Author:
Wei Daniel Y.C.,Farouk Bakhtier,Apelian Diran
Abstract
ABSTRACTThe prediction of temperature and fluid flow associated with a d.c. plasma jet exiting from the nozzle has been an important issue for-some years. Modeling efforts have mainly relied on incompressible flow formulations and various turbulence models to predict the d.c. plasma at atmospheric conditions. The primary assumption of such models is that the plasma is in local thermodynamic equilibrium, steady state, and that no other species from the ambient are entrained. In the subsonic parabolic approach, the plasma is treated as a free jet with no downstream influence on the upstream calculations. The elliptic approach needs conditions to bespecified along all boundaries, and calculations are dependent on the extent of the solutiondomain and the exit boundary conditions.Very few attempts have been made to model plasma jets which are supersonic upon exiting the nozzle. The problem is important due to the advantages of low pressure plasma deposition but is complex and difficult to analyze. Specifically one has to acount for compressibility and viscous dissipation effects. Off-design operating conditions (over or underexpanded conditions) greatly influence and complicate the plasma temperature and velocity profiles.
Publisher
Springer Science and Business Media LLC
Reference19 articles.
1. 14. Pergament H.S. , Dash S.M. and Wilmoth R.C. , 1978, “Predictions of Nearfield Jet Entrainment by an Interactive Mixing/After Burning Model”, AIAA Paper 78–1189,
2. Temperature and velocity fields in a gas stream exiting a plasma torch. A mathematical model and its experimental verification
3. A patched solution of the transonic flowfield about an axisymmetric boattail
4. 5. Dash S.M. , Weilerstein G. , and Vaglio-Laurin R. , 1975, “Compressibility Effects in Free Turbulent Shear Flow”, AFOSR-SR-75–1435, (Available from DTIC as AD-A016–535).
5. Navier-Stokes Solutions for an Axisymmetric Nozzle
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