoe. Risoe-R
Number	1543(EN)
ISSN	0106-2840

Bibliographical note

ISSN 0106-2840

Keywords

Risø-R-1543
Risø-R-1543(EN)

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Ris r 1543Final published version, 361 KB

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title = "Aerodynamic investigation of winglets on wind turbine blades using CFD",

abstract = "The present report describes the numerical investigation of the aerodynamics around a wind turbine blade with a winglet using Computational Fluid Dynamics, CFD. Five winglets were investigated with different twist distribution and camber. Four of them were pointing towards the pressure side (upstream) and one was pointing towards the suction side (downstream). Additionally, a rectangular modification of the original blade tip was designed with the same planform area as the blades with winglets. Results show that adding a winglet to the existing blade increase the force distribution on the outer approx 14 \% of the blade leading to increased produced power of around 0.6\% to 1.4\% for wind speeds larger than 6 m/s. This has to be compared to the increase in thrust of around 1.0\% to 1.6\%. Pointing the winglet downstream increases the power production even further. The effect of sweep and cant angles is not accounted for in the present investigation and could improve the winglets even more.",

keywords = "Vindenergi, Ris{\o}-R-1543, Ris{\o}-R-1543(EN)",

author = "Jeppe Johansen and S{\o}rensen, \{Niels N.\}",

note = "ISSN 0106-2840",

year = "2006",

language = "English",

isbn = "87-550-3497-7",

series = "Denmark. Forskningscenter Risoe. Risoe-R",

number = "1543(EN)",

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TY - RPRT

T1 - Aerodynamic investigation of winglets on wind turbine blades using CFD

AU - Johansen, Jeppe

AU - Sørensen, Niels N.

N1 - ISSN 0106-2840

PY - 2006

Y1 - 2006

N2 - The present report describes the numerical investigation of the aerodynamics around a wind turbine blade with a winglet using Computational Fluid Dynamics, CFD. Five winglets were investigated with different twist distribution and camber. Four of them were pointing towards the pressure side (upstream) and one was pointing towards the suction side (downstream). Additionally, a rectangular modification of the original blade tip was designed with the same planform area as the blades with winglets. Results show that adding a winglet to the existing blade increase the force distribution on the outer approx 14 % of the blade leading to increased produced power of around 0.6% to 1.4% for wind speeds larger than 6 m/s. This has to be compared to the increase in thrust of around 1.0% to 1.6%. Pointing the winglet downstream increases the power production even further. The effect of sweep and cant angles is not accounted for in the present investigation and could improve the winglets even more.

AB - The present report describes the numerical investigation of the aerodynamics around a wind turbine blade with a winglet using Computational Fluid Dynamics, CFD. Five winglets were investigated with different twist distribution and camber. Four of them were pointing towards the pressure side (upstream) and one was pointing towards the suction side (downstream). Additionally, a rectangular modification of the original blade tip was designed with the same planform area as the blades with winglets. Results show that adding a winglet to the existing blade increase the force distribution on the outer approx 14 % of the blade leading to increased produced power of around 0.6% to 1.4% for wind speeds larger than 6 m/s. This has to be compared to the increase in thrust of around 1.0% to 1.6%. Pointing the winglet downstream increases the power production even further. The effect of sweep and cant angles is not accounted for in the present investigation and could improve the winglets even more.

KW - Vindenergi

KW - Risø-R-1543

KW - Risø-R-1543(EN)

M3 - Report

SN - 87-550-3497-7

T3 - Denmark. Forskningscenter Risoe. Risoe-R

BT - Aerodynamic investigation of winglets on wind turbine blades using CFD

ER -

Aerodynamic investigation of winglets on wind turbine blades using CFD

Abstract

Bibliographical note

Keywords

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