Artículos de revistas
Erosion Of A Copper Cathode In A Nonstationary Arc Spot. I. Experimental Investigation
Registro en:
Journal Of Engineering Physics And Thermophysics. , v. 77, n. 2, p. 377 - 383, 2004.
10620125
10.1023/B:JOEP.0000028518.06494.f4
2-s2.0-31144449960
Autor
Esipchuk A.M.
Marotta A.
Sharakhovskii L.I.
Institución
Resumen
A study has been made of the dependence of the erosion of a copper cathode of an electric-arc heater on the basic operating parameters: the arc current, the velocity of movement of an arc spot, and the temperature of the electrode surface. The experiments were conducted in a coaxial electric-arc heater with a magnetic movement of the arc in an air medium for an arc current of 95-480 A and a magnetic field of 0.005-0.417 T. The duration of the experiment, the axial velocity of a plasma-forming gas, and the flow rate of a cooling water were held constant. It has been shown that there are two different erosion regimes: the microerosion regime characterized by a weak dependence on the current and the macroerosion regime with a strong dependence on the current; the transition from one regime to the other is realized upon the attainment of the critical value of the current, dependent on the magnetic field and the thermal regime of the electrode. The existence of a velocity interval in which the specific erosion is minimum has been shown, which confirms the predictions of the earlier thermal model of erosion of cold electrodes. © 2004 Plenum Publishing Corporation. 77 2 377 383 Sharakhovskii, L.I., Marotta, A., Borisyuk, V.N., A theoretical and experimental investigation of copper electrode erosion in electric arc heaters. II: Experimental determination of arc spot parameters (1997) J. Phys. D: Appl. Phys., 30, pp. 2018-2025 Sharakhovskii, L.I., Marotta, A., Borisyuk, V.N., A theoretical and experimental investigation of copper electrode erosion in electric arc heaters. III: Experimental validation and prediction of erosion (1997) J. Phys. D: Appl. Phys., 30, pp. 2421-2430 Esipchuk, A.M., Marotta, A., Sharakhovskii, L.I., Magnetic-field effect on heat transfer within a cathode arc spot (2000) Inzh.-Fiz. Zh., 73 (6), pp. 1245-12554 Esipchuk, A.M., Marotta, A., Sharakhovskii, L.I., Experimental investigation of the current density and the heat-flux density in the cathode arc spot (2001) Inzh.-Fiz. Zh., 74 (3), pp. 198-206 Luikov, A.V., (1967) Heat-Conduction Theory [In Russian], , Vysshaya Shkola, Minsk Trofimov, E.P., Problem of a nonstationary temperature field of an unbounded hollow cylinder (1960) Inzh.-Fiz. Zh., 3 (10), pp. 47-53 Marotta, A., Sharakhovskii, L.I., Theoretical and experimental investigation of copper electrode erosion in electric arc heaters. I: The thermophysical model (1996) J. Phys. D: Appl. Phys., 29, pp. 2395-2403 Marotta, A., Sharakhovskii, L.I., Borisyuk, V.N., Heat transfer and plasmatron electrode erosion (1997) Inzh.-Fiz. Zh., 70 (4), pp. 551-559 Marotta, A., Sharakhovskii, L.I., Esipchuk, A.M., Step model of erosion of electrodes. I. Application to arc spots on the cathodes of electric-arc heaters (2003) Inzh.-Fiz. Zh., 76 (2), pp. 116-122 Zhukov, M., Zasypkin, I., Timoshevskii, A., Mikhailov, A., Desyatov, G., (1999) Low-Temperature Plasma: Electric-Arc Heaters [In Russian], 17. , Nauka, Novosibirsk Esipchuk, A.M., Sharakhovskii, L.I., Marotta, A., Velocity of electric-arc motion between coaxial electrodes in a magnetic field (2000) Inzh.-Fiz. Zh., 73 (6), pp. 1255-1260 Szente, R.N., Munz, R.J., Drouet, M.G., Effect of the arc velocity on the cathode erosion rate in argonnitrogen mixtures (1987) J. Phys. D: Appl. Phys., 20, pp. 754-756 Szente, R.N., Munz, R.J., Drouet, M.G., Arc velocity and cathode erosion rate in a magnetically driven arc burning in nitrogen (1988) J. Phys. D: Appl. Phys., 21, pp. 909-913 Harry, J.E., The measurement of the erosion rate at the electrodes of an arc rotated by a transverse magnetic field (1969) J. Appl. Phys., 40 (1), pp. 265-270 An'Shakov, A.S., Timoshevskii, A.N., Urbakh, E.K., Erosion of a copper cylindrical cathode in air (1988) Izv. Sib. Old. Akad. Nauk SSSR, Ser. Tekh. Nauk, 2 (7), pp. 65-68 Gao, Y., Munz, R.J., Tsantrizos, P.G., Characteristics and electrode erosion rates of a D.C. plasma torch operating with TiCl4 plasma gas (1994) Plasma Chem. Plasma Process., 14 (1), pp. 73-85 Shaboltas, A.S., Yas'Ko, O.I., Mechanism of heat transfer in the near-cathode region of a moving high-current electric arc (1971) Teplofiz. Vys. Temp., 9 (1), pp. 110-115