Cascade analysis of a floating wind turbine rotor
Journal article, Peer reviewed
Permanent lenke
http://hdl.handle.net/11250/286503Utgivelsesdato
2014Metadata
Vis full innførselSamlinger
Originalversjon
Eliassen, L.; Jakobsen, J.B., Knauer, A. & Nielsen, F.G. (2014) Cascade analysis of a floating wind turbine rotor. Journal of Physics, Conference Series 555(1) 10.1088/1742-6596/555/1/012053Sammendrag
Mounting a wind turbine on a
floating foundation introduces more complexity to
the aerodynamic loading. The
floater motion contains a wide range of frequencies. To study
some of the basic dynamic load effect on the blades due to these motions, a two-dimensional
cascade approach, combined with a potential vortex method, is used. This is an alternative
method to study the aeroelastic behavior of wind turbines that is different from the traditional
blade element momentum method. The analysis tool demands little computational power
relative to a full three dimensional vortex method, and can handle unsteady
flows.
When using the cascade plane, a "cut" is made at a section of the wind turbine blade. The flow is viewed parallel to the blade axis at this cut. The cascade model is commonly used for
analysis of turbo machineries. Due to the simplicity of the code it requires little computational
resources, however it has limitations in its validity. It can only handle two-dimensional potential flow, i.e. including neither three-dimensional effects, such as the tip loss effect, nor boundary
layers and stall effects are modeled. The computational tool can however be valuable in the
overall analysis of floating wind turbines, and evaluation of the rotor control system.
A check of the validity of the vortex panel code using an airfoil profile is performed,
comparing the variation of the lift force, to the theoretically derived Wagner function. To
analyse the
floating wind turbine, a
floating structure with hub height 90 m is chosen. An axial
motion of the rotor is considered.
Beskrivelse
http://iopscience.iop.org/1742-6596/555/1/012053