With the current global trend of wind turbines to be commissioned, next generation state-of-the-art will have a generating capacity 20 MW with rotor diameters 250 m or larger. This systematic increase in size is prompted by economies-of-scale factors, thereby resulting continuously decreasing cost per kWh generated. However, such large rotors larger masses associated them and necessitate studie...

BACKGROUND Unexpected performance degradation occurs in wind turbine blades due to leading edge defect when suffering from continuous impacts with rain drops, hails, insects, or solid particles during its operation life. To assess this issue, this paper numerically investigates the steady and dynamic stall characteristics of an S809 airfoil with various leading edge defects. More leading edge d...

The free-to-roll technique is used as a tool for predicting areas of uncommanded lateral motions. Recently, the NASA/Navy/Air Force Abrupt Wing Stall Program extended the use of this technique to the transonic speed regime. Using this technique, this paper evaluates various wing configurations on the pre-production F/A-18E aircraft and the Joint Strike Fighter (F-35) aircraft. The configuration...

Abstract At present, the control capability of dielectric barrier discharge (DBD) plasma actuation covers flow velocity range helicopter’s retreating blades, so it is necessary to extend dynamic stall rotor airfoils. A DBD actuator was adopted an oscillating CRA309 airfoil in this paper. The effectiveness alternating current (AC) on reducing area lift hysteresis loop verified through pressure m...