Supervisor: Niels Troldborg, DTU Wind Energy
Examiner: Jesper Monrad Laursen, Siemens Gamesa
The defence is a part of the Online Wind Energy Master
About the Online Wind Energy Master
The part-time master programme is scheduled to take two to four years, making it possible for participants to study while working. The participants come from all over the world and in August, the first participants graduate.
On Friday August 30, 2019, there will be a reception in B118 for the eight graduates.
Abstract: Simulations of the Effect of Leading Edge Surface Roughness on Aerodynamic Performance of Airfoils
Leading-edge roughness is a common defect of wind turbine blade due to manufacture or wind farm environment, and both operational risk and economic cost could be caused accordingly. To investigate this, one basic research field is numerical simulation with surface roughness model to predict the aerodynamic performance of airfoil with leading edge roughness. One typical wallbounded flow turbulence model k–ω SST extended with roughness boundary is implemented into EllipSys, a code for CFD developed by DTU, and applied to simulate flow over roughed flat plate, in roughed pipe and over leading edge roughed NACA65215 and DU93-W-210 in this report.
Results are discussed and compared with simulations from literature and test data for verification and validation. General agreement is obtained to show the strength of this model in simulation of roughness effect; meanwhile, deviations are also seen to reveal the limitations in using this model, esp. for very large roughness conditions. Flow over airfoil with adverse pressure gradient increases the difficulty in predicting the roughness influence in application of this model. However, for lower angle of attacks this model shows fine prediction of airfoil lift.