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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Печать: 1093-3611
ISSN Онлайн: 1940-4360

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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v13.i2.40
pages 155-164

THE CHARACTER OF FLOW IN THE FREE JET CLOSE TO AN ARC HEATER OUTPUT

J. Gregor
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic
I. Jakubova
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic
T. Mendl
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic
J. Senk
Faculty of Electrical Engineering and Communication, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic
T. Kavka
Thermal Plasma Department, Institute of Plasma Physics AS CR, Za Slovankou 3, 18200, Praha 8, Czech Republic

Краткое описание

The free jet of hot gas flowing out the output orifice of a hybrid water-argon arc heater is studied with emphasis on its interaction with the surrounding environment. The problem has been partly dealt with in the previous papers [1,2] for the region rather far from the output (nearly 40 cm from the output). In the present paper, attention is concentrated on the region close to the output of the arc heater where both the measuring method and equipment, and the computation process must be different, especially with respect to much higher temperatures and velocities. This article aims to deriving the method enabling to describe the interaction of free jet of the mixture of argon and water vapours with air of atmospheric pressure.
The designed mathematical model is based on the continuity and momentum equations determining the velocity field and is completed with the continuity equations for individual original components of plasma jet (argon, water vapour) including diffusion. The input experimental data of the model are temperature distribution measured by spectroscopy and axial velocity as described in [3,4]. The composition of the plasma jet at the arc heater's output has been calculated using emission coefficients of ArI (696.54 nm) and OI (715.67 nm) spectral lines [3]. Necessary data on thermodynamic and transport properties of individual species of the gas mixture have been taken from [5]. The designed model enables to compute the velocity field and to determine the influence of the coefficients characterizing laminar and turbulent part of viscosity and diffusion on the distribution of original components across the jet. Finally, the data on the diffusion of components computed by the designed method are compared with the data obtained from spectroscopic measurement.

ЛИТЕРАТУРА

  1. Gregor J., Jakubova I., and Senk J., Theoretical analysis of the influence of diffusion in free jet of hot gas mixture.

  2. Gregor J, Jakubova I, Mendl T, Senk J, and Konrad M, Interaction of hot gas mixture free jet with surrounding air.

  3. Sember V., Spectroscopic measurement of temperature and composition of plasma jet generated by a hybrid water argon torch.

  4. Sember V, Kavka T, Kopecky V, and Hrabovsky M., Comparison of spectroscopic and enthalpy probe measurements in H2O-Ar plasma jet.

  5. Pateyron B. and Delluc G., Computer Code T&T Winner.

  6. Gregor J, Jakubova I, Mendl T, Senk J, and Sember V., Determination of Basic Patrameters of Hot Gas Mixture Free Jet.

  7. Schlichting H., Theory of Boundary Layer.

  8. Launder B.E. and Spalding D.B., Mathematical Models of Turbulence.

  9. Boulos M.I., P. Fauchais , and Pfender M., Thermal Plasmas.


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