What is the primary function of wing-mounted vortex generators?

The primary function of wing-mounted vortex generators is to delay airflow separation over the wing. These small, fin-like aerodynamic devices are strategically placed on the wing's surface to manipulate the airflow. By generating vortices, which are rotating flows of air, vortex generators help maintain a more attached flow of air over the wing, particularly at higher angles of attack. This improved airflow helps to prevent premature flow separation, which can lead to a stall. Delaying separation allows the wing to maintain lift and improve overall aerodynamic efficiency, enhancing the aircraft's performance during critical phases such as takeoff and climbing.

In contrast, increasing aerodynamic drag, enhancing thrust during takeoff, or reducing lift at low speeds do not align with the purpose of vortex generators. The intention behind these devices is to optimize lift and control flow rather than to create any negative effects associated with drag or reduced lift.