Experimental assessment of local thermodynamic equilibrium in VKI Plasmatron air plasma jet

• Autorzy: Lequang D. , Babou Y. , Andre P.
• Języki publikacji: EN

Abstrakty

EN

The thermodynamic state of subsonic air plasma jet, produced by VKI Plasmatron operating at 500 kW and 16 g.s-¹, in the pressure range 100-300 mbar, is investigated by means of optical emission spectroscopy diagnostics. The N and O atomic lines were recorded, in the visible spectral range at resolution of 0.066 nm, at 16 cm away from the outlet into the test chamber. The temperatures obtained assuming Local Thermodynamic Equilibrium (LTE) and only thermal equilibrium were found to agree quite well, indicating that the plasma is close to thermal equilibrium at temperature of about 10000 K. However electron densities, determined starting from Hβ line broadening measured on initial air mixture seeded with a small amount of water, were found to be about 10²¹ m-³, slightly lower than the densities calculated at LTE, similarly to plasma undergoing recombination.

Słowa kluczowe

EN

VKI Plasmatron; local thermodynamic equilibrium; optical emission spectroscopy

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Journal of Technical Physics
• Rocznik: 2009
• Tom: Vol. 50, no 3
• Strony: 151--162
• Opis fizyczny: Bibliogr. 13 poz., wykr.

Twórcy

autor

Lequang D.

autor

Babou Y.

autor

Andre P.

• Aeronautics and Aerospace Department von Karman Institute for Fluid Dynamics, Chaussee de Waterloo 72, 1640 Rhode-Saint-Genese, Belgium

Bibliografia

• 1. B. BOTTIN, Aerothermodynamic Model of an Inductively-Coupled Plasma Wind Tunnel, PhD Thesis, von Karman Institute for Fluid Dynamics; Aeronautics/Aerospace Department, 1999.
• 2. B. BOTTIN, O. CHAZOT, M. CARBONARO, V. VAN DER HAAGEN, and S. PARIS, Measurement Techniques for High Enthalpy and Plasma Flows, RTO-EN-8, AC/323(AVT)TP/23, 8, 2000.
• 3. V. VANDEN ABEELE, An efficient Computational Model for Inductively Coupled Air Plasma Flows under Thermal and Chemical Non-Equilibrium, PhD Thesis, von Karman Institute for Fluid Dynamics; Aeronautics/Aerospace Department, 2001.
• 4. J.-M. RAX, Physique des plasmas, Dunod, Paris 2007.
• 5. Y. BABOU, PH. RIVIERE, M-Y. PERRIN, A. SOUFIANI, Spectroscopic study of microwave plasmas of CO2 and CO2-N2 mixtures at atmospheric pressure, Plasma Sources Science and Technology, 17, 2008.
• 6. Y. BABOU, PH. RIVIERE, M-Y. PERRIN, A. SOUFIANI, High-Temperature and Nonequilibrium Partition Function and Thermodynamic Data of Diatomic Molecules, International Journal of Thermophysics, published 2009, DOI:10.1007/s10765-007-0288-6.
• 7. H.R. GRIEM, Plasma spectroscopy, McGraw-Hill, New York 1964.
• 8. M.A. GIGOSOS, V. CARDENOSO, New plasma diagnosis tables of hydrogen Stark broadening including ions dynamics, J. Phys. B:At. Mol. Opt. Phys., 29, 4795-4838, 1996.
• 9. C. STEHLE, R. HUTCHEON, Extensive tabulations of Stark broadened hydrogen line profiles, Astron. Astrophys. Suppl. Ser., 140, 93, 1999.
• 10. C.R. VIDAL, J. COOPER, E.W. SMITH, Hydrogen stark broadening tables, Astrophys. J. Suppl. Ser., 25, 37-136, 1973.
• 11. C.O. LAUX, T.G. SPENCE, C.H. KRUGER, R.N. ZARE, Optical diagnostics of atmospheric pressure air plasmas, Plasma Sources Sci. Technol., 12, 124-138, 2003.
• 12. Atomic spectra database accessible from http://physics.nist.gov/PhysRefData/ASD/index.html.
• 13. P.L. SMITH. C. HEISE, J.R. ESMOND, R.L. KURUCZ, University of Hannover, Spectroscopic database accessible from http://www.pmp.uni-hannover.de/cgi-bin/ssi/test/kurucz/sekur.html.