Jet Engine Performance - Thrust

Thrust

The thrust from a jet engine is determined by the velocity of exhaust gases measured relative to the engine.

The velocity of the exhaust gas as it leaves a jet engine is :


where

is the specific enthalpy of the gas leaving the turbine and entering the propelling nozzle
is the specific enthalpy of the gas after it has left the propelling nozzle


Alternatively, is related to the temperatures of the exhaust gas:


where

is the specific heat of exhaust gas at constant pressure
is the temperature of the gas leaving the turbine and entering the propelling nozzle
is the temperature of the gas after it has left the propelling nozzle


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