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Kamińska A.♦, Hoffman J., Vacher D.♦, Dudeck M.♦, Szymański Z., Electrical and plasma flow characteristics of a segmented plasmatron operating with mixture of gases,
PLASMA SOURCES SCIENCE AND TECHNOLOGY, ISSN: 0963-0252, DOI: 10.1088/0963-0252/24/5/055007, Vol.24, pp.055007-1-13, 2015Streszczenie: The electric characteristics of a segmented plasmatron and the results of optical emission spectroscopy of Ar-air, N2, and N2–CO2 are presented. The main working gas forming the plasma stream was fed near the cathode into the arc region and another additional gas was injected into the plasma stream beyond the arc. It is shown that the gas injected into the plasma stream is drawn to the arc area due to arc spot movement and cyclic arc shrinking and expanding due to the power supply pulsation. It was found that when the anode spot moves upstream, the additional gas is retracted into the arc region, changing the operating conditions of the plasmatron. The retraction mechanism depends on the gas type and is different in argon and molecular plasmas. The results of the plasma emission spectroscopy show differences in the electron excitation and rotational temperatures for the plasmas studied and are used to explain the mechanism of functioning of a segmented plasmatron. Słowa kluczowe: segmented plasmatron, electric properties, optical emission Afiliacje autorów:
Kamińska A. | - | inna afiliacja | Hoffman J. | - | IPPT PAN | Vacher D. | - | Université d’Auvergne (FR) | Dudeck M. | - | CNRS (FR) | Szymański Z. | - | IPPT PAN |
| | 45p. |
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Kamińska A.♦, Dudeck M.♦, Hoffman J., Szymański Z., Gouy P.A.♦, Vacher D.♦, A plasma jet produced in a segmented plasmatron: modelling and experiment,
PHYSICA SCRIPTA, ISSN: 0031-8949, DOI: 10.1088/0031-8949/2014/T161/014072, Vol.T161, pp.014072-1-4, 2014Streszczenie: Nitrogen and argon plasmas with a small admixture of air produced in a segmented plasmatron are studied both experimentally and theoretically. A two-temperature hydrodynamic model is used to simulate the plasma flow inside the plasmatron. The calculated plasma temperature and electron density are in reasonable agreement with the experimental values obtained from emission spectroscopy. The electron temperatures are several thousand kelvins higher than the atom temperatures, showing that the plasmas produced in the segmented plasmatron are in non-equilibrium. Słowa kluczowe: segmented plasmatron, plasma expansion, emission spectroscopy Afiliacje autorów:
Kamińska A. | - | inna afiliacja | Dudeck M. | - | CNRS (FR) | Hoffman J. | - | IPPT PAN | Szymański Z. | - | IPPT PAN | Gouy P.A. | - | Clermont Université (FR) | Vacher D. | - | Université d’Auvergne (FR) |
| | 25p. |
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Babou Y.♦, Lequang D.♦, Chazot O.♦, Surzhikov S.T.♦, Dikaljuk A.S.♦, Panarese A.♦, Cicala G.♦, Longo S.♦, Hoffman J., Szymański Z., Kamińska A.♦, Dudeck M.♦, Vacher D.♦, Thermodynamic Characterization of High-Speed and High-Enthalpy Plasma Flows,
The Open Plasma Physics Journal, ISSN: 1876-5343, DOI: 10.2174/1876534301407010155, Vol.7, pp.155-172, 2014Streszczenie: This contribution proposes a description of selected experimental activities conducted in aerospace sciences and dedicated to generate experimental data to assess atmospheric entry plasma models. In order to provide comprehensive set of experimental data, high enthalpy shock tube facilities have been developed to generate plasma representative of entry plasma for broad range of trajectory entry conditions. The shock-heated plasma is obtained through adiabatic compression and the resulting post-shock plasma flow exhibits thermodynamic state analogous to actual entry plasma. However, significant insight can be obtained through experiments conducted also with non-equilibrium plasma flows obtained with other methods. The typical methodologies adopted to provide experimental data of interest to enhance entry plasma modeling are sketched for four distinct non-equilibrium plasma kinds produced respectively by four specific ground facilities. The contribution firstly will consider experimental campaigns conducted with a high enthalpy shock tube in order to document in absolute radiance the radiative signature in the UV spectral range of an Earth entry plasma. Then, the investigations of the interaction between a shock wave and an electrical discharge will be described. These investigations were performed to identify the role of the internal degrees of freedom of molecular gases on the propagation of the shock. Also, the contribution covers investigations devoted to the thermodynamic state characterizations by means of spectroscopic diagnostics in the cases of the non-equilibrium plasmas flows generated by plasma wind tunnels. The examination of the Saha-Boltzmann equilibrium is proposed in the case of a subsonic plasma flow. And at last, the characterization methods of air supersonic plasma jet are presented and the 2D distributions of the subsequently measured plasma properties are documented for a straight comparisons with non-equilibrium plasma jet computations. Słowa kluczowe: Abel transform, multi-temperature model optical emission spectroscopy, non-equilibrium plasma, particle in cell - Monte Carlo computation, plasma wind tunnel, Saha balance, shock tube, supersonic plasma Afiliacje autorów:
Babou Y. | - | von Kármán Institute for Fluid Dynamics (BE) | Lequang D. | - | von Kármán Institute for Fluid Dynamics (BE) | Chazot O. | - | von Kármán Institute for Fluid Dynamics (BE) | Surzhikov S.T. | - | Institute for Problems in Mechanics, Russian Academy of Sciences (RU) | Dikaljuk A.S. | - | Institute for Problems in Mechanics, Russian Academy of Sciences (RU) | Panarese A. | - | University of Bari (IT) | Cicala G. | - | Institute of Inorganic Methodologies and Plasmas (IT) | Longo S. | - | University of Bari (IT) | Hoffman J. | - | IPPT PAN | Szymański Z. | - | IPPT PAN | Kamińska A. | - | inna afiliacja | Dudeck M. | - | CNRS (FR) | Vacher D. | - | Université d’Auvergne (FR) |
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Kamińska A.♦, Hoffman J., Szymański Z., Dudeck M.♦, Plasmatron for Simulation of Re-entry Conditions in a Planetary Atmosphere,
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION, ISSN: 1070-9878, DOI: 10.1109/TDEI.2013.6633690, Vol.20, No.5, pp.1607-1615, 2013Streszczenie: The characteristics of segmented plasmatron are presented. The arc is sustained in argon plasma and in plasma stream, argon, nitrogen and carbon-dioxide are introduced. The numerical simulation of argon electric arc and plasma stream is carried out and the temperatures and densities of electron and heavy particles are presented. Experimental and theoretical investigations determine and explain the influence of natural gas and flow rate injected into plasma stream on working plasmatron conditions. The anode voltage drop analysis shows that in plasmatron working at a current between 40 and 340 A, gas flow rate between 0.4 and 2 g/s and pressure from 5 to 100 kPa, this drop changes from negative to positive, influencing arc voltage value. The gas injection into plasma stream results in anode spot dynamic. Electric breakdowns accompanied by high voltage fluctuations are observed when argon or nitrogen is introduced while carbon dioxide eliminates this type of breakdown reducing the voltage fluctuations and ablation of electrodes. Słowa kluczowe: segmented plasmatron, re-entry in planetary atmosphere, plasma jet Afiliacje autorów:
Kamińska A. | - | inna afiliacja | Hoffman J. | - | IPPT PAN | Szymański Z. | - | IPPT PAN | Dudeck M. | - | CNRS (FR) |
| | 25p. |