Burak YukselOzgur BalliHuseyin GunerhanArif Hepbasli2025-10-0620201996-107310.3390/en13051205http://dx.doi.org/10.3390/en13051205https://gcris.yasar.edu.tr/handle/123456789/7357This study dealt with evaluating the (J85-GE-5H) military turbojet engine (TJE) in terms of exergetic and advanced exergetic analyses at Military (MIL) and Afterburner (AB) process modes by utilizing kerosene (JP-8) and hydrogen (H-2) fuels. First exergy and advanced exergy analyses of the engine were performed using JP-8 fuel as per actual engine operating conditions. These analyses of the turbojet engine using hydrogen fuel were also examined parametrically. The performance evaluation of the engine was lastly executed by comparing the obtained results for both fuels. Based on the parametric studies undertaken the entire engine's exergetic efficiency with JP-8 was reckoned 30.85% at the MIL process mode while it was calculated as 16.98% at the AB process mode. With the usage of H-2 the efficiencies of the engine decreased to 28.62% and 15.33% for the above mentioned two modes respectively. As the supreme exergy destructions occurred in the combustion chamber (CC) and afterburner exhaust duct (ABED) segments the new technological developments should be considered to design more efficient engines. As a result the engine worked less efficiently with hydrogen fuel due to the enhancement in exergy destructions. Conversely the greenhouse gas (GHG) emission parameters lessened with the utilization of H-2 fuel.Englishturbojet engine, exergetic analysis, advanced exergetic analysis, performance evaluation, exergy efficiency, improved exergy efficiency, H-2 fuelTURBOPROP ENGINE, AIRCRAFT, SUSTAINABILITY, CYCLE, HEAT, DESTRUCTIONS, POWER, FUTURE, ENERGY, COSTArticle