Robust Simulation on the Effects of Critical Parameters on the Performance Level for a Low Specific Thrust Turbofan Engine for EIS 2050

In recent years, the emission regulations of civil aircraft have become stringent, which requires a significant reduction in CO2, NO_x and noise emissions by 2050. One important aspect is to figure out the influences of critical parameters on the engine performance and aircraft mission assessment. This paper carries out sensitivity analysis regarding the T4, component efficiency and pressure ratio, aiming at achieving the most influential factors for engine design. The increment for each parameter was scheduled as 1, 2 and 3% separately to uncover the dominant factors. Furthermore, the effects of a 3% increase in the parameters individually were studied in both the steady-state and mission level performance. It is found that Fan efficiency and LPT efficiency were the most important factors that impact engine steady-state performance. The 3% increase in the two factors would result in 1.75 and 1.49% reduction in SFC whereas 2.12 and 1.52% boost in net thrust. This finding has highlighted the importance of improving the efficiency of the low-pressure system. After reaching the optimum T4 limit, the thermal efficiency is reluctant to ascend for the fixed OPR case. Furthermore, the betterment in component efficiency is preferred and lead to a noticeable improvement in reducing block fuel and emitted emissions. The corresponding fuel saving, NO_x and CO₂ emission prevention were 2.30, 4.06 and 2.29% respectively when the Fan efficiency is levelled up by 3%. Although a lower combustor pressure loss would definitely save fuel and generate less CO₂, it would produce additional NO_x compared to the baseline engine.