Simulation Study on Aerodynamic Characteristics of 350 kW Ducted-Fan
Adopting 3-D numerical method,the performance simulation analysis of 350 kW ducted-fan was carried out.The aerodynamic characteristics of 350 kW ducted-fan at different tilt angles and differ-ent crosswind velocities under vertical attitude were obtained.The results show that under the 10 m/s windward condition,the tilt angle has a significant influence on the aerodynamic characteristics of the ducted fan.With the increase of the tilt angle α,the ducted tension,rotor tension,total tension,power and force efficiency all show a trend of increasing first and then decreasing.At α=60°,the peak is reached.The influence of the tilt angle on the ducted tension is more obvious than that on the fan rotor tension and power.And the influence of the tilt angle on the flow in the area near the lip opening is more obvious.Under vertical attitude,the influence of crosswind velocity on the ducted fan is mainly reflected in the change of the ducted fan performance,and the change of the ducted fan force efficiency is mainly determined by the ducted fan performance.Crosswind results in a redistribution of axial velocity at the in-let of the ducted fan rotor,with the most significant impact concentrated in areas above 50％blade height.
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