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It projects the following reductions in engine fuel consumption, compared to baseline aircraft in service in 2015: [126] 10-15% from higher pressure and bypass ratios, lighter materials, implemented in 2010–2019; 20-25% from high pressure core + ultra-high by-pass ratio geared turbofan, from ~2020-25; 30% from open rotors (propfans), from ~2030
Jet engine performance has been phrased as 'the end product that a jet engine company sells' [1] and, as such, criteria include thrust, (specific) fuel consumption, time between overhauls, power-to-weight ratio. Some major factors affecting efficiency include the engines overall pressure ratio, it's bypass ratio and the turbine inlet ...
For example, Concorde cruised at 1354 mph, or 7.15 million feet per hour, with its engines giving an SFC of 1.195 lb/(lbf·h) (see below); this means the engines transferred 5.98 million foot pounds per pound of fuel (17.9 MJ/kg), equivalent to an SFC of 0.50 lb/(lbf·h) for a subsonic aircraft flying at 570 mph, which would be better than even ...
The following table takes values as an example for the specific fuel consumption of several types of engines. For specific engines values can and often do differ from the table values shown below. Energy efficiency is based on a lower heating value of 42.7 MJ/kg (84.3 g/(kW⋅h)) for diesel fuel and jet fuel , 43.9 MJ/kg (82 g/(kW⋅h)) for ...
Aircraft engine performance refers to factors including thrust or shaft power for fuel consumed, weight, cost, outside dimensions and life. It includes meeting regulated environmental limits which apply to emissions of noise and chemical pollutants, and regulated safety aspects which require a design that can safely tolerate environmental hazards such as birds, rain, hail and icing conditions.
Fuel fraction is a key parameter in determining an aircraft's range, the distance it can fly without refueling. Breguet ’s aircraft range equation describes the relationship of range with airspeed , lift-to-drag ratio , specific fuel consumption , and the part of the total fuel fraction available for cruise, also known as the cruise fuel ...
The aircraft gross weight (also known as the all-up weight and abbreviated AUW) is the total aircraft weight at any moment during the flight or ground operation. [1] [2] [3]An aircraft's gross weight will decrease during a flight due to fuel and oil consumption.
The engine was first ground tested in mid-1991. [3] On August 21, 1992, the engine had its first test flight on a Cessna Citation VII testbed aircraft . [ 4 ] In 1995, Rolls-Royce bought Allison Engine Company and the engine had its first flight on the EMB-145.
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