Keywords: bypass air engines, second law analysis, engineering education, turbo fan air engines, external losses, irreversible losses, second law of thermodynamics, aircraft engines, bypass ratio, thermomechanical exergy destruction, exhaust stream
External losses in high-bypass turbo fan air engines
The external irreversible losses of air engines, due to equilibration of the hot and fast exhaust with the environment, are discussed based on the second law of thermodynamics. The effect of the bypass ratio on thermomechanical exergy destruction in the exhaust stream is demonstrated. The analysis gives a strong motivation for the use of high bypass turbo fan engines in modern aircraft.