The Rolls Royce Olympus 593 is a jet engine that was used in the Concorde supersonic airliner. The engine is a turbojet and is part of the broader family of turbofan engines. Unlike turbofans, which have a bypass ratio (the ratio of air that bypasses the engine core to the air that goes through the core) greater than 1, the Olympus 593 is a low-bypass turbojet.
For turbojet and low-bypass turbofan engines, the thrust force is primarily generated by the acceleration of air through the engine and the subsequent expulsion of high-speed exhaust gases.
The thrust equation for a turbojet engine using control volume analysis is expressed as:
where,
- is the thrust force,
- ṁe is the mass flow rate of exhaust gases in kilograms per second (kg/s).
- is the Exhaust velocity at the nozzle exit in meters per second (m/s).
- ṁ0 is the mass flow rate of inlet gases in kilograms per second (kg/s).
- is the Exhaust velocity at the nozzle Inlet in meters per second (m/s).
- is the Pressure at the nozzle exit in pascals (Pa).
- is the Pressure at the nozzle inlet in pascals (Pa).
- is the Area of the nozzle exit in square meters (m²).