Exergy Analysis of a Turbojet Engine Modeled as a Lumped Parameter System


The application of exergy performance analysis to the transient operation of a singlespool turbojet engine is studied. This work determines under what conditions the steady exergy analysis methods can be successfully applied to the transient operation of a turbojet engine. The engine is modeled using cycle analysis with compressor and turbine maps for off-design component performance. The engine's transients are modeled with the use of plenum volumes. By applying an exergy balance, with the inclusion of the critical wake analysis, to the system, the engine thrust is related directly to the rate of entropy generation in the system. Three types of transient events are studied and include: a) throttling, b) power extraction from the turbine and c) engine acceleration. The results show that for physically possible transient maneuvers, the engine thrust calculated using the steady exergy methods tracks the actual thrust during transients.

Meeting Name

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition (2012: Jan. 9-12, Nashville, TN)


Mechanical and Aerospace Engineering

Document Type

Article - Conference proceedings

Document Version


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© 2012 American Institute of Aeronautics and Astronautics (AIAA), All rights reserved.

Publication Date

12 Jan 2012