Steady-state aircraft engine: In a jet engine, air enters from the fornt, fuel is added farther downstream in the engine, and the fuel and air burn. Thrust is produced when the gases leave the engine through a nozzle at high velocty. Consider a case where a jet engine is being tested on the ground. It is operating at steady-state and burning 0.25 kg/s of jet fuel. The velocity (v) and temperature (T) profiles of the gases exiting the round nozzle have been measured, and are found to depend only on the radial distance (r) from the center of the nozzle – they are not dependent on the azimuthal position around the nozzle.