EVER WONDERED WHAT IS THAT FIN ON THE ENGINE WHAT IS ITS PURPOSE
It Starts with the Obstruction in the spanwise flow of the air under the wings due to the wing mounted engines.The location and mounting system of aero engines affects the structural design of the wings.
Local airflow around the engine cowlings can add to the problem of over-wing vortex and can be controlled by the addition of a Chine(s) or Strake(s) to guide the air backward and below the wing. Diagram 3.29 shows a single strake fitted to the inboard side of the engine cowling. Other aircraft may require one on each side