Test result shows: this method can improve the accuracy and efficiency of fan trouble diagnosis.

试验结果表明：该方法可以有效提高风机故障诊断的精度和效率。

youdao

Another model, the "Oorja", developed by BP and the Indian Institute of Science, has an integrated battery-powered fan to direct air to wood pellets in the combustion chamber, improving efficiency.

另一个模型，“Oorja”，由BP和印度科学院开发，拥有一个内置的电池驱动风扇来使空气对准燃烧室内的木球，从而提高效能。

youdao

One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.

提高高旁通飞机引擎的方法之一就是把风扇变成开放式旋翼，有点回归于螺旋桨的味道，但要使用两圈粗短的反旋桨叶。

youdao

One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.

ECONOMIST: A new way to build a greener jet engine