Influence of the inlet gas velocity components on the survival of the vertex of gas in the plasma torch

M Gharaeinia,A H Sari,S Saviz

doi:10.1007/s40094-019-00357-1

M Gharaeinia, A H Sari + Show 1 more

Open Access

https://doi.org/10.1007/s40094-019-00357-1

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Abstract

The vortex gas injection into plasma torch is considered as a method for reducing electrodes erosion. In order to investigate the effects of vortex gas injection on plasma structure, as well as the effect of gas viscosity on the rate of rotation, a three-dimensional nonequilibrium and time-dependent non-transferred DC plasma torch model has been simulated. Viewing the general characteristics of the plasma shows that the model works well. The results have shown that if the components of the inlet gas velocity are not properly selected, it is possible that the rotary effects of the gas are greatly depleted even before the gas reaches the cathode tip and plasma formation. In this case, only the change in the axial component of the gas causes changes in the structure of the plasma. Vortex reduction is also observed during the movement of cold gases. It is observed that the change in viscosity of gas has significant effects on the rate of the vortex.

Highlights

Plasma torch is widely used in many applications such as plasma spraying, plasma cutting, plasma welding, and plasma waste disposal [1]
The rate of decrease of rotation inside the plasma torch is higher. Another goal of this paper is to study the effect of viscosity on the reduction of rotation in cold gases and to examine this dependence on the structure of the plasma torch
In order to investigate the effects of gas rotation on plasma structure, a three-dimensional, nonequilibrium, and timedependent plasma torch model is simulated

Summary

Introduction

Plasma torch is widely used in many applications such as plasma spraying, plasma cutting, plasma welding, and plasma waste disposal [1]. Another goal of this paper is to study the effect of viscosity on the reduction of rotation in cold gases and to examine this dependence on the structure of the plasma torch. In order to investigate the effects of gas rotation on plasma structure, a three-dimensional, nonequilibrium, and timedependent plasma torch model is simulated.

Results

Conclusion