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( School of Business, Engineering and Science )
Turbulence influence on optimum tip speed ratio for a 200 kW vertical axis wind turbine
Möllerström, Erik, Eriksson, Sandra, Goude, Anders, Ottermo, Fredric, Hylander, Jonny
Article in journal (Refereegranskat)
The influence of turbulence intensity (TI) on the tip speed ratio for maximum power coefficient, here called λCp-max, is studied for a 200 kW VAWT H-rotor using logged data from a 14 month period with the H-rotor operating in wind speeds up to 9 m/s. The TI - λCp-max relation is examined by dividing 10 min mean values in different turbulence intensity ranges and producing multiple CP(λ) curves. A clear positive relation between TI and λCp-max is shown and is further strengthened as possible secondary effects are examined and deemed non-essential. The established relation makes it possible to tune the control strategy to enhance the total efficiency of the turbine.