Effects of blade tapering on the performance of vertical axis wind turbines analysed through advanced visualization techniques

Martin Zahariev, Taimoor Asim, Rakesh Mishra, Blaise Nsom

Research output: Contribution to journalArticle

Abstract

Harnessing the wind energy effectively and efficiently, to fulfil the ever increasing energy demands, has long been an area of active research. This research study is aimed at exploring the blade design of a small-to-medium sized Savonius type Vertical Axis Wind Turbine (VAWT) for urban applications, as the published research in this area is severely limited. A commercial Computational Fluid Dynamics (CFD) based solver has been used to numerically simulate airflow around a conventional (cup-shaped) 2-bladed VAWT over a wide operational range (i.e. Tip Speed Ratio (TSR) from 0.4-1) in order to identify the peak performance point. Blade tapering has been shown to affect the performance of a wind turbine. As such, in the present study, three different VAWT configurations have been used with blade tapering corresponding to Delta, Rhomb and Cross shaped blades. It has been observed that tapering the blades of a Savonius VAWT significantly reduces the torque coefficient of the turbine, while there is a slight decrease in the power coefficient. Comparing the three tapered blade configurations, the delta blades depict higher performance than the competitor designs.
Original languageEnglish
Pages (from-to)69-74
Number of pages6
JournalInternational Journal of COMADEM
Volume22
Issue number2
Publication statusPublished - 2 Aug 2019

Fingerprint

Wind turbines
Turbomachine blades
Visualization
Wind power
Computational fluid dynamics
Turbines
Torque
Coefficients

Cite this

@article{375507eaea0d45379f1568853e0605de,
title = "Effects of blade tapering on the performance of vertical axis wind turbines analysed through advanced visualization techniques",
abstract = "Harnessing the wind energy effectively and efficiently, to fulfil the ever increasing energy demands, has long been an area of active research. This research study is aimed at exploring the blade design of a small-to-medium sized Savonius type Vertical Axis Wind Turbine (VAWT) for urban applications, as the published research in this area is severely limited. A commercial Computational Fluid Dynamics (CFD) based solver has been used to numerically simulate airflow around a conventional (cup-shaped) 2-bladed VAWT over a wide operational range (i.e. Tip Speed Ratio (TSR) from 0.4-1) in order to identify the peak performance point. Blade tapering has been shown to affect the performance of a wind turbine. As such, in the present study, three different VAWT configurations have been used with blade tapering corresponding to Delta, Rhomb and Cross shaped blades. It has been observed that tapering the blades of a Savonius VAWT significantly reduces the torque coefficient of the turbine, while there is a slight decrease in the power coefficient. Comparing the three tapered blade configurations, the delta blades depict higher performance than the competitor designs.",
keywords = "Vertical Axis Wind Turbine, Computational Fluid Dynamics, Tip Speed Ratio, Torque Coefficient",
author = "Martin Zahariev and Taimoor Asim and Rakesh Mishra and Blaise Nsom",
year = "2019",
month = "8",
day = "2",
language = "English",
volume = "22",
pages = "69--74",
journal = "International Journal of COMADEM",
issn = "1363-7681",
publisher = "COMADEM International",
number = "2",

}

Effects of blade tapering on the performance of vertical axis wind turbines analysed through advanced visualization techniques. / Zahariev, Martin; Asim, Taimoor; Mishra, Rakesh; Nsom, Blaise.

In: International Journal of COMADEM, Vol. 22, No. 2, 02.08.2019, p. 69-74.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of blade tapering on the performance of vertical axis wind turbines analysed through advanced visualization techniques

AU - Zahariev, Martin

AU - Asim, Taimoor

AU - Mishra, Rakesh

AU - Nsom, Blaise

PY - 2019/8/2

Y1 - 2019/8/2

N2 - Harnessing the wind energy effectively and efficiently, to fulfil the ever increasing energy demands, has long been an area of active research. This research study is aimed at exploring the blade design of a small-to-medium sized Savonius type Vertical Axis Wind Turbine (VAWT) for urban applications, as the published research in this area is severely limited. A commercial Computational Fluid Dynamics (CFD) based solver has been used to numerically simulate airflow around a conventional (cup-shaped) 2-bladed VAWT over a wide operational range (i.e. Tip Speed Ratio (TSR) from 0.4-1) in order to identify the peak performance point. Blade tapering has been shown to affect the performance of a wind turbine. As such, in the present study, three different VAWT configurations have been used with blade tapering corresponding to Delta, Rhomb and Cross shaped blades. It has been observed that tapering the blades of a Savonius VAWT significantly reduces the torque coefficient of the turbine, while there is a slight decrease in the power coefficient. Comparing the three tapered blade configurations, the delta blades depict higher performance than the competitor designs.

AB - Harnessing the wind energy effectively and efficiently, to fulfil the ever increasing energy demands, has long been an area of active research. This research study is aimed at exploring the blade design of a small-to-medium sized Savonius type Vertical Axis Wind Turbine (VAWT) for urban applications, as the published research in this area is severely limited. A commercial Computational Fluid Dynamics (CFD) based solver has been used to numerically simulate airflow around a conventional (cup-shaped) 2-bladed VAWT over a wide operational range (i.e. Tip Speed Ratio (TSR) from 0.4-1) in order to identify the peak performance point. Blade tapering has been shown to affect the performance of a wind turbine. As such, in the present study, three different VAWT configurations have been used with blade tapering corresponding to Delta, Rhomb and Cross shaped blades. It has been observed that tapering the blades of a Savonius VAWT significantly reduces the torque coefficient of the turbine, while there is a slight decrease in the power coefficient. Comparing the three tapered blade configurations, the delta blades depict higher performance than the competitor designs.

KW - Vertical Axis Wind Turbine

KW - Computational Fluid Dynamics

KW - Tip Speed Ratio

KW - Torque Coefficient

M3 - Article

VL - 22

SP - 69

EP - 74

JO - International Journal of COMADEM

JF - International Journal of COMADEM

SN - 1363-7681

IS - 2

ER -