In this paper, JT15D turbofan engine and its main subcomponents are assessed with the aviation, energy, exergy, environmental, and sustainability analyses. In the first stage, the system's specific thrust and specific fuel consumption of the engine are found as 315.9 N s/kg and 15.8 g/kN.s, respectively. Then, system's energetic efficiency is estimated as 21.15% and exergetic efficiency is accounted to be 19.919%. The system's exergetic improvement potential rate, productivity lack ratio and fuel exergy waste ratio are determined as 1573.535 kW, 402.024% and 80.081%, respectively. The ecological and environmental effect factors of the turbofan system are computed to be 5.020 and 4.020, respectively, while the sustainable efficiency factor and exergetic sustainability index rates are found as 1.249 and 0.249, respectively. Finally, among the system parts, the Combustion Chamber (CC) has minimum rates of sustainable efficiency factor, exergetic efficiency and sustainability index, while it has utmost rates of ecological and environmental effect factors, fuel exergy waste ratio, irreversibility and productivity lack ratios. As a general conclusion, the combustion chamber and low pressure compressor components should be optimized for better performance of the system.

本文对 JT15D 涡扇发动机及其主要子部件进行了航空、能源、火用、环境和可持续性分析。在第一阶段，发动机的系统比推力和比油耗分别为315.9 N s/kg和15.8 g/kN.s。那么，系统的能量效率估计为21.15%，火用效率占19.919%。该系统的火用改进潜力率、产能不足率和燃料火用浪费率分别确定为1573.535 kW、402.024%和80.081%。计算得出涡扇系统的生态和环境影响因子分别为 5.020 和 4.020，而可持续效率因子和火用可持续性指数分别为 1.249 和 0.249。最后，在系统部件中，燃烧室（CC）的可持续效率因子、火用效率和可持续性指数的比率最低，而生态环境影响因子、燃料火用浪费率、不可逆性和生产力缺乏率的比率最高。作为一般结论，燃烧室和低压压缩机组件应该优化以提高系统性能。