A. Vardelle, University of Limoges, Limoges, France; E. Moreau, C. Chazelas, G. Mariaux, Limoges University, Limoges, France
A key aspect of the operation of most of non-transferred DC plasma torches is the stochastic behavior of the arc inside the nozzle and more works are required to better understand the arc behavior and the way it depends on the operating conditions. This work deals with a 3-D time-dependent modeling of the arc and plasma generation in a conventional plasma spray torch operating under the so-called “restrike” mode. The latter that is characterized by large voltage fluctuations, corresponds to a large range of plasma conditions used for coating manufacturing. The mathematical model is based on the simultaneous solutions of the conservation equations of mass, momentum, energy, electric current and the electromagnetism equations. It makes it possible to predict the motion of the anode attachment root on the anode surface and, the time-evolution of arc voltage and gas fields in the nozzle
A key aspect of the operation of most of non-transferred DC plasma torches is the stochastic behavior of the arc inside the nozzle and more works are required to better understand the arc behavior and the way it depends on the operating conditions.
This work deals with a 3-D time-dependent modeling of the arc and plasma generation in a conventional plasma spray torch operating under the so-called “restrike” mode. The latter that is characterized by large voltage fluctuations, corresponds to a large range of plasma conditions used for coating manufacturing.
The mathematical model is based on the simultaneous solutions of the conservation equations of mass, momentum, energy, electric current and the electromagnetism equations. It makes it possible to predict the motion of the anode attachment root on the anode surface and, the time-evolution of arc voltage and gas fields in the nozzle
