Numerical Simulation and Diagnostic Analysis on DC Arc Plasma Torch
The internal physical process of direct current(DC)arc plasma torch is complex and very dynamic,and is difficult to be accurately described and studied in depth.Moreover,its working temperature is very high,which makes it difficult to measure the state parameters in a conventional way.In this paper,a numerical model of flow,heat transfer,and electromagnetic coupling is established for DC arc plasma torch,and the Fluent software is used to carry out three-dimensional(3D)numerical simulation and characteristic analyses on the DC arc plasma torch.A set of enthalpy probe experimental system is designed and constructed to measure and analyze the jet parameters of the DC arc plasma torch.The results show that the simulated results of the established numerical model are in good agreement with the experimental measured results,and the error is within 10％;the maximum values of the temperature and velocity in the torch are positively correlated with the flow rate of the working gas,which all appear near the cathode region and gradually decrease along the axis;the high temperature region in the plasma torch coincides with the high current density region.
direct current(DC)arc plasma torchenthalpy probemulti-physical field couplingnumerical simulationparametric diagnosis
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