fan pressure ratio

The ratio of the fan discharge pressure to the fan inlet pressure.

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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.

Tradeoff Study between Cost and Environmental Impact of Aircraft Using Simultaneous Optimization of Airframe and Engine Cycle

Based on installed performance evaluation, this engine optimizes at a fan pressure ratio of 1.3 and a bypass ratio in the range of 12 to 13.The comparable open rotor engine has an effective "bypass ratio" level in excess of 20.

Next generation of transport Engines--very high bypass ratio turbofans vs open rotor engines

(1) is largely determined by bypass flow in a high bypass engine the fan pressure ratio (which could be 1.6 for a bypass ratio of 8:1) is the key parameter.

Featured column: as the turbine turns ... focus on fans

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