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Performance of a vertical axis wind turbine under accelerating and decelerating flows.

Shahzad, Atif; Asim, Taimoor; Mishra, Rakesh; Paris, Achilleos


Atif Shahzad

Rakesh Mishra

Achilleos Paris


Rapid increase in global energy requirements has resulted in considerable attention towards energy generation from the renewable energy sources. In order to meet renewable energy targets, harnessing energy from all available resources including those from urban environment is required. Vertical Axis Wind Turbines (VAWTs) are seen as a potential way of utilising urban energy sources. Most of the research on the wind turbines constitutes condition monitoring and performance optimisation of VAWTs under a constant velocity of air where the transient effects have not been accounted. The inconsistent behaviour of the wind may change the nature of the flow field around the VAWT which could decrease its life cycle. This study is an attempt to use Computational Fluid Dynamic's techniques to study and analyse the performance of a wind turbine under accelerating and decelerating air inlet velocity. The performance of a VAWT is monitored under an accelerated and decelerated gust of the value 1.09m/s2 characterised by change in velocity from 4m/sec to 10m/sec. The instantaneous torque output varies significantly when a gust of air is applied to the turbine. Furthermore the torque outputs during accelerating and decelerating flows vary, highlighting the effect of transient phenomena. This abrupt change in the instantaneous torque output of the turbine may give rise to highly transient loads on the turbine's structure which may induce heavy stresses on the turbine leading to structural failure. It has been shown that CFD can be used as an effective tool to predict the performance outputs of a VAWT under varying flow conditions.


SHAHZAD, A., ASIM, T., MISHRA, R. and PARIS, A. 2013. Performance of a vertical axis wind turbine under accelerating and decelerating flows. Procedia CIRP [online], 11: proceedings of 2nd Through-life engineering services international conference 2013 (TESConf 2013), 5-6 November 2013, Cranfield, UK, pages 311-316. Available from:

Journal Article Type Conference Paper
Conference Name 2nd Through-life engineering services international conference 2013 (TESConf 2013)
Conference Location Cranfield, UK.
Acceptance Date Jul 29, 2013
Online Publication Date Sep 27, 2013
Publication Date Dec 31, 2013
Deposit Date Jun 4, 2021
Publicly Available Date Jun 4, 2021
Journal Procedia CIRP
Print ISSN 2212-8271
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 11
Pages 311-316
Keywords Vertical axis wind turbine;Computational fluid dynamics; Tip speed ratio; Power output
Public URL


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