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Tumble flap

A tumble flap is a flap housed in the intake area of many modern automotive gasoline engines to produce a swirl at right-angles to the cylinder axis. This swirling motion improves the air-fuel mixture and enhances power and torque, while at the same time lowering fuel consumption and decreasing emissions.[1] The flaps can be actuated with pneumatic or electric power. Furthermore, the position of the flap can be controlled continuously with a feedback controller or just kept either fully closed or open. Use of a tumble flap improves the lean burn ability of a spark-ignition engine.

  1. ^ "Audi Technology Portal - Tumble flaps". Audi Technology Portal. Retrieved 2017-01-09.

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Tumble (dynamique des fluides) French

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