The total energy at the exit of a nozzle for a turbojet engine consists of kinetic energy and potential energy. The total energy per unit mass is the sum of the enthalpy and kinetic energy at the exit of the nozzle.
The total energy () at the nozzle exit can be expressed as:
where,
- E is the Total Energy, i.e sum of kinetic and potential energy
- is the static enthalpy at the nozzle exit,
- is the velocity of the exhaust gases relative to the reference frame of the exhaust gases