Effects of Nozzle Length and Process Parameters on Highly Constricted Oxygen Plasma Cutting Arc |
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| Authors: | Qianhong Zhou Hui Li Feng Liu Shaofeng Guo Wenkang Guo Ping Xu |
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| Institution: | (1) Plasma Laboratory, Institute of Modern Physics, Fudan University, Shanghai, 200433, China;(2) Department of Thermal Science & Energy Engineering, University of Science & Technology of China, Hefei, 230027, China |
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| Abstract: | The influence of nozzle length and two process parameters (arc current, mass flow rate) on the plasma cutting arc is investigated.
Modeling results show that nozzle length and these two process parameters have essential effects on plasma arc characteristics.
Long nozzle torch can provide high velocity plasma jet with high heat flux. Both arc voltage and chamber pressure increase
with the nozzle length. High arc current increases plasma velocity and temperature, enhances heat flux and augments chamber
pressure and thus, the shock wave. Strong mass flow has pinch effect on plasma arc inside the torch, enhances the arc voltage
and power, therefore increases plasma velocity, temperature and heat flux. |
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