采用三维数值模拟的方法对某涵道风扇进行了性能仿真分析,获取了某涵道风扇不同倾转角度下及垂直姿态不同侧风条件下的气动特性,结果显示:在10m/s的迎风条件下,倾转角度对涵道风扇的气动特性会产生较明显的影响,随着倾转角度α的增大,涵道拉力、转子拉力、总拉力、功率以及力效均呈现先增大后减小的趋势,且在α=60°时达到峰值。倾转角度对涵道拉力的影响比对风扇转子拉力及功率的影响更为明显,倾转角度对唇口附近区域的流动情况影响较为显著。垂直姿态下,侧风速度对涵道风扇的影响主要体现在涵道性能的变化,涵道风扇力效的改变主要由涵道性能决定。侧风会导致涵道风扇转子进口轴向速度重新分布,影响较为明显区域主要集中在50%叶高以上区域。

Adopting 3-D numerical method, The performance simulation analysis of a Ducted-Fan was carried out . The aerodynamic characteristics of a Ducted-Fan under different tilt angles and different crosswind velocity on vertical conditions were obtained. The results show that: Under the windward condition of 10m/s, the tilt angle has a significant influence on the aerodynamic characteristics of the ducted fan. With the increase of the tilt angle, 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 force of the ducted is more obvious than that on the force and power of the fan rotor. And the influence of the tilt angle on the flow in the area near the clip 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 effect is mainly determined by the ducted fan performance. Crosswind results in a redistribution of axial velocity at the inlet of the ducted fan rotor, with the most significant impact concentrated in areas above 50% blade height.