What airfoil design does the MQ-9 Reaper UAV use? Alternatively, what similar airfoil designs exist?
I'm running simulations for the effects of vortex generators for a school project and I would like to study the Reaper drones.
The wing root of the General Atomics RQ-9 is the Drela GW-19/GW-25.
The wing tip airfoil is the Drela GW-27.
Because of their application, you will likely have difficulty finding study results of vortex generators used on that blended airfoil. There are papers, but I have only seen them in the DTIC library, and I do not recall the classification of them. However, the aircraft has been exported, so you may find some open literature on the airfoil, and the adaptations and optimization of it.
Similar airfoil if you go higher Reynolds number is NLF 1015 and NASA LRN 1015. One paper specifically investigated what you have suggested above is this.
AIAA-2003-0211 Enhanced Airfoil Design Incorporating Boundary Layer Mixing Devices Michael Kerho and Brian Kramer
On the original airfoil design without vortex generators.
THE DESIGN. OF AN AIRFOIL. FOR. A HIGH-ALTITUDE,. LONG-ENDURANCE. REMOTELY. PILOTED. VEHICLE. N9 0- 12 545. Mark. D. Maughmer.