A blade element momentum model for dual-rotor wind turbines considering inter-rotor velocity interferences

Abstract A blade element momentum model for predicting the aerodynamic performance of dual-rotor wind turbines (DRWTs) as an design tool is introduced in this paper. The considers inter-rotor axial velocity reduction and tangential components front rotor’s wake to interferences inflow input BEM theory. DRWT with two NREL 5MW rotors studied using present CFD simulations. Results from methods show good agreements each other trends power, thrust, loads on blades despite error near-tip regions. configurations have lower optimum tip speed ratios a wider range high- C P speeds. maximum efficiency turbine improved by only 5%, indicating that dedicated aerodynamics required enhance power output loads.