| 2000 №12 (07) | 2000 №12 (09) |
The Paton Welding Journal, 2000, #12, 51-54 pages
Modelling of heating and movement of particles in arc plasma at supercritical pressure gradient
S.V. Petrov1, A.G. Saakov1, O.L. Kotlyarov2, V.P. Yatsenko2
1RPC «TOPAS», Kyiv, Ukraine2Institute for General Power Engineering, NASU, Kyiv, Ukraine
Abstract
Results of calculation of the electric arc burning under conditions of a supercritical pressure gradient in a blocked nozzle and with dispersed particles injected in it are given. It is shown that a plasmatron based on this principle is an efficient means for heating and acceleration of the spraying powder. Molten particles which are not subjected to splitting in flight leave the arc plasma in such a plasmatron at a velocity of about 1000 m/s, which provides a substantial improvement in properties of the sprayed coatings.
Keywords: mathematical model, plasmatron arc, plasma flow, spraying powder, particle size, supersonic velocity
References
1. Petrov, S.V., Karp, I.P. (1993) Air-gas plasma spraying. Kyiv: Naukova Dumka.2. Stornin, L.E., Shraiber, A.A. (1994) Multiphase flows of gas with particles. Moscow: Mashinostroyeniye.
3. Engelsht, V.S., Gurovich, V.Ts., Desyatkov, G.A. et al. (1990) Theory of the electric arc column. Novosibirsk: Nauka.
4. Lukianov, G.A. (1985) Supersonic plasma jets. Leningrad: Mashinostroyeniye.
5. Donskoj, A.V., Klubnikin, V.S. (1979) Electric plasma processes and units in machine building. Leningrad: M ashinostroyeniye.
6. Nigmatulin, R.I. (1978) Fundamentals of mechanics of heterogeneous media. Moscow: Nauka.
7. Zinoviev, V.E. (1989) Thermal-physical properties of metals at high temperatures. Handbook. Moscow: Metallurgia.