Variable Lower bound Baseline Wing area ([m.sup.2]) 300 355.49 Wing sweep ([degrees]) 27 32.4 Wing aspect ratio 8 10.4672 Wing taper ratio 0.1 0.1062 Thickness to chord ratio at wing root 0.11 0.135 Maximum takeoff thrust (kN) 280 334 Engine bypass ratio 8 11
Fan pressure ratio 1.5 1.58 Low-pressure compressor pressure ratio 2.5 3.2 Overall pressure ratio 40 52 Turbine inlet temperature (K) 1650 1800 Variable Upper bound Wing area ([m.sup.2]) 400 Wing sweep ([degrees]) 36 Wing aspect ratio 13 Wing taper ratio 0.12 Thickness to chord ratio at wing root 0.15 Maximum takeoff thrust (kN) 420 Engine bypass ratio 15
Fan pressure ratio 1.75 Low-pressure compressor pressure ratio 4.5 Overall pressure ratio 60 Turbine inlet temperature (K) 1900 Table 4: Optimization problem constraints.