| 词条 | General Electric GE36 | ||||||||||||||
| 释义 |
The General Electric GE36 was an experimental aircraft engine, a hybrid between a turbofan and a turboprop, known as an unducted fan (UDF) or propfan. The GE36 was developed by General Electric Aircraft Engines,[2][3] with its CFM International partner Snecma taking a 35 percent share of development.[4] Design and developmentA General Electric F404 military turbofan was used as the basis for the GE36. The F404 mixed exhaust stream discharged through a turbine which drove two counter rotating stages of 10 and 8 fan blades each (originally 8 and 8).[5] The scimitar shape of the fan rotor blades can operate at speeds up to Mach .75, about 575 mph at sea level. The power turbine was a seven-stage (initially 6-stage[6]) turbine plus inlet and outlet guide vanes. The fourteen turbine blade rows rotated alternate rows in opposite directions. Each stage was a pair of rotors (there were no stators). The counter-rotating turbine ran at half the rpm of a conventional turbine,[6] so did not require a reduction gearbox to drive the fan.[7] Although the engine demonstrated an extremely low specific fuel consumption, cabin noise levels were a problem, even though the engines were mounted at the rear of the test aircraft. However, the noise was not considered an insurmountable problem. The downfall of this engine at the time was economic conditions (mostly a major drop in oil prices) post OPEC oil embargo.{{cn|date=March 2019}} Even though these engines never made it past development and prototype testing, the carbon composite fan blade technology lives on and is currently being used in engines (General Electric GE90 and General Electric GEnx) that power the Boeing 747, Boeing 777, and Boeing 787 Dreamliner.[3][8] Applications
See also{{Aircontent|related= |similar engines=
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|see also= }} References1. ^{{cite magazine |title=Manufacturers positioning for coming competitive battles |work=Air Transport World |publication-date=September 1986 |issn=0002-2543 |volume=23 |pages=20+ |quote=One of Boeing's claims for the 7J7 has been that its price will be comparable to today's transports on a per seat basis, or about the same as a 737-400 for which Piedmont, the launching customer, is paying $28 million. Harrington estimated that production GE36 UDFs will cost $5 million each. CFM56s cost about $3.2 million today. From this, according to Harrington's estimates, Boeing will need to do the 7J7 airframe for about $18 million each, a formidable challenge.}} 2. ^{{cite web|title=Ultra High Bypass Jet Engine Green Technology Airline Flight Test|url=https://www.youtube.com/watch?v=zxVAaIsfPIY}} 3. ^1 {{cite web|title=GE Reports – Honey I shrunk the World: How Materials Scientists Made the Globe Smaller|url=http://www.gereports.com/post/97574160730/honey-i-shrunk-the-world-how-materials}} 4. ^{{cite news |publication-date=June 8, 1985 |department=Paris Report |work=Flight International |title=Propfans ready by 1990 |url=https://www.flightglobal.com/pdfarchive/view/1985/1985%20-%201849.html |page=5}} 5. ^http://www.flightglobal.com/pdfarchive/view/1987/1987%20-%201622.html 6. ^1 https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900000732.pdf 7. ^{{cite web|title=Air & Space Magazine – The Short Happy Life of the Prop Fan|url=http://www.airspacemag.com/history-of-flight/the-short-happy-life-of-the-prop-fan-7856180/?no-ist}} 8. ^{{cite web|title=GE Aviation - Aircraft Engine History and Technology|url=https://www.youtube.com/watch?v=4lip8lPWFLo}}
External links{{Commons category}}
2 : Propfan engines|General Electric aircraft engines |
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