GE XA100, three-stream adaptive cycle design: GE and BAE Systems collaborate to explore next generation adaptive power systems for Combat Air application

The XA100 engine is described as a three-stream adaptive cycle design. It can direct air into the bypass third stream for increased either fuel efficiency or cooling or to the core and fan streams for additional thrust and performance.

 https://www.geaviation.com/press-release/systems/ge-and-bae-systems-collaborate-explore-next-generation-adaptive-power-systems

https://youtu.be/5PLjjCS4V-A

https://www.geaviation.com/propulsion/military/xa100