Micro Turbojet Thrust Reverser

BACKGROUND

Current micro-turbojets lack the ability to reverse thrust, making it more difficult to decelerate after landing and handle rejected takeoffs. Additionally, overall maneuverability of the aircraft is much lower without reverse thrusting capabilities, making it difficult to brake or descend. By adding thrust reversal, these micro-turbojets can exhibit greater flexibility in practical applications, such as landing on short or unpaved landing strips. It could also influence innovation in several unique types of air and ground vehicles. Unmanned Aerial Systems (UAS) platforms could benefit from thrust reversal capabilities while deployed in critical missions. They could even be utilized for military-based jetpacks or jet-powered cars, such as go-karts. Innovation to practically incorporate reverse thrusting to currently active micro turbojets could transform small vehicle capabilities and markets.

SUMMARY OF TECHNOLOGY

Researchers at Oklahoma State University have developed a thrust reverser retro fit kit that bolts on to a micro-turbojet, replacing a stock converging exhaust nozzle. The novel exhaust nozzle redirects exhaust flow to switch between forward and reverse thrust operations with optimized flow areas that increase performance over stock nozzles. The design utilizes a duct system that turns a door when actuated, blocking flow in one direction and achieving reverse thrust. Motors and gear assemblies used to actuate the door are strategically mounted to avoid any of the components overheating. Using this exhaust nozzle can produce over 40% reverse thrust based on the Thrust/Weight ratio of normal engine operation. Ultimately, implementing the exhaust nozzle design on to existing micro-turbojets adds several capabilities, such as shorter take-offs and landing, enhanced maneuverability, and safer descent, making them well equipped for more challenging tasks.

POTENTIAL AREAS OF APPLICATION

• Increased small vehicle power and auxiliary power availability (target drones, emergency payload delivery UAVs, military, humanitarian and commercial UAS, all-terrain vehicles, jetpacks)
• Provide exhaust flow to on-board components such as fans to provide lift or an alternator to recover energy
• Demanding maneuverability applications in Intelligence, Surveillance, Reconnaissance (ISR) or Tactical Resupply

MAIN ADVANTAGES

• Allow micro turbojets the ability to implement reverse thrust once only available in larger counterparts
• Easy installation retro fit kit to existing micro turbojets
• Increased maneuverability and vehicle control precision of small vehicles through improved deceleration

STAGE OF DEVELOPMENT

• Proof of Concept