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

The primary purpose of wing-mounted vortex generators is to improve airflow and aileron effectiveness at high speeds. Vortex generators are small, aerodynamic devices installed on the wings of an aircraft to create controlled vortices that enhance airflow over the wing surfaces and control surfaces, especially at high angles of attack. By energizing the boundary layer of airflow, they help delay flow separation, allowing the wings and ailerons to maintain their effectiveness during high-speed maneuvers. This leads to improved handling and overall stability, which is crucial for maintaining aircraft performance and safety during flight.

The other options do touch on important aerodynamic concepts, but they don't directly address the specific function of vortex generators. For instance, while increasing lift at low speeds is important, vortex generators primarily focus on airflow characteristics and control surface effectiveness rather than lift enhancement alone. Reducing drag divergence and resetting stall characteristics are also significant, but these aspects are secondary effects resulting from the improved airflow management that vortex generators are designed to enhance.