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This Defense Intelligence Reference Document from the Defense Intelligence Agency, dated 21 November 2010, was produced in FY 2010 under the Advanced Aerospace Weapons System Applications (AAWSA) Program. It reviews propulsion concepts that use plasmas and magnetohydrodynamics. It finds the Ajax MHD energy bypass concept meaningless below Mach 12 but calls a reverse energy bypass with a Virtual Cowl potentially practical. It also predicts that electric propulsion will become standard for spacecraft.
UNCLASSIFIED/ ,'1"91'1 91"1"!!!11tt tl!!II!! 9HL"i' ---------->- ------> --- > - ------> - - - - - - - - ~1-- -- - A11 counte --:►---- -rf/m·: ' ''''''Ae1oc/y1Ji11n1c: /18:J/ ''' ' ' ❖ I Ch~mKJl H~J! R~g:m~1Jt10n 'iy,i~m I - -- Fuel I r C C C 0 " - C C O 0 '" E!ectnc energy Control sy of the aerod sterns ynamic stiescharacten -zzie: C C c_,--Ho-· C T~~H~-~~ -----.: cel~mtor rvlHD controlled ' inlet C:ombust1on cl1am ' -- ' -, Moct1fied Magneto-Plcisma-Chemical Ifuel I Engine !MPCE) Figure 7. Schematic of Ajax Hypersonic Vehicle Concept. The upper and lower pictures represent the same concept, but were published by the authors (A. Kuranov et al.) at different times. The key idea of the Ajax is that, with propulsion, aerodynamic, and heat protection system for hypersonic vehicles hitting their theoretical and practical limits, the only way beyond these limits is smart management of energy (i.e., taking energy from the surrounding flow and putting that energy where it is needed for propulsion benefits). The following three major concepts/systems are included in Ajax: 24 • Endothermic fuel conversion. A mixture of hydrocarbon fuel (similar to kerosene) and water initially stored on board is used to cool the external surfaces and engine walls, and the heat transferred to the mixture is used in 16 UNCLASSIFIED/60A 8FFIC!IIIIL tl9E OHLI
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 32 pages are in the text index: search them above, or from the library's search.