Analysis of wind turbine airfoil trailing edge jets and power loading effects
The finite element model of DU91-W2-250 wind turbine airfoil was established by numerical calculation method,and the SST k-ω turbulence model suitable for airfoil simulation was used to study the original airfoil and the airfoil with added trailing-edge jet ports,the lift coefficient and drag coefficient were obtained and the flow field was analyzed for different angles of attack and different jet speed.Finally,the effect of airfoil shape on power and load is calculated by momentum-voxel theory.The results show that:In the range of 0°to 8°angle of attack,the lift coefficient and drag coefficient increase linearly,and the lift-to-drag ratio remains constant.The drag coefficient rises significantly for angle of attack greater than 8°,and the jet does not improve the aerodynamic characteristics of the airfoil.Add gas-jet airfoil within 8°angle of attack increases the unit power of airfoil,but the cost is to increase the load of the blade.
Gas-jetFlow controlAerodynamic performanceBlade loadBlade power
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