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International Journal of Turbo & Jet-Engines

Ed. by Sherbaum, Valery / Erenburg, Vladimir

IMPACT FACTOR 2018: 0.863

CiteScore 2018: 0.66

SCImago Journal Rank (SJR) 2018: 0.211
Source Normalized Impact per Paper (SNIP) 2018: 0.625

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Volume 35, Issue 3


Entropy Generation Calculation of a Turbofan Engine: A Case of CFM56-7B

Mehmet Emin Cilgin / Onder Turan
Published Online: 2017-12-05 | DOI: https://doi.org/10.1515/tjj-2017-0053


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.

Keywords: energy; entropy; aircraft; turbofan; CFM56

PACS: (2010); entropy thermodynamics; 05.70.-a; Air transportation; 89.40.Dd; irreversible thermodynamics; 05.70.Ln; energy conservation in classical mechanics; 45.20.dh; thermal analysis; 81.70.Pg; thermodynamic considerations; 88.05.De


About the article

Received: 2017-11-02

Accepted: 2017-11-28

Published Online: 2017-12-05

Published in Print: 2018-07-26

Citation Information: International Journal of Turbo & Jet-Engines, Volume 35, Issue 3, Pages 217–227, ISSN (Online) 2191-0332, ISSN (Print) 0334-0082, DOI: https://doi.org/10.1515/tjj-2017-0053.

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