Structure and dynamics of supersonic jets

Details Structure and dynamics of supersonic jets Structure and dynamics of supersonic jets

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113..285n&link_type=abstract

Astronomy and Astrophysics, vol. 113, no. 2, Sept. 1982, p. 285-302.

Astronomy and Astrophysics

Astrophysics

335

Gas Dynamics, Kelvin-Helmholtz Instability, Plasma Jets, Radio Galaxies, Supersonic Jet Flow, Beam Interactions, Galactic Structure, Internal Waves, Jet Boundaries, Numerical Flow Visualization, Oblique Shock Waves, Radio Emission, Taylor Instability, Vortex Sheets

Scientific paper

Assuming that radio jets contain thermal matter governing the structure and dynamics of the jet, numerical experiments are conducted which probe the structure and stability of the three basic jet components conceived by the Blandford and Rees (1974, 1978) (BR) beam model for extragalactic radio sources. Jets are established by continuously injecting a collimated supersonic beam of gas into, and in pressure equilibrium with, the ambient medium. It is found that such beams propagate efficiently at Mach numbers greater than about six, and that the beam is decelerated at the working surface by a Mach-disk shock front which is in general much stronger than the bow shock running ahead of the jet. Waves and instabilities on the jet boundary generally perturb the beam, which is itself stable, and it is noted that perturbations set up oblique internal shock waves in the beam with a regular spacing of 1-2 jet diameters, independent of beam Mach number.

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