수평축 충력발전용 터빈의 3차원 유동특성 및 성능평가에 관한 연구

Abstract

Various theoretical design techniques to reflect loss factors are reviewed for the optimum design of rotor blade of HAWTs(Horiz-ontal Axis Wind Turbines). Also, wind resources in Korea Mari- time University is investigated for the design of offshore wind farm in the future. Estimation of average wind speed is 4.76 and it's electric power productive capacity is 32.78.

A CFD study on the aerodynamic characteristics of NACA 63215 airfoil, with some kind of flaps at trailing edge has been performed to know the effect of various flaps. In case of 1.5% height flap of chord length with 90°attachment, lift to drag ratio of NACA 63215 airfoil shows the highest value.

The estimated performance and flow characteristics have been obtained from numerical simulation for two and three blades type HAWT model which was designed by Delft University of Technology in Netherlands. The comparison between BEM and CFD results indicates a good agreement within an error of less than 10%. The numerical simulation results on the complex 3-D stall shows a good agreement with inviscid stall model and calculated wake distribution of two blades type rotor shows the similar pattern of the smoke visualized result from NREL(National Renewable Energy Laboratory).