Standard blade element momentum(BEM) codes
use Prandtl’s tip-loss correction which relies on simplified
vortex theory under the assumption of optimal
operating condition and no wake expansion. A
new tip-loss correction for implementation in BEM
codes has been developed using a lifting-line code
to account for the effect of wake expansion, roll-up
and distortion under any operating conditions. A
database of tip-loss corrections is established for further
use in BEM codes. Using this model a more
physical representation of the flow and hence a better
assessment of the performance of the turbine by
BEM codes is expected.