涵道风扇

1
ducted fan
涵道螺旋桨（Shrouded Propeller）和涵道风扇(Ducted fan)是指被涵道包围的螺旋桨和螺旋桨，其气动效率高，安全性能好，常用作飞行器的升力系统。

短语

1
涵道风扇无人机的姿态调整是其控制的一个关键点也是一个难点。
The position adjustment is both a key technology and difficult point for control of the ducted fan UAV.
2
深入探讨了单旋翼涵道风扇式无人直升机的动力学原理，结合其全量方程和线性化增量方程，推导出了其钟摆模态的数学表示。
Then the equation of helicopter pendulum is derived from the nonlinear differential equation and linear differential equation, with the principle of helicopter aerodynamics.
3
2009年，通用电气和NASA（美国航空航天总署）合作，重新开始19世纪80年代搁置的一项工作，继续一种颠覆传统的无涵道风扇发动机实验。
In 2009 GE, working with NASA, America’s space agency, picked up work it had largely set aside in the 1980s on a radically different sort of engine called an unducted fan.

涵道风扇
涵道风扇，较同样直径的孤立风扇能产生更大的升力,且风扇环括在涵道内,既可阻挡风扇气动声向外传播,又结构紧凑、安全性高。以此为升力面和飞行操纵面可构造出多种小型垂直起降无人飞行器。该类无人飞行器在前飞时,涵道处于前方来流和风扇吸流的复杂气流中,其升力、阻力和俯仰力矩对整机的配平乃至稳定控制具有决定性影响。

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