J D Yan et al 1999 J. Phys. D: Appl. Phys. 32 1401 doi:10.1088/0022-3727/32/12/317
J D Yan, K I Nuttall and M T C Fang
Show affiliationsA comparative study of the two most popular turbulence models, the Prandtl mixing length model and the K-epsilon model, has been carried out for turbulent SF6 arcs burning in a supersonic nozzle under direct current conditions. The computed radial temperature profiles are compared with those measured previously by Leseberg and Pietsch at currents of 100 A, 600 A and 1800 A, respectively. It has been found that the turbulence parameters of the K-epsilon model are dependent upon the arcing current while those of the Prandtl mixing length model are applicable for all the currents investigated. For turbulent SF6 arcs in a supersonic nozzle, consideration of the range of applicability of the turbulence parameters and the cost of computation have made the Prandtl mixing length model preferable to the K-epsilon model.
47.40.Ki Supersonic and hypersonic flows
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
Issue 12 (21 June 1999)
Received 27 April 1988, in final form 23 February 1999
J D Yan et al 1999 J. Phys. D: Appl. Phys. 32 1401
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