A
diverterless supersonic inlet (DSI) is a type of
jet engine air intake used by some modern
combat aircraft to control air flow into their engines. It consists of a "bump" and a forward-swept inlet cowl, which work together to divert
boundary layer airflow away from the aircraft's engine. This eliminates the need for a
splitter plate, while compressing the air to slow it down from supersonic to subsonic speeds. The DSI can be used to replace conventional methods of controlling supersonic and boundary-layer airflow.