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Image of a P&W duct burning engine, called a Variable Stream Control Engine (VSCE), from 1978. Seems to be the same concept as the JTF-17A. Essentially a form of 'straight-through' plenum chamber burning, with an ejector/reverser nozzle.


Source: Hines, Richard. Variable Stream Control Engine for Supersonic Propulsion. Orlando : American Institute of Aeronautics

and Astronautics, 1978, Vol. 15. AIAA 77-831.


An explanation of how it works:




Taken from a project for an SST at Virginia Tech, the 'Javelin': http://www.dept.aoe.vt.edu/~mason/Mason_f/VTJavelinSST.pdf


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