Velocity vector and turbulence in the symmetry plane of a Darrieus wind generator

Bergeles, G; Michos, A; Athanassiadis, N

dc.contributor.author	Bergeles, G	en
dc.contributor.author	Michos, A	en
dc.contributor.author	Athanassiadis, N	en
dc.date.accessioned	2014-03-01T01:08:35Z
dc.date.available	2014-03-01T01:08:35Z
dc.date.issued	1991	en
dc.identifier.issn	0167-6105	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10595
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Mechanics	en
dc.subject.other	Flow Of Fluids--Turbulent	en
dc.subject.other	Flow Of Fluids--Wakes	en
dc.subject.other	Rotors--Aerodynamics	en
dc.subject.other	Wind Tunnels	en
dc.subject.other	Darrieus Wind Generator	en
dc.subject.other	Tip Speed Ratio	en
dc.subject.other	Velocity Vector	en
dc.subject.other	Vertical Axis Wind Generators	en
dc.subject.other	Wind Turbines	en
dc.title	Velocity vector and turbulence in the symmetry plane of a Darrieus wind generator	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0167-6105(91)90007-J	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0167-6105(91)90007-J	en
heal.language	English	en
heal.publicationDate	1991	en
heal.abstract	This paper reports experimental results for the flow field of a Darrieus type wind generator model of diameter 1.7 m tested in a closed circuit wind tunnel. Velocity vector and turbulence measurements in the symmetry plane of the rotor (horizontal plane) were taken using an X-hotwire. The measurements covered the near field around the model from half a rotor diameter upstream to one diameter downstream. The results indicated that the edges of the wake are easily identifiable by the abrupt change in the wake velocity to that of the undisturbed flow and also by the high turbulence level. At tip speed ratios of up to about 5.4, the upstream flow, even at a location within half a rotor diameter, seems not to be affected by the operation of the wind generator, whilst small effects are present at a tip speed ratio of 7. The flow field downstream of the rotor is asymmetric with a tendency for the flow to turn in the direction of rotor rotation by only 7-degrees at a tip speed ratio of around 4.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Wind Engineering and Industrial Aerodynamics	en
dc.identifier.doi	10.1016/0167-6105(91)90007-J	en
dc.identifier.isi	ISI:A1991FZ29700006	en
dc.identifier.volume	37	en
dc.identifier.issue	1	en
dc.identifier.spage	87	en
dc.identifier.epage	101	en