| Popis: |
Over the past few years, pressure to reduce the overall fuel consumption of the commercial aircraft eet has been growing steadily. Expenses related to fuel are now one of the largest contributors to an airline’s direct operating cost. In addition, harmful emissions derived from the engine combustion process (CO2, NOx, and others) must be signicantly reduced in order to meet future targets that the industry has set for itself. The fuel burn impact of varying design mission specications (payload, range, cruise Mach number, and allowable span) of tube and wing aircraft is studied in this paper. Representative aircraft from all groups (Regional Jet - CRJ900, Single Aisle- B737-800, Small Twin Aisle- B767300ER, Large Twin Aisle- B777-200ER, and Large Aircraft - B747-400) are chosen and redesigned for variations in the design cruise Mach number, wing span and R1 range. In addition, the eects of improvements in aerodynamic, structural and propulsion technology expected over the next 20 years are taken into account in the context of technology scenarios for which the baseline aircraft are redesigned. The eectiveness of mission specication changes in reducing the fuel burn of these technologically advanced aircraft is also observed. Results from aircraft redesigns indicate that variations in design mission specications can result in aircraft with improved fuel burn characteristics (up to a 24 percent reduction). Results also indicate that even for aircraft at higher technology levels, mission specication changes can still contribute to signicant improvement in aircraft performance. |
