Blade aerodynamic loads during idling
Category: Aerodynamics
Problem
How does Bladed calculate loads on the blades in case of idling? Does it utilize BEM method or does it somehow simplify the aerodynamic calculation?
Solution
For idling conditions the standard blade element momentum theory is used, however it is modified by the settings in the “aerodynamics control” screen which defines the TSR range at which zero and full inflow are applied. If the rotor is rotating slowly enough to fall into the ‘zero inflow’ condition, the induction factors are assumed zero and the aerodynamic loads are worked out from the blade geometry, the aerodynamic data tables and includes the effects of dynamic stall.
Keywords Aerodynamics, idling