Enhanced dynamic exergy analysis of a micro-jet (μ-jet) engine at various modes

• Published in: Energy (Oxford) 2022-01, Vol.239, p.121911, Article 121911
• Main Authors: Balli, Ozgur, Aygun, Hakan, Turan, Onder
• Format: Article
• Language: English
• Subjects: Advance exergy; Combustion chambers; Destruction; Exergy; Microjet; Propulsion; Thermodynamics; Thrust; Turbojet; Turbomachinery
• ISSN: 0360-5442; 1873-6785
• DOI: 10.1016/j.energy.2021.121911

In the current study, advanced exergo-dynamic analysis of a micro-turbo jet (μ-jet) along with conventional exergy analysis is presented in various running shaft speed modes. In this context, major advanced exergetic indicators of μ-jet components are evaluated at the various running testing. The operation modes were represented as operation shaft speeds between 48,850 and 77,000 RPM (revolution per minute), while μ-jet produced within the range of 45.01–121.27 N thrust force in these modes. Improvement potentials of turbomachinery components and exergy destruction rates are calculated throughout the real-time testing modes. According to the analysis, the combustor has the lowest exergy efficiency ranging from 41.06% to 50.18%. Also, the study shows that the exergy efficiency values of the experimental μ-jet are found to be as 6.56% at Mode-1, 10.12% at Mode-2, 15.46% at Mode-3 and 17.02% at Mode-4, respectively. Other important findings for μ-jet are that unavoidable exergy destruction rate varies between 94.89% and 95.79%, while endogenous exergy destruction value changes between 89.79% and 91.47% in these modes. Thanks to the present analysis, the methods decreasing avoidable exergy destruction that changes between 4.21% and 5.11% could be focused. •Assessment of microjet engine system along with advanced exergy.•Various shaft speeds on advance exergy for micro-jet engine.•Endogenous/exogenous exergy destruction of micro-jet engine.•Mexogenousexergy destruction parts for micro-jet engine.