AAWSAP DIRD, MHD Air Breathing Propulsion and Power for Aerospace Applications, November 2010

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UNCLASSIFIED/ /POR. OPPl@IAL ~91!!! OHL¥
E-beams
B field
forebody
vehicle
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 article23 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/FAA OFF1&1AI:: ~9E et•t I
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