The new tip loss correction, initially developed for ID BEM computations , is now extended to 2D Actuator Disc / Navier-Stokes (AD/NS) computations and 3D Actuator Line / Navier-Stokes (AL/NS) computations. As shown in the paper, the tip loss correction is an important and necessary step for actuator / Navier-Stokes models. Comparisons of the present results with those obtained from a EM code with new tip correction and experimental data show that the tip loss correction is correctly implemented in the actuator / Navier-Stokes models. The results demonstrate also that difference between atuator line and actuator disc based models may increase especially for flows at low tip speed ratio. Since the flows at low tip speed ratio are far to be considered as axisymmetrical flows, the actuator disc models that are based on axisymmetical flow behaviors may not be valid. Keywords: Actuator Disc, Actuator Line, Navier-Stokes equations, Tip loss correction.
|Title of host publication||Proceedings of the special Topic Conference: The Science of making Torque from Wind|
|Editors||G.A.M. van Kuik|
|Place of Publication||Delft|
|Publisher||Delft University of Technology|
|Publication status||Published - 2004|