Vortical mechanism for generation of astrophysical jets |
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| Authors: | M G Abrahamyan |
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| Institution: | (1) Erevan State University, Erevan, Armenia |
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| Abstract: | A vortical mechanism for generation of astrophysical jets is proposed based on exact solutions of the hydrodynamic equations
with a generalized Rankine vortex. It is shown that the development of a Rankine vortex in the polar layer of a rotating gravitating
body creates longitudinal fluxes of matter that converge toward the vortex trunk, providing an exponential growth in the angular
rotation velocity of the trunk and a pressure drop on its axis. The increased rotational velocity of the vortex trunk and
the on-axis pressure drop cease when the discontinuity in the azimuthal velocity at the surface of the trunk reaches the sound
speed. During this time, ever deeper layers of the gravitating body are brought into the vortical motion, while the longitudinal
velocity of the flow along the vortex trunk builds up, producing jet outflows of mass from its surface. The resulting vortices
are essentially dissipationless.
Dedicated to the 100-th birthday of Academician V. A. Ambartsumyan
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Translated from Astrofizika, Vol. 51, No. 2, pp. 201–218 (May 2008). |
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| Keywords: | hydrodynamics vortex jet eruption generation acceleration |
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