Numerical Simulation and Analysis on Jet Characteristics of Combined Plasma Arc
Jianbing Meng*, Xiaojuan Dong
Identifiers and Pagination:Year: 2011
First Page: 78
Last Page: 86
Publisher Id: TOMEJ-5-78
Article History:Received Date: 26/11/2010
Revision Received Date: 15/2/2011
Acceptance Date: 21/2/2011
Electronic publication date: 6/5/2011
Collection year: 2010
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
A three-dimensional axisymmetric mathematical model, including the influence of the swirl exiting in the plasma torch, was developed to describe the heat transfer and fluid flow within a combined plasma arc. In the model, a mapping method and a meshing method of variable step-size were adopted to mesh the calculation domain and to improve the results precision. To overcome a problem from a coexistence of non-transferred arc and transfer arc and a complicated interaction between electric, magnetic, heat flow and fluid flow phenomena in the combined plasma arc, a sequential coupling method and a physical environment approach were introduced into the finite element analysis on jet characteristics of the combined plasma arc. Furthermore, the jet characteristics of combined plasma arc such as temperature, velocity, current density and electromagnetic force were studied; the effects of working current, gas flow and the distance from the nozzle outlet to the anode on the distributions of temperature, velocity and current density were also revealed. Compared with the collection and diagnosis on the combined plasma arc by CCD, the results show that the simulated value appears to be in good agreement with measured value, and the temperature of combined plasma arc is much dependent on the working current, while is less sensitive to the argon flow rate and the distance from the nozzle outlet to the workpiece anode.