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The fan is housed in 134 in (340 cm) diameter case. [26] The GE9X has 16 blades, whereas the similarly sized GE90 has 22 and the smaller GEnx has 18. Having fewer fan blades reduces the engine weight, improves aerodynamic efficiency, and allows the low pressure (LP) fan and booster to spin faster to better match its speed with the LP turbine.
The communications include air traffic control clearances, pilot requests, and position reporting. FANS-1 is Boeing's solution and FANS-A is the Airbus solution. The main industry standards describing the operation of FANS-1/A products are ARINC 622 and EUROCAE ED-100/RTCA DO-258. Both the Airbus A380 and Boeing 787 have FANS-1/A capability.
In a geared turbofan, a planetary reduction gearbox between the fan and the LP shaft allows the latter to run at a higher rotational speed thus enabling fewer stages to be used in both the LP turbine and the LP compressor, increasing efficiency and reducing weight. However, some energy will be lost as heat in the gear mechanism and weight saved ...
The fan flow has lower exhaust velocity, giving much more thrust per unit energy (lower specific thrust). Both airstreams contribute to the gross thrust of the engine. The additional air for the bypass stream increases the ram drag in the air intake stream-tube, but there is still a significant increase in net thrust.
Mockup with compressor and turbine cutaway. After the budget of NASA on aeronautics research was severely cut at the start of 2006, Pratt & Whitney committed to spend $100 million a year on the geared turbofan (GTF) development for the next generation of single-aisle airliners, focused on the 25,000–35,000 lbf (110–160 kN) thrust range. [9]
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Make sure that the airplane is flying safely. And then, in the case of an engine fire, what you want to do is shut down the engine and secure the source of fuel to it.
There are two solutions to this problem: 1) Open up the cold nozzle area at low flight speeds, which moves the fan working line away from the surge. This has little effect on the position or slope of the surge line. OR 2) Make the effective surge line of the fan shallower by progressively reducing the pitch of the fan as the engine is throttled.
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