A turboprop engine is a type of aircraft propulsion system that combines a gas turbine engine (similar to a turbojet or turbofan) with a propeller. The gas turbine, or jet engine component, generates shaft power, which is used to drive the propeller. The thrust force of a turboprop engine is generated by the combination of the jet thrust produced by the gas turbine and the additional thrust generated by the rotation of the propeller.
The thrust force of a turboprop engine is the forward force produced by the combination of the jet thrust and the thrust generated by the propeller. The gas turbine engine provides the high-speed exhaust gases that contribute to the jet thrust, while the rotating propeller acts as an airfoil, generating additional thrust by accelerating air through its blades.
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).