Titel: Aerforce: Subroutine Package for unsteady Blade-Element/Momentum Calculations, FFA TN 2000-07
Författare: Anders Björck
Utgivare: Flygtekniska Försöksanstalten
Årtal: 2000
Ämnesord: Mekanik och aerodynamik
Sökord/keywords: Aerodynamic, HAWT, Blade-Element/Momentum method (BEM), vindforsk.
Rapport (Pdf)
Sammanfattning/Abstract: A subroutine package, called AERFORCE, for the calculation of aerodynamic forces of wind turbine rotors has been written.
The subroutines are written in FORTRAN.
AERFORCE requires the input of airfoil aerodynamic data via tables as function of angle of attack, the turbine blade and rotor geometry and wind and blade velocities as input.
The method is intended for use in an aeroelstic code. Wind and blade velocities are given at a sequence of time steps and blade forces are returned.
The aerodynamic method is basically a Blade-Element/Momentum method. The method is fast and coded to be used in time simulations. In order to obtain a steady state solution a time simulation to steady state conditions has to be carried out.
The BEM-method in AERFORCE includes extensions for:
• Dynamic inflow: Unsteady modeling of the inflow for cases with unsteady blade loading or unsteady wind.
• Extensions to BEM-theory for inclined flow to the rotor disc (yaw model).
• Unsteady blade aerodynamics: The inclusion of 2D attached flow unsteady aerodynamics and a semi-empirical model for 2D dynamic stall.