Dual-mode airbreathing propulsion system
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United States of America Patent
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Oct 26, 2004
Grant Date -
Feb 12, 2004
app pub date -
Feb 7, 2003
filing date -
Feb 8, 2002
priority date (Note) -
Expired
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Abstract
The present invention includes a method for a dual-mode propulsion system. During the first mode of operation, intake air is liquefied through a cooling heat exchanger and condenser using a combination of stored liquid hydrogen (LH.sub.2) and stored liquid nitrogen (LN.sub.2) as coolants. The liquefied air is then separated into separated liquid oxygen (.sup.S LO.sub.2) and separated liquid nitrogen (.sup.S LN.sub.2), which may contain molecules of each other or other elements commonly found in air. The stored liquid nitrogen is replaced with .sup.S LO.sub.2, while the .sup.S LN.sub.2 is pumped back through the system with the stored nitrogen in a regeneration process. The .sup.S LN.sub.2, LN.sub.2, and LH.sub.2 become gaseous as they pass through the condenser and heat exchanger and are burned in the dual mode rocket thrust chamber to produce thrust. In the second mode, the same thrust chamber is operated as a liquid hydrogen-oxygen rocket, where the liquid oxygen is the .sup.S LO.sub.2 collected during the first mode.
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