Dynamics of the interaction between the rotor and the induction zone
Journal of Physics, Conference Series
Finding the ideal strategy: Full-scale fatigue testing of wind turbine rotor shafts T Rauert, J Herrmann, P Dalhoff et al. Rotor clearance design and evaluation for an oil injected twin screw compressor D Buckney, A Kovacevic and N Stosic Comparison of simulations on the NewMexico rotor operating in pitch fault conditions L Oggiano, K Boorsma, G Schepers et al. Effect of surface roughness on helicopter main rotor blade W N W Rohizan, A S M Rafie, M Y Harmin et al. Abstract. Traditionally met
... raditionally met masts are used for power and load verifications. They are normally placed 2-4 rotor diameters ahead of the turbine. However in complex terrain this can lead to complex analysis of the effect of the terrain on the flow field. A nacelle mounted lidar can provide a better tool for wind field measurements in all terrains. Provided that the measurement is close enough to the rotor disc, the uncertainty in the flow field measurement can be reduced significantly. Therefore any complex terrain calibration and changes in the wind direction can be avoided. However, close distance lidar measurements are affected by the presence of the wind turbine, due to its induction zone. In this work, the dynamic coupling between changes in the wind turbine operating point and the velocities inside the induction zone is studied. Reynolds-Averaged Navier-Stokes (RANS) simulations are used to investigate this interaction. Thereafter, system identification is used to fit first order dynamic models to the simulation results. The parameters of the model are given for the turbine induction zone. These results possibly reduce the uncertainty in lidar measurements, arising from wind turbine blockage.