At the University of Cagliari, FLUENT has been used to analyze an aerodynamic problem that would be difficult to tackle experimentally [1]. The study concerned a 41 m diameter wind rotor; the disturbed flow field, including the wake, extends over hundreds of meters in the axial direction with a very large cross section. The computational domain used is in the shape of a diffuser, extending in the axial direction roughly 5 diameters upstream and 10 diameters downstream of the rotor. The one-equation Spalart- Allmaras model with standard wall functions was chosen for turbulence closure. The classical blade element momentum (BEM) method was adopted for the design of the turbine rotor [2], using the specifications for the three-bladed horizontal axis Nordtank 41/500 turbine and NACA 63-4xx profiles. CFD and BEM method were used to analyze wind turbines operating and off-design conditions.
The Economy of Large Scale Wind Turbines
MANDAS, NATALINO;CAMBULI, FRANCESCO
2005-01-01
Abstract
At the University of Cagliari, FLUENT has been used to analyze an aerodynamic problem that would be difficult to tackle experimentally [1]. The study concerned a 41 m diameter wind rotor; the disturbed flow field, including the wake, extends over hundreds of meters in the axial direction with a very large cross section. The computational domain used is in the shape of a diffuser, extending in the axial direction roughly 5 diameters upstream and 10 diameters downstream of the rotor. The one-equation Spalart- Allmaras model with standard wall functions was chosen for turbulence closure. The classical blade element momentum (BEM) method was adopted for the design of the turbine rotor [2], using the specifications for the three-bladed horizontal axis Nordtank 41/500 turbine and NACA 63-4xx profiles. CFD and BEM method were used to analyze wind turbines operating and off-design conditions.
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