Large eddy simulation on the flow characteristics of an argon thermal plasma jet

Xu ZHOU (周旭); Xianhui CHEN (陈仙辉); Taohong YE (叶桃红); Minming ZHU (朱旻明)

doi:10.1088/2058-6272/ac1f81

Plasma Science and Technology > 2021 > 23(12): 125405. > DOI: 10.1088/2058-6272/ac1f81

Xu ZHOU (周旭), Xianhui CHEN (陈仙辉), Taohong YE (叶桃红), Minming ZHU (朱旻明). Large eddy simulation on the flow characteristics of an argon thermal plasma jet[J]. Plasma Science and Technology, 2021, 23(12): 125405. DOI: 10.1088/2058-6272/ac1f81

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Large eddy simulation on the flow characteristics of an argon thermal plasma jet

School of Engineering Science, University of Science and Technology of China, Hefei 230022, People's Republic of China

Funds: This work is supported by National Natural Science Foundation of China (No. 12035015).

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Received Date: June 13, 2021
Revised Date: August 16, 2021
Accepted Date: August 18, 2021

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Abstract

Abstract

Large eddy simulations based on the CFD software OpenFOAM have been used to study the effect of Reynolds number and turbulence intensity on the flow and mixing characteristics of an argon thermal plasma jet. Detailed analysis was carried out with respect to four aspects: the average flow field, the instantaneous flow field, turbulence statistical characteristics and the self-similarity. It was shown that for the argon thermal plasma jet with low Reynolds number, increasing the turbulence intensity will increase the turbulent transport mechanism in the mixing layer rather than in the jet axis, leading to the faster development of turbulence. The effect of the turbulent transport mechanism increases with increasing Reynolds number. However, the characteristics of flow and mixing are not affected by turbulence intensity for high Reynolds number situations. It was also found that the mean axial velocity and mean temperature in the axis of the turbulent thermal plasma jet satisfy the self-similarity aspects downstream. In addition, decay constant K is 1.25, which is much smaller than that (5.7–6.1) of the turbulent cold gas jet and has nothing to do with the Reynolds number or turbulence intensity in the jet inlet.
- thermal plasma jet,
- mixing layer characteristics,
- Reynolds number,
- turbulenceintensity,
- large eddy simulation

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Large eddy simulation on the flow characteristics of an argon thermal plasma jet