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1 Journal of Technical Physics

1 2009

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

Lequang D., Babou Y., Andre P.

Journal of Technical Physics

2009

Vol. 50, no 3

151-162

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.