The SABRE (Synergistic Air-Breathing Rocket Engine) is a propulsion concept designed for space launch vehicles. It is being developed by Reaction Engines Limited. SABRE is a unique engine that combines air-breathing and rocket propulsion in a single system. Its air-breathing mode operates in the atmosphere like a jet engine, while it transitions to a rocket mode in the vacuum of space.
The propulsive efficiency is a crucial parameter in evaluating the performance of a rocket engine, indicating how well it converts propellant energy into useful thrust. Practical rocket engines often have propulsive efficiencies less than 100% due to factors like incomplete combustion, heat losses, and other inefficiencies in the propulsion system.
The propulsive efficiency () is defined by the following formula:
where,
- is the propulsive efficiency,
- is the thrust produced by the rocket engine,
- is the effective exhaust velocity of the rocket,
- ṁp is the mass flow rate of the propellants,
- is the specific impulse of the rocket engine,
- g0 is the acceleration due to gravity (approximately 9.81 m/s²).