Description
The blade body data file defines the inertial properties of a rigid turbine blade. Rigid blades are modeled using a series of aerodynamic elements exerting forces and torques on a single body with lumped properties. The lumped properties are described below.
Parameters
| Name | Description | Value | Unit |
|---|---|---|---|
m |
Blade mass. | Real scalar | [kg] |
S_blade |
Blade spanwise length. | Real scalar | [m] |
blade_cm |
Distance to the blade center of mass along the spanwise direction. | Real scalar | [m] |
I_xx |
(x,x) component of the inertia tensor about the blade’s center of mass. | Real scalar | [kg.m²] |
I_yy |
(y,y) component of the inertia tensor about the blade’s center of mass. | Real scalar | [kg.m²] |
I_zz |
(z,z) component of the inertia tensor about the blade’s center of mass. | Real scalar | [kg.m²] |
I_xy |
(x,y) component of the inertia tensor about the blade’s center of mass. | Real scalar | [kg.m²] |
I_xz |
(x,z) component of the inertia tensor about the blade’s center of mass. | Real scalar | [kg.m²] |
I_yz |
(y,z) component of the inertia tensor about the blade’s center of mass. | Real scalar | [kg.m²] |
Notes
The blade body data is stored in a .txt file that can easily be produced using the Data Generation Tool or by populating a .txt file manually. If the file is created manually, parameters must be defined in the format name = value;, where name is the parameter name and value is a number of type Real. Comments can be inserted in the file using double slash: //. See below for an example.
// =============================================
// Inertial properties
// =============================================
m = 123.456; // mass [kg]
I_xx = 1.23e4; // mass moment of inertia [kg.m²]
// =============================================
// Geometric properties
// =============================================
l = 12.345; // length [m]
The diagram shows a turbine blade with the body-fixed coordinates defined at its root. The z-axis extends from the root in the direction of the blade span. For an unpitched blade, the x-axis points in the downwind direction and the y-axis lies in the rotational plane. The blade span is input parameter S_blade and the spanwise distance to the center of mass is blade_cm.
