Swirl flap
A swirl flap , also known as a swirl flap or intake duct shut-off, is a technical component of valve-controlled four-stroke internal combustion engines with at least two intake valves , which is installed in the air intake system in order to achieve a controlled rotary movement of the fresh gas or air charge flowing into the combustion chamber.
In the case of a four-valve cylinder head , for example, one inlet channel is designed as a “filling channel” and the other as a “swirl channel”, whereby the filling channel can be completely or partially closed by a swirl flap during partial load operation. By closing the swirl flap, the amount of gas in both intake ducts is distributed asymmetrically; the shape of the swirl duct, which is now more strongly flowed through, creates a stronger turbulence that improves the mixing of air and fuel in the low speed range . If the swirl flap is open, the combustion chamber is filled to a higher degree with air; this happens at high engine speeds. Swirl flaps have a positive effect on engine emissions and fuel consumption.
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Individual evidence
- ↑ Konrad Reif : Overview of diesel engine management. Springer Vieweg, 2014, ISBN 978-3-658-06555-3 , p. 50.