Study On Energy Transition Efficiency And Electric Arc Characteristic Of Plasma Gun

Plasma gun has extensive application nowadays with their special properties of high energy current and high temperature. The meticulous research has been restrained with complicated internal structure and extreme working conditions. In this thesis, the key components of plasma gun, transfer and non-transfer plasma arc characteristic, plasma spraying particles are studied numerically and experimentally with plasma gun as the research subject. Some new results are presented.Temperature of the key components in the operation of plasma gun affects enormously the life of the plasma gun. In the paper, the key components of the plasma gun are analyzed in detail based on the establishment of physical and mathematical models. Computational results can make sure of the structure parameters and the cooling system parameters in the plasma gun.The heat transfer and fluid flow model of the plasma arc based on the commercial CFD code FLUENT is developed the computational program.The influence of the structure parameters on the compressed affect is studied in the two-dimensional transfer plasma arc model. The predicted results will provide the helpful basis to design the plasma gun. Models including the anode and considering the environment composition of air are studied in the two-dimensional non-transfer plasma arc, the former confirms the computational model in the next research, and the latter is used to measure.Asymmetry effects always exist in the three-dimensional non-transfer plasma arc. In the present thesis, reasonable physical models and mathematical models are proposed in order to calculate the combination of the diameter and the position of the anode spot in the plasma gun. Computational results are shown to be diameter and position in a particular power according to the principle of minimum entropy production.Power, gas flow rate of powder feed and runtime et al is received in the spraying simulation, which will provide a theory basis for spraying. The plasma gun is made by designing the structure parameters and cooling system parameters. Temperature of the key components of the plasma gun, temperature of outer fringe in non-transfer plasma arc and runtime of the spraying particles are measured, this validates the correctness of simulation model.