This paper presents the aerodynamic design and economical evaluation of a 200 kW site specific wind turbine for the province of Semnan in Iran. By designing site specific wind turbines, the cost of energy which is calculated out of the annual energy production and also the cost of manufacturing the rotor are minimized. The aerodynamic design is based on the well-known blade element momentum...

Free stream tidal turbines are a source of growing interest in the marine renewable energy field. Some designs that use an actuated mechanism to control individual blade pitch, as the tidal current varies and even during a revolutionary cycle, face the challenge of ensuring high reliability under the loads imposed on the device in the harsh sub sea environment. Adaptive materials have been used...

Abstract. In typical industrial practice based on IEC standards, wind turbine simulations are computed in the time domain for each mean speed bin using a few unsteady seeds. Software such as FAST, BLADED, or HAWC2 can be used to capture unsteadiness and uncertainties of simulations. The statistics these aeroelastic simulation outputs extracted calculate fatigue extreme loads components. minimum...

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 sho...

The physically correct capture of propeller-rudder interaction is important if ship self-propulsion parameters are to be accurately predicted. Full resolution of a time accurate computational fluid dynamics calculation based on the Reynolds Averaged Navier Stokes equations requires a significant computational resource. The axial and tangential accelerations generated in the flow by the passage ...

Ship rudders are almost always placed downstream of the propeller so they can take advantage of the increased local velocity due to the presence of the propeller race. The methods discussed in this paper replicate the flow integrated effects of the propeller which generates an accelerated and swirled onset flow onto the rudder. As long as the radial variation in axial and tangential momentum (i...

This paper presents a study of the impact icing on performance pitch-regulated large wind turbine. Numerical simulations six blade sections NREL 5 MW turbine at various free stream velocities are performed. Blade Element Momentum (BEM) method along Computational Fluid Dynamics (CFD) bases multiphase numerical used for this study. Analysis shows that simulated parameters in good agreement with r...