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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//F&II. &Ffilii,td, Wlii &Hl!o>t E-bcams B field V fore body jxB Flow inlet Cowl lip Figure 6. MHD Control of Scramjet Inlet Using E-Beam Ionization. The retarding ampere force restores the shock-on-lip condition at Mach numbers higher than the design value. THE AJAX CONCEPT: MHD BYPASS An MHD-assisted propulsion concept that has attracted perhaps the most attention over the last decade or two is known as the Ajax, or Ayaks. The concept, illustrated in Figure 7, originated in the 1980s at Leninetz Scientific & Production Enterprise (now Leninetz Holding Co.) in Leningrad, USSR (now St. Petersburg, Russia). A good overview of the concept and its present status and problems can be found in the recent article 23 included in the Special Section of the Journal of Propulsion and Power devoted to weakly ionized gases for propulsion enhancement, with one of the authors of this survey serving as special guest editor. UNCLASSIFIED/60A 0661611P1k W&li 8HLY 15
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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.