Development of a second order dynamic stall model

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Dynamic stall phenomena bring risk for negative damping and instability in wind turbine blades. It is crucial to
model these phenomena accurately to reduce inaccuracies in predicting design driving (fatigue) loads. Inaccuracies in current
dynamic stall models may be due to the facts that they are not properly designed for high angles of attack, and that they do not
10 specifically describe vortex shedding behaviour. The Snel second order dynamic stall model attempts to explicitly model
unsteady vortex shedding. This model could therefore be a valuable addition to DNV GL’s turbine design software Bladed. In
this thesis the model has been validated with oscillating airfoil experiments and improvements have been proposed for reducing
inaccuracies. The proposed changes led to an overall reduction in error between the model and experimental data. Furthermore
the vibration frequency prediction improved significantly. The improved model has been implemented in Bladed and tested
15 against small scale turbine experiments at parked conditions. At high angles of attack the model looks promising for reducing
mismatches between predicated and measured (fatigue) loading. Leading to possible lower safety factors for design and more
cost efficient designs for future wind turbines
Originele taal-2English
Aantal pagina's18
TijdschriftWind Energy Science
StatusPublished - 4 dec 2019

Keywords

  • windenergie

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