Jets as Scramjets

Details Jets as Scramjets Jets as Scramjets

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6203w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #62.03; Bulletin of the American Astronomical Society, Vol. 39, p.848

Astronomy and Astrophysics

Astronomy

Scientific paper

Geometrically thin accretion disks are azimuthally supersonic, but vertically subsonic. Outflow in well-collimated jets is typically axially supersonic, but radially and azimuthally subsonic in the jet core. Particularly in a thick inner disk or flow, the transition from supersonic azimuthal motion to supersonic axial motion can be made in a flow in which the gas that is ejected is nowhere subsonic. Here, we investigate this possibility within protostellar jet systems. Such a scenario bears some semblance to scramjets, i.e. supersonic combustion ramjets, in which gas flow is nowhere subsonic. Of course, in the case of protostellar jets, the energy source is not combustion but release of gravitational potential energy from accreting gas and/or transfer of mechanical energy from a rotating central object. Nevertheless, there are some dynamical and thermodynamic similarities between scramjets and our protostellar jet outflow scenario, which we explore.

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