Turbulence influence on wind energy extraction for a medium size vertical axis wind turbine
2016 (English)In: Wind Energy, ISSN 1095-4244, E-ISSN 1099-1824, Vol. 19, 1963-1973 p.Article in journal (Refereed) Published
The relation between power performance and turbulence intensity for a VAWT H-rotor is studied using logged data from a 14 month (discontinuous) period with the H-rotor operating in wind speeds up to 9 m/s. The turbine, designed originally fora nominal power of 200 kW, operated during this period mostly in a restricted mode due to mechanical concerns, reachingpower levels up to about 80 kW. Two different approaches are used for presenting results, one that can be compared topower curves consistent with the International Electrotechnical Commission (IEC) standard and one that allows isolatingthe effect of turbulence from the cubic variation of power with wind speed. Accounting for this effect, the turbine stillshows slightly higher efficiency at higher turbulence, proposing that the H-rotor is well suited for wind sites with turbulentwinds. The operational data are also used to create a Cp(λ) curve, showing slightly lower Cp compared with a curvesimulated by a double multiple streamtube model.
Place, publisher, year, edition, pages
2016. Vol. 19, 1963-1973 p.
VAWT; H-rotor; turbulence intensity; power coefficient curve
IdentifiersURN: urn:nbn:se:uu:diva-277352DOI: 10.1002/we.1962OAI: oai:DiVA.org:uu-277352DiVA: diva2:904731