195 research outputs found
Two modifications of the BEM method based on validation with results of actuator disc simulations
Trailed vorticity modeling for aeroelastic wind turbine simulations in stand still
Current fast
aeroelastic wind turbine codes suitable for certification lack an induction\ud
model for standstill conditions. A trailed vorticity model previously used as
an addition to a blade element momentum theory based aerodynamic model in
normal operation has been extended to allow computing the induced velocities
in standstill. The model is validated against analytical results for an
elliptical wing in constant inflow and against standstill measurements from
the NREL/NASA Phase VI unsteady experiment. The extended model obtains good
results in the case of the elliptical wing but underpredicts the steady
loading for the Phase VI blade in attached flow. The prediction of the
dynamic force coefficient loops from the Phase VI experiment is improved by
the trailed vorticity modeling in both attached flow and stall in most cases.
The exception is the tangential force coefficient in stall, where the codes
and measurements deviate and no clear improvement is visible. This article
also contains aeroelastic simulations of the DTU
10 MW reference turbine in standstill at turbulent inflow with a fixed and
idling rotor. The influence of the trailed vorticity modeling on the extreme
flapwise blade root bending moment is found to be small
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