BACKGROUND
As the performance of small, high-speed aircraft continues to advance, the demand for efficient power systems becomes increasingly critical. Systems on aircraft such as navigation, communication, and flight control are all vital for successful operations. Advancements in military aircraft technology continue to grow in areas such as radar and weapons systems. Even consumer use of UAVs and drones is requiring expanded logistical operations and situational awareness during autonomous flight. As power supply demands grow, the need for efficient, mobile power sources grows. A solution to generate onboard power efficiently for aircraft operation is nearing essential, especially in aircraft that utilize small engines that do not offer powered take-off.
SUMMARY OF TECHNOLOGY
Researchers at Oklahoma State University have designed and prototyped an attachment to a compact jet turbine engine, like a stock JetCat P100RX, that can efficiently extract mechanical energy from the exhaust air flow and convert it into electrical power. Due to the mass flowrate and air speed velocity of the exhaust airflow, the design improvement has minimal effect on the engine’s performance. Additionally, the thrust to weight ratio (T/W) was maximized so that any existing high-speed aircraft powered by a similar compact jet turbine can expect the benefit of electrical power and similar performance. The prototype design integrates a power turbine within the nozzle that is connected to a generator through a gear box. Exhaust flow spools up the turbine allowing the generator to produce an AC current. A nonlinear aerospike was chosen for the design of the nozzle to prevent flow separation and unsmooth pressure gradients, as well as allowing for more centralized pressure from the exhaust. The cut tip of the aerospike prevents pressure build. Lastly, the turbine mechanical energy is converted to electrical power using a combination of an electrical generator and motor. The prototype can output more than 500 Watts of power at full throttle.
POTENTIAL AREAS OF APPLICATION
- Small engine manufacturers that do not offer power take-off
- Military compact, high-speed aircraft
- Consumer autonomous devices
- Mobile power
MAIN ADVANTAGES
- Free power
- Adaptable: Easily attachment for stock high-speed aircraft power systems (i.e. JetCat P100RX)
- Non-Intrusive: Minimal effects on performance of high-speed aircraft
- Tested performance 500 Watts
STAGE OF DEVELOPMENT
