EXTERNAL BURNING RAMJETS PRELIMINARY FEASIBILITY STUDY
JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
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Experiments and analyses have shown that burning beneath external surfaces of a supersonic vehicle can produce lift and reduce drag. Preliminary analyses of some two-dimensional external burning ramjet ERJ and external expansion ramjet EERJ models yield some encouraging results. The EERJ uses ducted subsonic combustion but all-external expansion, so that the two- dimensional or half-round nozzle obtains some heat relief by radiation and contributes to vehicle lift, increasing liftdrag ratio. Effects of vectoring the EERJ nozzle and advantages and disadvantages of substituting a simple ramp in place of the nonreflecting surface are explored briefly. Three possible paths for the design of hypersonic transport vehicles incorporating EERJs for cruise power and auxiliary lower speed engines are pictured and discussed in general terms.
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