Both BA and KLM, after all, had direct experience of what flying through volcanic ash can do to a high-bypass turbofan jet engine.

毕竟，英航和荷航都有用高旁路涡轮风扇喷气式飞机引擎穿越火山灰的经验。

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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。

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The latest "high bypass" turbofans, such as the Rolls-Royce Trent, push around nine times more air around the core of the engine than through it.

最近的高涵道比涡轮风扇，例如罗罗的遄达发动机，推动空气通过发动机核心周围的空气相较于通过核心气量9倍。

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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

Both BA and KLM, after all, had direct experience of what flying through volcanic ash can do to a high-bypass turbofan jet engine.

ECONOMIST: The effect on business and leisure

However high-bypass engines are built in the future, at their core they will still have a basic jet engine.

ECONOMIST: A new way to build a greener jet engine