Title: External losses in high-bypass turbo fan air engines

Authors: Henning Struchtrup, Gwynn J. Elfring

Addresses: ETH Zurich, Department of Materials, Polymer Physics, HCI H 539, CH-8093 Zurich, Switzerland; Department of Mechanical Engineering, University of Victoria, P.O. Box STN CSC 3055, Victoria BC V8W 3P6, Canada. ' Department of Mechanical Engineering, University of Victoria, P.O. Box STN CSC 3055, Victoria BC V8W 3P6, Canada

Abstract: 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.

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.

DOI: 10.1504/IJEX.2008.019112

International Journal of Exergy, 2008 Vol.5 No.4, pp.400 - 412

Published online: 29 Jun 2008 *

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