// PROPULSION SYSTEMS AND ENGINE TECHNOLOGY TERM
Combined Cycle Engine
A combined cycle engine is a type of aerospace engine that integrates multiple different propulsion systems to operate efficiently across a wide range of flight speeds, typically from subsonic to hypersonic velocities.
TECHNICAL DEFINITION
A combined cycle engine is an advanced aerospace propulsion system that strategically integrates and transitions between two or more distinct engine cycles, such as turbojets, ramjets, and scramjets, to optimize thrust and fuel efficiency across a broad flight envelope, including sustained hypersonic flight regimes.
BACKGROUND
A rotating detonation engine (RDE) uses a form of pressure gain combustion, where one or more detonations continuously travel around an annular channel. Computational simulations and experimental results have shown that the RDE has potential in transport and other applications.
READ MORE ON WIKIPEDIASYNONYMS & ALIASES
- Hybrid engine
- Multi-mode engine
- Variable cycle engine
- Integrated propulsion system
USAGE NOTE
These engines are crucial for next-generation high-speed aircraft and reusable space access vehicles, enabling operation from takeoff to hypersonic speeds with a single propulsion unit.
DEVELOPERS
Organizations developing technology related to Combined Cycle Engine.
Developing the Synergetic Air-Breathing Rocket Engine (SABRE), a combined cycle engine designed to operate as an air-breathing jet engine at low speeds and altitudes, and then transition to a rocket engine for space flight.
Through various research centers and programs, NASA investigates and develops advanced propulsion concepts, including hypersonic airbreathing and combined cycle engines for future high-speed aircraft and space access systems.
JAXA conducts research into future space transportation systems and hypersonic propulsion, including concepts like the ATREX (Air Turbo Ramjet Engine) which is a form of combined cycle engine.
DARPA funds and manages numerous advanced propulsion programs, particularly in hypersonic flight, which often involve the development and integration of combined cycle engine technologies.
As a major aerospace engine manufacturer, Rolls-Royce invests in research and development for future propulsion systems, including those that could leverage combined cycle architectures for high-speed flight or space launch applications.
GE Aerospace conducts extensive research in advanced propulsion technologies, including efforts related to hypersonic flight and adaptive engine designs that share principles with combined cycle engines for broad flight envelopes.
A leader in military and commercial engine development, Pratt & Whitney engages in research for advanced propulsion systems, including those capable of operating across a wide range of speeds and altitudes relevant to combined cycle engine applications.
While primarily known for rocket engines, Aerojet Rocketdyne has a history of developing hypersonic air-breathing propulsion systems, including ramjets and scramjets, which are critical components in many combined cycle engine concepts.