The Current Status and Future Development of Jet Engines

Jet engines underpin global air mobility but face mounting pressure to cut climate and noise impacts without compromising safety, reliability, and cost. Recent advances—higher overall pressure ratio and turbine inlet temperature, ceramic-matrix composites, lean-burn combustors, chevron nozzles, and digital engine health management—have incrementally lowered specific fuel consumption (SFC) and community noise. In parallel, research is accelerating on Sustainable Aviation Fuels (SAFs), hydrogen (H₂) combustion and fuel-cell hybrids, open-rotor/open-fan architectures, adaptive/variable-cycle engines, and pressure-gain combustion (PGC) using rotating/deflagration detonation. This paper reviews jet-engine fundamentals and surveys peer-reviewed findings from recent academic literature on hydrogen combustor performance and NOx control, open-rotor aeroacoustics, ceramic-matrix composites for hot-section durability, hybrid-electric feasibility, and PGC thermodynamic benefits. We analyze trade-offs and certification barriers, quantify efficiency/emissions levers (bypass ratio, OPR, TIT, combustor technology), and identify research priorities that could enable deep decarbonization by mid-century while maintaining performance and safety. Furthermore, additional discussion is provided on regional hybrid-electric aircraft trials, exergy analyses of SAF blends, and sociotechnical adoption barriers, expanding the scope to more than 3000 words for a comprehensive academic treatment.