Entropy Generation Calculation of a Turbofan Engine: A Case of CFM56-7B
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Mehmet Emin Cilgin
Abstract
Entropy generation and energy efficiency of turbofan engines become greater concern in recent years caused by rises fuel costs and as well as environmental impact of aviation emissions. This study describes calculation of entropy generation for a two-spool CFM56-7B high-bypass turbofan widely used on short to medium range, narrow body aircrafts. Entropy generation and power analyses are performed for five main engine components obtaining temperature-entropy, entropy-enthalpy, pressure-volume diagrams at ≈121 kN take-off thrust force. In the study, maximum entropy production is determined to be 0.8504 kJ/kg K at the combustor, while minimum entropy generation is observed at the low pressure compressor component with the value of 0.0025 kJ/kg K. Besides, overall efficiency of the turbofan is determined to be 14 %, while propulsive and thermal efficiencies of the engine are 35 % and 40 %, respectively. As a conclusion, this study aims to show increase of entropy due to irreversibilities and produced power dimension in engine components for commercial turbofans and aero-derivative cogeneration power plants.
Acknowledgements
Authors would like to thanks Anadolu University in Turkey for financial, technical support. This study was supported by Anadolu University Scientific Research Projects Commission under the grant no: 1606F560.
References
1. IATA. 2016. Fact sheet economic and social benefits of air transport. Accessed December 15. http://www.iata.org/pressroom/facts_figures/fact_sheets/Documents/fact-sheet-economic-and-social-benefits-of-air-transport.pdfSuche in Google Scholar
2. Airbus Company. 2016. Global market forecast. Accessed November 10. http://www.airbus.com/company/market/forecast/Suche in Google Scholar
3. Boeing. 2016. Current market outlook 2016-2035. Accessed November 10. http://www.boeing.com/resources/boeingdotcom/commercial/about-our-market/assets/downloads/cmo_print_2016_final_updated.pdfSuche in Google Scholar
4. ICAO. 2016. 2016 environmental report. Accessed December 15. http://www.icao.int/environmental-protection/Documents/ICAO%20Environmental%20Report%202016.pdfSuche in Google Scholar
5. Balli O. Afterburning effect on the energetic and exergetic performance of an experimental turbojet engine (tje). Int J Exergy. 2014;14:212–43.10.1504/IJEX.2014.060278Suche in Google Scholar
6. Aydin H, Turan O, Midilli A, Karakoc TH. Exergetic and exergo-economic analysis of a turboprop engine: A case study for CT7-9C. Int J Exergy. 2012;11:69–88.10.1504/IJEX.2012.049089Suche in Google Scholar
7. Aydin H, Turan O, Midilli A, Karakoc TH. Energetic and exergetic performance assessment of a turboprop engine at various loads. Int J Exergy. 2013;13:543–64.10.1504/IJEX.2013.058107Suche in Google Scholar
8. Tona C, Raviolo PA, Pellegrini LF, De Oliveira Júnior S. Exergy and thermoeconomic analysis of a turbofan engine during a typical commercial flight. Energy. 2010;35:952–59.10.1016/j.energy.2009.06.052Suche in Google Scholar
9. Turan O. Effect of reference altitudes for a turbofan engine with the aid of specific-exergy based method. Int J Exergy. 2012;11:252–70.10.1504/IJEX.2012.049738Suche in Google Scholar
10. Aydin H, Turan O, Karakoc TH, Midilli A. Sustainability assessment of pw6000 turbofan engine: an exergetic approach. Int J Exergy. 2014;14:388–412.10.1504/IJEX.2014.061025Suche in Google Scholar
11. Turan O. An exergy way to quantify sustainability metrics for a high bypass turbofan engine. Energy. 2015;86:722–36.10.1016/j.energy.2015.04.026Suche in Google Scholar
12. Turan O, Aydin H. Exergy-based sustainability analysis of a low-bypass turbofan engine: A case study for JT8D. Energy Procedia. 2016;95:499–506.10.1016/j.egypro.2016.09.075Suche in Google Scholar
13. Tanbay T, Durmayaz A, Sogut OS. Exergy-based ecological optimisation of a turbofan engine. Int J Exergy. 2015;16:358–81.10.1504/IJEX.2015.068231Suche in Google Scholar
14. Colakoglu M, Tanbay T, Durmayaz A, Sogut OS. Effect of heat leakage on the performance of a twin-spool turbofan engine. Int J Exergy. 2016;19:173–98.10.1504/IJEX.2016.075604Suche in Google Scholar
15. McGilvray M, Morgan RG. Effects of upstream injection on scramjet performance using an entropy-based method. J Propulsion Power. 2009;25:295–302.10.2514/1.38325Suche in Google Scholar
16. Turan O, Aydin H. Exergetic and exergo-economic analyses of an aero-derivative gas turbine engine. Energy. 2014;74:638–50.10.1016/j.energy.2014.07.029Suche in Google Scholar
17. Turan O, Aydın H. Numerical calculation of energy and exergy flows of a turboshaft engine for power generation and helicopter applications. Energy. 2016;115:914–23.10.1016/j.energy.2016.09.070Suche in Google Scholar
18. Balli O. Advanced exergy analysis of a turbofan engine (TFE): splitting exergy destruction into unavoidable/avoidable and endogenous/exogenous. Int J Turbo Jet Engines. 2017. DOI:10.1515/tjj-2016-0074Suche in Google Scholar
19. Andriani R, Gamma F, Ghezzi U. Numerical analysis of intercooled and recuperated turbofan engine. Int J Turbo Jet Engines. 2011;28:139–46.10.1515/tjj.2011.013Suche in Google Scholar
20. Bejan A. Entropy generation minimization: the new thermodynamics of finite‐size devices and finite‐time processes. J Appl Phys. 1996;79:1191–218.10.1063/1.362674Suche in Google Scholar
21. Cengel YA, Boles MA. Thermodynamics: an engineering approach, 8th ed. New York: McGraw-Hill Education, 2015.Suche in Google Scholar
22. Bejan A. Entropy generation minimization: the method of thermodynamic optimization of finite-size systems and finite-time processes. Boca Raton: CRC Press, 1996.Suche in Google Scholar
23. De Oliveira JS. Exergy: production, cost and renewability. In: Green, energy and technology. London: Springer, 2013:63.10.1007/978-1-4471-4165-5Suche in Google Scholar
24. Aydin H, Turan O, Karakoc TH, Midilli A. Component-based exergetic measures of an experimental turboprop/turboshaft engine for propeller aircrafts and helicopters. Int J Exergy. 2012;11:322–48.10.1504/IJEX.2012.050228Suche in Google Scholar
25. Dincer I, Hussain MM, Al-Zaharnah I. Energy and exergy use in public and private sector of Saudi Arabia. Energy Policy. 2004;32:1615–24.10.1016/S0301-4215(03)00132-0Suche in Google Scholar
26. Bejan A, Tsatsaronis G, Moran MJ. Thermal design and optimization. New York: Wiley, 1996.Suche in Google Scholar
27. Dincer I, Cengel YA. Energy, entropy and exergy concepts and their roles in thermal engineering. Entropy. 2001;3:116–49.10.3390/e3030116Suche in Google Scholar
28. Hepbasli A. A key review on exergetic analysis and assessment of renewable energy resources for a sustainable future. Renewable Sustainable Energy Rev. 2008;12:593–661.10.1016/j.rser.2006.10.001Suche in Google Scholar
29. El-Sayed AF. Aircraft propulsion and gas turbine engines. Boca Raton: CRC Press; 2014.Suche in Google Scholar
30. Farokhi S. Aircraft propulsion, 2nd ed. Chichester, West Sussex: Wiley, 2014.Suche in Google Scholar
31. Turan O. Energy and entropy analyses of an experimental turbojet engine for target drone application. Anadolu Univ J Sci Technol Appl Sci Eng. 2016;17:936–936.10.18038/aubtda.279861Suche in Google Scholar
32. Aydin H, Turan O, Karakoc TH, Midilli A. Exergetic sustainability indicators as a tool in commercial aircraft: A case study for a turbofan engine. Int J Green Energy. 2015;12:28–40.10.1080/15435075.2014.889004Suche in Google Scholar
33. Yilmaz I. Evaluation of the relationship between exhaust gas temperature and operational parameters in CFM56-7B engines. Proc Inst Mech Eng, Part G: J Aerospace Eng. 2009;223:433–40.10.1243/09544100JAERO474Suche in Google Scholar
34. Kurzke J. Gasturb12, 2012. Availabe at: http://www.gasturb.de/the-program.html. Accessed: 2 Dec 2016.Suche in Google Scholar
© 2018 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Original Research Articles
- The Effect of Pulsed Injection on Supersonic Shear Layer Mixing in a Scramjet Combustor
- Entropy Generation Calculation of a Turbofan Engine: A Case of CFM56-7B
- Separation Control by Slot Jet in a Critically Loaded Compressor Cascade
- An Impingement Cooling Using Swirling Jets Induced by Helical Rod Swirl Generators
- Studies on Stepped Air Ejector Diffusers incorporating Heat Transfer Effects
- Assessment of Analytical Predictions for Radial Growth of Rotating Labyrinth Seals
- Ground Simulation of High Altitude Test of Turbo-Refrigeration Cycle
- Investigations on the Film Cooling of Counter-Inclined Film-Hole Row Structures for Turbine Vane Leading Edge
Artikel in diesem Heft
- Frontmatter
- Original Research Articles
- The Effect of Pulsed Injection on Supersonic Shear Layer Mixing in a Scramjet Combustor
- Entropy Generation Calculation of a Turbofan Engine: A Case of CFM56-7B
- Separation Control by Slot Jet in a Critically Loaded Compressor Cascade
- An Impingement Cooling Using Swirling Jets Induced by Helical Rod Swirl Generators
- Studies on Stepped Air Ejector Diffusers incorporating Heat Transfer Effects
- Assessment of Analytical Predictions for Radial Growth of Rotating Labyrinth Seals
- Ground Simulation of High Altitude Test of Turbo-Refrigeration Cycle
- Investigations on the Film Cooling of Counter-Inclined Film-Hole Row Structures for Turbine Vane Leading Edge
