General Electric YJ101

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YJ101
GENERAL ELECTRIC GE YJ-101 FORWARD VABI TEST ENGINE - NARA - 17425488.jpg
YJ101
Type Turbojet
National origin United States
Manufacturer General Electric Aircraft Engines
Major applications Northrop YF-17
Developed into General Electric F404

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, [1] 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.

Contents

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 shut down during flight (in-flight shutdown rate), and handling. This means stall-free operation throughout the entire flight envelope, allowing the pilot to make unrestricted throttle movements anywhere between idle and maximum afterburner. [2]

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 [3] as the afterburner was a simple turbojet style with no requirement for intentional mixing of the bypass flow with the turbine exhaust. [4] However, mixing is an important requirement for turbofan engines.

General Electric chose to describe the engine differently depending on the circumstances. To emphasize simplicity, it was a "leaky turbojet". For advanced technology, it was "the world's first self-cooled turbojet". [5] This referred to using the compressor bypass air to cool the afterburner instead of using much hotter turbine exhaust gas.

Applications

Specifications (YJ101)

Data fromJane's All The World's Aircraft 1975-76 [6] , NASA Technical Report [7]

General characteristics

Components

Performance

See also

Related development

Related lists

References

  1. ↑ Jane's All The World's Aircraft 1975-76, ISBN   0 531 03250 7 p.747
  2. ↑ Flight International, 14 April 1984, F404: Fighter pilot's engine, p.1021
  3. ↑ Flight International, 21 August 1978, "F-18: US Navy Air Combat Fighter", p.262
  4. ↑ Patierno, J. (1974). "YF-17 design concepts". 6th Aircraft Design,Flight Test and Operations Meeting. American Institute of Aeronautics and Astronautics. doi:10.2514/6.1974-936.
  5. ↑ The Lightweight Fighter Program:A Successful Approach to Fighter Technology Transition, Aronstein and Piccirillo 1996, ISBN   1 56347 193 0, p.42
  6. ↑ Jane's All The World's Aircraft 1975-76, ISBN   0 531 03250 7 p.748
  7. ↑ "Design definition study of NASA/Navy lift/cruise fan V/STOL aircraft. Volume 1: Summary report of Navy multimission aircraft". NASA Technical Reports Server. p. 40.
  8. ↑ "Boron/aluminum fan blades for SCAR engines". NASA Technical Reports Server. p. 106.
  9. ↑ "YJ101-YF-17 Aircraft Prototype Development Summary". DTIC. p. 28.
  10. ↑ "Conceptual design studies of lift/cruise fans for military transports". NASA Technical Reports Server. p. 7.
  11. ↑ "YJ101-YF-17 Aircraft Prototype Development Summary". DTIC. p. 17.
  12. ↑ "YJ101-YF-17 Aircraft Prototype Development Summary". DTIC. p. 31.
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