International Scientific Journal


An exergy analysis is reported of a J85-GE-21 turbojet engine and its components for two altitudes: sea level and 11,000 meters. The turbojet engine with afterburning operates on the Brayton cycle and includes six main parts: diffuser, compressor, combustion chamber, turbine, afterburner and nozzle. Aircraft data are utilized in the analysis with simulation data. The highest component exergy efficiency at sea level is observed to be for the compressor, at 96.7%, followed by the nozzle and turbine with exergy efficiencies of 93.7 and 92.3%, respectively. At both considered heights, reducing of engine intake air speed leads to a reduction in the exergy efficiencies of all engine components and overall engine. The exergy efficiency of the turbojet engine is found to decrease by 0.45% for every 1°C increase in inlet air temperature.
PAPER REVISED: 2012-04-13
PAPER ACCEPTED: 2012-08-24
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THERMAL SCIENCE YEAR 2013, VOLUME 17, ISSUE Issue 4, PAGES [1181 - 1194]
  1. Amati, V., Bruno, C., Simone, D. and Sciubba, E. (2008) ‘Exergy analysis of hypersonic propulsion systems: Performance comparison of two different scramjet configurations at cruise conditions', Energy: An International Journal, Vol. 33, pp.116-129.
  2. Balli, O., Aras, H., Aras, N. and Hepbasli, A. (2004) ‘Exergetic and exergoeconomic analysis of an aircraft jet engine (AJE)', International Journal of Exergy, Vol. 5, No. 6, pp. 567-581.
  3. Bejan A. (1998) Advanced Engineering Thermodynamics, John Wiley & Sons, New York.
  4. Bejan, A., Tsatsaronis, G. and Moran, M.J. (1998) Thermal Design and Optimization, John Wiley & Sons, New York.
  5. Bejan, A. and Siems, D.L. (2001) 'The need for exergy analysis and thermodynamic optimization and aircraft development', International Journal of Exergy, Vol. 1, No. 1, pp.14-24.
  6. Brilliant, H.M. (1995) ‘Analysis of scramjet engines using exergy methods', AIAA paper 95-2767.
  7. Curran, E.T. (1973) 'The use of stream thrust concepts for the approximate evaluation of hypersonic ramjet engine performance', US Air Force Aero Propulsion Laboratory, Report AFAPL-TR-73-38, Wright-Patterson Air Force Base, OH.
  8. Dagaut, B. and Cathonnet, P. (2006) 'The ignition, oxidation and combustion of kerosene: A review of experimental and kinetic modeling', Progress in Energy and Combustion Science, Vol. 32, No. 1, pp. 48-92.
  9. Dinçer I. and Rosen, M.A. (2007) Exergy: Energy, Environment, and Sustainable Development, Elsevier, Oxford.
  10. Gaggioli, R.A. and Paulus, J.D. (2003) ‘The exergy of lift, and aircraft exergy flow diagrams', International Journal of Thermodynamics, Vol. 6, No. 4, pp. 149-156.
  11. Horlock, J. (1999) ‘Thermodynamic availability and propulsion', AIAA paper 99-741.
  12. Hunt, L., Cummings, M. and Giles, B. (1999a) ‘Wake integration for three dimensional flow field computations: Theoretical development', Journal of Aircraft, Vol. 36, No. 2, pp. 357-365.
  13. Hunt, L., Cummings, M. and Giles, B. (1999b) ‘Wake integration for three dimensional flow field computations: Application' Journal of Aircraft, Vol. 36, No. 2, pp. 366-373.
  14. Karakoc, H., Turgut, E., Hepbasli, A. (2006) ‘Exergetic analysis of an aircraft turbofan engine', Proceedings Summer Course on Exergy and its Applications, Anadolu University, Eskisehir, August, Turkey, pp. 14-16.
  15. Moorhouse, D.J. and Hoke, C.M. (2002) ‘Thermal analysis of hypersonic inlet flow with exergy-based design methods', International Journal of Applied Thermodynamics, Vol. 5, No. 4, pp. 161-168.
  16. Northrop Co. (1978) Technical Order of Aircraft 1F-5E/F, Report.
  17. Rancruel, D.F. and Von Spakovsky, M.R. (2003) ‘Decomposition with thermoeconomic isolation applied to the optimal synthesis/design of an advanced fighter aircraft system', International Journal of Thermodynamics, Vol. 6, No. 3, pp. 121-129.
  18. Riggins, D. and McClinton, C. (1995) ‘Thrust modeling for hypersonic engines', AIAA paper 95-6081.
  19. Riggins, D.W. (1996a) ‘High-Speed Engine/Component Performance Assessment Using Exergy and Thrust-Based Methods', report NASA-CR-198271, National Aeronautics and Space Administration, Langley Research Center, Hampton, VA.
  20. Riggins, D.W. (1996b) ‘The evaluation of performance losses in multi-dimensional propulsive flows', AIAA paper 96-0375.
  21. Riggins, D.W. (1996c) ‘Brayton cycle engine/component performance assessment using energy and thrust-based methods', AIAA paper 96-2922.
  22. Riggins, D.W. (1997) ‘Evaluation of performance loss methods for high-speed engines and engine components', Journal of Propulsion and Power, Vol. 13, No. 2, pp. 296-304.
  23. Riggins, D. (2003) ‘The thermodynamic continuum of jet engine performance: The principle of lost work due to irreversibility in aerospace system', International Journal of Thermodynamics, Vol. 6, No. 3, pp. 107-120.
  24. Riggins, D., Taylor, T. and Moorhouse, D.J. (2006) ‘Methodology for the performance analysis of aerospace vehicles using the laws of thermodynamics' Journal of Aircraft, Vol. 43, No. 4, pp. 953-963.
  25. Rosen, M.A. and Etele, J. (1999) ‘The impact of reference environment selection on the exergy efficiencies of aerospace engines', ASME Advanced Energy System, Vol. 39, pp. 583-591.
  26. Rosen, M.A. and Etele, J. (2004) ‘Aerospace system and exergy analysis: Application and methodology development needs', International Journal of Exergy, Vol. 1, No. 4, pp. 411-425.
  27. Sochet, I. and Gillard, P. (2002) ‘Flammability of kerosene in civil and military aviation', Journal of Loss Prevention in the Process Industries, Vol. 5, No. 3, pp. 335-345.
  28. Turgut, E.T., Karakoc, T.H. and Hepbasli, A. (2009a) ‘Exergoeconomic analysis of an aircraft turbofan engine', International Journal of Exergy, Vol. 6, No. 3, pp. 277-294.
  29. Turgut, E.T., Karakoc, T.H., Hepbasli, A. and Rosen, M.A. (2009b) ‘Exergy analysis of a turbofan aircraft engine'. International Journal of Exergy, Vol. 6, No. 2, pp. 181-199.

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