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送交者: oldfarmer 2018月02月12日04:19:25 于 [世界军事论坛] 发送悄悄话
回  答: CFM International LEAP oldfarmer 于 2018-02-12 04:16:47

"While the LEAP is designed to operate at a higher pressure than the CFM56 (which is partly why it is more efficient), GE plans to set the operating pressure lower than the maximum in order to maximize the engine's service life and reliability. Currently proposed for the LEAP is a greater use of composite materials, a blisk fan in the compressor, a second-generation Twin Annular Pre-mixing Swirler (TAPS II) combustor, and a bypass ratio around 10-11:1. GE is using ceramic matrix composites (CMC) to build the turbine shrouds.[5]

These technological advances are projected to produce 16% lower fuel consumption.[6][7][8] Reliability is also supported by use of an eductor-based oil cooling system similar to that of the GEnx, featuring coolers mounted on the inner lining of the fan duct. According to Aviation Week's article, "The eductor device produces a venturi effect, which ensures a positive pressure to keep oil in the lower internal sump."[9] The engine has some of the first FAA-approved 3D-printed components."

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  There is a catch: - oldfarmer 02/12/18 (71)
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