The General Electric YJ101 was an
afterburning
An afterburner (or reheat in British English) is an additional combustion component used on some jet engines, mostly those on military aircraft, military supersonic aircraft. Its purpose is to increase thrust, usually for supersonic flight, ta ...
turbojet
The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, and ...
engine, as signified by its "J" designation, in the 15,000
lbf
The pound of force or pound-force (symbol: lbf, sometimes lbf,) is a unit of force used in some systems of measurement, including English Engineering units and the foot–pound–second system.
Pound-force should not be confused with pound ...
class. It was designed for the Northrop P-530 Cobra but its initial application was the
Northrop YF-17
The Northrop YF-17 (nicknamed "Cobra") is a prototype lightweight fighter aircraft designed by Northrop aviation for the United States Air Force's Lightweight Fighter (LWF) technology evaluation program. The LWF was initiated because many in ...
entry in the
Lightweight Fighter (LWF) competition. It was subsequently developed into the widely used
General Electric
General Electric Company (GE) was an American Multinational corporation, multinational Conglomerate (company), conglomerate founded in 1892, incorporated in the New York (state), state of New York and headquartered in Boston.
Over the year ...
F404
The General Electric F404 and F412 are a family of afterburning turbofan engines in the class (static thrust). The series is produced by GE Aerospace. Partners include Volvo Aero, which builds the RM12 variant. The F404 was developed into the l ...
.
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
General Electric Company (GE) was an American Multinational corporation, multinational Conglomerate (company), conglomerate founded in 1892, incorporated in the New York (state), state of New York and headquartered in Boston.
Over the year ...
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".
[The Lightweight Fighter Program:A Successful Approach to Fighter Technology Transition, Aronstein and Piccirillo 1996, , p.42] This referred to using the compressor bypass air to cool the afterburner instead of using much hotter turbine exhaust gas.
Applications
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Northrop YF-17
The Northrop YF-17 (nicknamed "Cobra") is a prototype lightweight fighter aircraft designed by Northrop aviation for the United States Air Force's Lightweight Fighter (LWF) technology evaluation program. The LWF was initiated because many in ...
Specifications (YJ101)
See also
References
*
External links
F404 page on GlobalSecurity.org
{{USAF gas turbine engines
YJ101
1970s turbojet engines