Abstract
DC arc thermal plasmas have the characteristics of high temperature, high enthalpy, and high chemical activity, and have been used in industry on a large scale, such as metallurgy, chemical industry, mechanical processing, material preparing, and so on. In the past few decades, numerous studies on the characteristics of thermal plasma jets have been carried out, in which turbulent thermal plasma jets account for a large proportion. However, the mechanism of the transition from laminar thermal plasma jets to turbulent thermal plasma jets is still unclear. The standard k-ε turbulence model has been used for most numerical studies on turbulent thermal plasma flow. But it is no longer valid in a region with a low Reynolds number.
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