Effects of Bypass Ratio Change Trend on Performance in a Military Aircraft Turbofan Engine With Comparative Assessment

AKDENİZ H. Y., Balli O.

JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME, vol.143, no.12, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 143 Issue: 12
  • Publication Date: 2021
  • Doi Number: 10.1115/1.4051297
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, Compendex, Computer & Applied Sciences, Environment Index, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Keywords: turbofan engine, bypass ratio, engine design, change trend, engine performance, energy conversion, systems, energy storage systems, energy systems analysis, heat energy generation, storage, transfer, bypass effects, EXERGY ANALYSIS, SUSTAINABILITY ANALYSIS, TURBOJET ENGINE, ENERGY, OPTIMIZATION, VEHICLE
  • Eskisehir Osmangazi University Affiliated: Yes


In this study, it is aimed to observe the bypass effects on energetic and exergetic performance in a JT3D-3B Military Aircraft Turbofan Engine and its components. For this aim, the comprehensive energy and exergy analyses are performed separately at the various bypass ratios: BPR: 1.30 (Case A), BPR: 1.34 (Case B), BPR: 1.38 (Case C), BPR: 1.40 (Case D), BPR: 1.42 (Case E), BPR: 1.45 (Case F), and BPR: 1.36 (original design). As per the performance results, while the energetic efficiency of the engine is found to be 27.93% for Case F, 27.85% for Case E, 27.72% for Case D, 27.60% for Case C, 27.17% for Case B, 26.97% for Case A, the exergetic efficiency of the engine is found to be 26.23% for Case F, 26.23% for Case E, 26.11% for Case D, 26.00% for Case C, 25.59% for Case B, and 25.39% for Case A, Furthermore, with the increase of bypass ratio step by step from 1.30 to 1.45, while the energetic efficiency, the exergetic efficiency, the relative exergy consumption value tends to increase, the fuel exergy waste ratio value, the productivity lack ratio, and exergetic improvement potential value of the overall engine tends to decrease. This study can be helpful for turbofan engine users, owners, and designers.