*TURBINE GEOMETRY |
 
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*TURBINE GEOMETRY |
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To specify information relating to a wind turbine, including the hub, shaft, bearings and nacelle.
Refer to Turbine Geometry for further information.
A block of lines specifying a variety of information relating to a wind turbine.
OVERHANG=Overhang distance
SHAFT TILT=Shaft tilt angle
TOWER TOP NODE=Tower top node (Number or Label)
TOWER TO SHAFT=Tower to shaft distance
YAW ANGLE=Yaw angle
AZIMUTH ANGLE=Azimuth Angle
HUB MASS=Hub mass
YAW BEARING MASS=Yaw bearing mass
FRONT BEARING MASS=Shaft front bearing mass
REAR BEARING MASS=Shaft rear bearing mass
NACELLE MASS=Nacelle mass, Nacelle COM X, Nacelle COM Y, Nacelle COM Z
HUB BUOYANCY=Hub volume (MHK turbines only), Hub COB X distance, Hub COB Y distance, Hub COB Z distance
NACELLE BUOYANCY=Nacelle volume(MHK turbines only), Nacelle COB X distance, Nacelle COB Y distance, Nacelle COB Z distance
The last two lines, relating to hub and nacelle buoyancy are are only used with MHK turbines. As Flexcom is currently designed to work with wind turbines only, these options are not relevant.
Input: |
Description |
Overhang: |
The distance along the (possibly tilted) rotor shaft between the tower centerline and hub center, measured positive downwind. Upwind rotors have a negative overhang. This is illustrated by 'Overhang' in Turbine Geometry and subsequent schematics |
Shaft Tilt: |
The angle in degrees between the rotor shaft and the horizontal plane. A positive shaft tilt angle means that the downwind end of the shaft is the highest. Upwind turbines have a negative shaft tilt angle for improved tower clearance. This is illustrated by 'ShftTilt' in Turbine Geometry and subsequent schematics. |
Tower Top Node: |
The location (node number/label) in the finite element model which corresponds to the tower top location. |
Tower to Shaft: |
The vertical distance from the top of the tower to the shaft axis. This is illustrated by 'Twr2Shft' in Conventional Upwind Turbine Layout. |
Yaw Angle: |
The initial yaw angle of the turbine about the vertical tower axis. It is positive counterclockwise when looking down on the turbine in plan view. |
Azimuth Angle: |
The initial azimuth angle for Blade 1. It is positive clockwise when looking downwind. |
Hub Mass: |
The mass of the hub. This is illustrated by 'Hub C.M.' in Conventional Upwind Turbine Layout. |
Yaw Bearing Mass: |
The mass of the yaw bearing. This is illustrated by 'Yaw Bearing C.M.' in Conventional Upwind Turbine Layout. |
Shaft Front Bearing Mass: |
The mass of the front shaft bearing. Note that the front bearing is currently located at a distance along the shaft which is equal to 90% of the overhang distance, in a direction towards the hub from the tower-shaft intersection point. |
Shaft Rear Bearing Mass: |
The mass of the rear shaft bearing. Note that the rear bearing is currently located at a distance along the shaft which is equal to 20% of the overhang distance, in a direction towards the nacelle from the tower-shaft intersection point. |
Nacelle Mass: |
The mass of the nacelle. This is illustrated by 'Nacelle C.M.' in Conventional Upwind Turbine Layout. |
Nacelle CoM X: |
This input specifies the downwind distance to the nacelle centre-of-mass, measured from the tower top. See NacCMxn in Conventional Upwind Turbine Layout. |
Nacelle CoM Y: |
This input specifies the lateral distance to the nacelle centre-of-mass, measured from the tower top. See NacCMyn in Conventional Upwind Turbine Layout. |
Nacelle CoM Z: |
This input specifies the vertical distances to the nacelle centre-of-mass, measured from the tower top. See NacCMzn in Conventional Upwind Turbine Layout. |
Hub Volume (MHK turbines only): |
The volume of the hub for use in buoyancy computations, a modelling option in OpenFAST for MHK turbines. As Flexcom is currently designed to work with wind turbines only, this input and the subsequent ones relating to centre of buoyancy, are not relevant. |
Hub CoB X (MHK turbines only): |
The X component of the hub centre of buoyancy location. This input is not relevant and may be left unchanged from the default. |
Hub CoB Y (MHK turbines only): |
The Y component of the hub centre of buoyancy location. This input is not relevant and may be left unchanged from the default. |
Hub CoB Z (MHK turbines only): |
The Z component of the hub centre of buoyancy location. This input is not relevant and may be left unchanged from the default. |
Nacelle Volume (MHK turbines only): |
The volume of the nacelle for use in buoyancy computations, a modelling option in OpenFAST for MHK turbines. As Flexcom is currently designed to work with wind turbines only, this input and the subsequent ones relating to centre of buoyancy, are not relevant. |
Nacelle CoB X (MHK turbines only): |
The X component of the nacelle centre of buoyancy location. This input is not relevant and may be left unchanged from the default. |
Nacelle CoB Y (MHK turbines only): |
The Y component of the nacelle centre of buoyancy location. This input is not relevant and may be left unchanged from the default. |
Nacelle CoB Z (MHK turbines only): |
The Z component of the nacelle centre of buoyancy location. This input is not relevant and may be left unchanged from the default. |
(a)The last six entries relate to hub and nacelle buoyancy computations for MHK turbines in OpenFAST ($AERODYN->GENERAL->BUOYANCY=TRUE). As Flexcom is currently designed to work with wind turbines only, these inputs are not relevant.