Input:

Description

Blade Mass:

The mass of a single blade.  

Blade Centre of Mass Location:

The centre of mass location, measured with respect to the root along the preconed axis.

Input:

Description

Blade Span:

The distance along the (possibly preconed) blade-pitch axis from the root. This is illustrated by 'BlSpn' in Blade Geometry - Side View. The span entries must be entered in monotonically increasing order, from the most inboard to the most outboard. The first span must be zero and the last span should be located at the blade tip. Each blade definition must have properties defined for at least two values of blade span.

Aerodynamic Centre Out-of-Plane Offset:

The local out-of-plane offset (when the blade-pitch angle is zero) of the aerodynamic center (reference point for the aerofoil lift and drag forces), normal to the blade-pitch axis, as a result of blade curvature. This is illustrated by 'BlCrvAC' in Blade Geometry - Side View. The offset is measured positive downwind; upwind turbines have negative offsets for improved tower clearance.

Aerodynamic Centre In-Plane Offset:

The local in-plane offset (when the blade-pitch angle is zero) of the aerodynamic center (reference point for the aerofoil lift and drag forces), normal to the blade-pitch axis, as a result of blade sweep. This is illustrated by 'BlSwpAC' in Blade Geometry - Front View. A positive offset is opposite the direction of rotation.

Curvature Angle:

The local angle (in degrees) from the blade-pitch axis of a vector normal to the plane of the aerofoil, as a result of blade out-of-plane curvature (when the blade-pitch angle is zero). This is illustrated by 'BlCrvAng' in Blade Geometry - Side View. Curvature angle is measured positive downwind; upwind turbines have negative curvature angles for improved tower clearance.

Twist Angle:

The local aerodynamic twist angle (in degrees) of the aerofoil. It is the orientation of the local chord about the vector normal to the plane of the aerofoil, positive to feather, leading edge upwind. The blade-pitch angle will be added to the local twist.

Chord Length:

The local chord length.

Aerofoil Index:

This entry specifies which aerofoil data input file is to associated with this local blade span position. Valid values are numbers between 1 and the Total Number of Aerofoil Input Files. Multiple blade nodes can use the same aerofoil data.