Abstract
Direct current (DC) arc plasma torches are widely used in various industrial applications. Studying processes in their anode area helps to extend their lifetime, and stabilize the plasma flow for plasma applications. This paper reports detailed observations of the fast movement (above 100 m/s) of the anode arc attachment in a hybrid water-argon DC arc plasma torch with an external anode. We measured a mean electrical conductivity of a plasma volume above the anode and found a relation between the attachment movement and the anode erosion. Further, we measured average attachment speed, the average period of the restrike process and the average distances travelled by the attachment under different experimental conditions such as different values of the arc electric current, argon flow rate and different anode configurations. For our measurements, we used a high-speed camera and a high-voltage probe. Our results are in agreement with a model of plasma generated by a hybrid plasma torch and with spectroscopy measurements. The results describe the movement of the anode arc attachment in detail and provide experimental data on average plasma electrical conductivity in hot anode areas. Both the measurements of the mean electrical conductivity and the procedure for quantitative comparisons of anode erosion can be used also in water plasma torches and theoretically also in gas plasma torches.
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References
Kavka T, Matejicek J, Ctibor P, Maslani A, Hrabovsky M (2011) Plasma spraying of copper by hybrid water-gas DC arc plasma torch. J Therm Spray Technol 20:760–774
Hlina M, Hrabovsky M, Kavka T, Konrad M (2014) Production of high quality syngas from argon/water plasma gasification of biomass and waste. Waste Manag 34:63–66
Hrabovsky M (2011) In: Shaukat SS (ed) Progress in biomass and bioenergy production. InTech, Rijeka
Kulacki Francis A (2017) Handbook of thermal science and engineering. Springer, Switzerland
Gao Y, An L, Sun C, Fu YQ (2005) Effect of anode arc root position on the behaviour of the DC non-transferred plasma jet at field free region. Plasma Chem Plasma Process 25:215–226
Paik S, Huang PC, Heberlein J, Pfender E (1993) Determination of the arc-root position in a DC plasma torch. Plasma Chem Plasma Process 13:379–397
Wang Ch, Zhang Z, Xia W, Cui H, Xia W (2017) Direct observation of anode arc root behaviours in a non-transferred arc plasma device with multiple cathodes. Plasma Chem Plasma Process 37:371–382
Wutzke SA, Pfender E, Eckert ERG (1968) Symptomatic behavior of an electric arc with a superimposed flow. AIAA J 6:1474–1482
Maecker H (1955) Plasmaströmungen in Lichtbögen infolge Eigenmagnetische Kompression. Zeitschrift für Physik 141:198–216
Wutzke SA, Pfender E, Eckert ERG (1967) Study of electric arc behaviour with superimposed flow. AIAA J 5:707–713
Duan Z, Heberlein J (2002) Arc instabilities in a plasma spray torch. J Thermal Spray Technol 11:44–51
Rat V, Mavier F, Coudert JF (2017) Electric arc fluctuations in DC plasma spray torch. Plasma Chem Plasma Process. https://doi.org/10.1007/s11090-017-9797-7
Wutzke SA (1967) Conditions governing the symptomatic behavior of an electric arc in superimposed flow field. Ph.D. thesis, University of Minnesota
Russ S, Pfender E, Heberlein J (1993) Anode arc attachment control using boundary layer bleed holes. In: Proceedings of the 1993 NTSC, Anaheim, CA, pp 7–11
Ondac P, Maslani A, Hrabovsky M (2016) Investigation of the arc-anode attachment area by utilizing a high-speed camera. Plasma Phys Technol 3:1–4
Trelles JP, Pfender E, Heberlein JVR (2007) Modelling of the arc reattachment process in plasma torches. J Phys D Appl Phys 40:5635
Iwata M, Shibuya M (1998) Effects of arc current and electrode size on electrode erosion in ac plasma torches. Electr Eng Jpn. 124:10–17
Szente RN, Munz RJ, Drouet MG (1992) Electrode erosion in plasma torches. Plasma Chem Plasma Process 12:327–343
Brezina V, Hrabovsky M, Konrad M, Kopecky V, Sember V (2001) New plasma spraying torch with combined gas-liquid stabilization of arc. In: Proceedings of the 15th international symposium on plasma chem, Orléans, France, vol 3, pp 1021–1026
Hrabovsky M, Kopecky V, Sember V, Kavka T, Chumak O, Konrad M (2006) Properties of hybrid water/gas DC Arc plasma torch. IEEE Trans Plasma Sci 34:1566–1575
Sember V, Maslani A (2009) A simple spectroscopic method for determining the temperature in H20-Ar thermal plasma jet. High Temp Mater Proc 13:217–228
Krenek P (2008) Thermophysical properties of H20-Ar plasmas at temperatures 400–50,000 K and pressure 0.1 MPa. Plasma Chem Plasma Process 28:107–122
Jenista J, Takana H, Nishiyama Bartlova M, Aubrecht V, Krenek P, Hrabovsky M, Kavka T, Sember V, Maslani A (2011) Integrated parametric study of a hybrid-stabilized argon–water arc under subsonic, transonic and supersonic plasma flow regimes. J Phys D Appl Phys 44:435204
Chumak O, Hrabovsky M, Kavka T et al (2006) Electric probe investigation of arc anode region in plasma torch. High Temp Mater Proc 10:515–524
Jenista J (2004) Numerical modeling of hybrid stabilized electric arc with uniform mixing of gases. IEEE Trans Plasma Sci 32:464–472
Kavka T, Kopecky V, Sember V, Maslani A (2006) Experimental investigation of development of fully turbulent plasma jet generated by hybrid gas-water torch. Czech J Phys 56:B821–B829
Kopecky V (2004) Dependence of frequency and phase velocity of plasma jet hydrodynamic instability on sound velocity. Czech J Phys 54:C1056–C1061
Szente RN (1987) Effect of the arc velocity on the cathode erosion rate in argon-nitrogen mixtures. J Phys D Appl Phys 20:754–756
Kavka T, Maslani A, Kopecky V, Sember V, Chumak O, Hrabovsky M (2008) Influence of plasma generation conditions in gas-water torch on spraying process. Thermal spray crossing borders: ITSC 2008. In: Proceedings of the international thermal spray conference and exposition. DVS Verlag, Duseldorf, pp 1457–1461
Kavka T, Maslani A, Chumak O, Hrabovsky M (2008): Character of plasma flow at the exit of DC arc gas-water torch. In: Proceedings of the 5th international conference on flow dynamics. Institute of Fluid Science Tohoku University, Sendai, pp 11–12
Jenista J, Kopecky V, Hrabovsky M (1999) Effect of vortex motion of stabilizing liquid wall on properties of arc in water plasma torch. In: Fauchais P et al (eds) Heat and mass transfer under plasma conditions—Annal of the New York Academy of Sciences vol 891, pp 64–71
Acknowledgments
The present work was supported by the Grant Agency of the Czech Republic under projects GA15-19444S and GC17-10246J. Access to the computing and storage facilities owned by parties and projects contributing to the National Grid Infrastructure MetaCentrum provided under the program “Projects of Large Research, Development, and Innovations Infrastructures” (CESNET LM2015042), is greatly appreciated.
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Ondac, P., Maslani, A., Hrabovsky, M. et al. Measurement of Anode Arc Attachment Movement in DC Arc Plasma Torch at Atmospheric Pressure. Plasma Chem Plasma Process 38, 637–654 (2018). https://doi.org/10.1007/s11090-018-9888-0
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DOI: https://doi.org/10.1007/s11090-018-9888-0