• Source: General Electric YJ101

The General Electric YJ101 was an afterburning turbojet engine, as signified by its "J" designation, in the 15,000 lbf class. It was designed for the Northrop P-530 Cobra but its initial application was the Northrop YF-17 entry in the Lightweight Fighter (LWF) competition. It was subsequently developed into the widely used General Electric F404.




Design


Two essential requirements for the engine were reliability, which can be measured by the number of times a particular engine model has to be shutdown during flight (in-flight shut-down rate), and handling, which means stall-free operation throughout the flight envelope together with allowing the pilot to make unrestricted throttle movements anywhere between idle and maximum afterburner.
The engine used continuous bypass bleed from the compressor to cool the afterburner liner and nozzle. The bypass air was not mixed with hot air from the turbine as the afterburner was a simple turbojet style with no requirement for intentional mixing of the bypass flow with the turbine exhaust. However, mixing is an important requirement for turbofan engines.
General Electric chose to describe the engine differently depending on circumstance. To emphasize simplicity it was a "leaky turbojet". For advanced technology it was "the world's first self-cooled turbojet". This referred to using the compressor bypass air to cool the afterburner instead of using much hotter turbine exhaust gas.




Applications


Northrop YF-17




Specifications (YJ101)


Data from Jane's All The World's Aircraft 1975-76



General characteristics

Type: Two-shaft afterburning turbojet with continuous bypass bleed
Length: 145 inches (3,683 mm)
Diameter: 32.5 inches (826 mm)
Dry weight: 1,900 pounds (862 kg) (approx)



Components

Compressor: Three-stage axial LP, seven-stage axial HP
Combustors: Annular
Turbine: Single-stage LP, single-stage HP



Performance

Maximum thrust: 15,000 pounds (6,804 kg) class
Overall pressure ratio: In excess of 20:1
Bypass ratio: 0.25:1
Thrust-to-weight ratio: 7.9:1




See also



Related development

General Electric F404

Related lists

List of aircraft engines




References



Spick, Mike (2000). The Great Book of Modern Warplanes. Osceola, WI: MBI Publishing Company. ISBN 0-7603-0893-4.




External links



F404 page on GlobalSecurity.org

Kata Kunci Pencarian:

• General Electric F404
• YF-17 Cobra
• General Electric YJ101
• General Electric F404
• Northrop YF-17
• Volvo RM12
• Ed Woll