Keywords: aerospace engines, turbojets, reference environment, exergy loss, efficiency, exhaust emission
Exergy losses for aerospace engines: effect of reference-environment on assessment accuracy
The effects of reference environment on exergy losses of a turbojet are examined, considering a variable and two constant reference environments. The percentage of the total exergy loss due to the exhaust emission increases from 65% at sea level to 70% at 15,000 m, while the composition of this loss remains nearly constant with altitude. Exergy losses are strongly dependent on reference environment. The magnitude of the exhaust loss varies by up to 18% from the actual value when using a constant reference-environment model. The breakdown of this loss for a constant reference environment varies by up to 28%.