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在大气压条件下产生出能量衰减慢且分布均匀、噪音小的氩和氮氩混合气的层流等离子体射流。与湍流等离子体射流相比 ,由于对周围冷气体卷吸减少 ,层流射流在喷射方向的长度可增长 6倍。试验表明 ,只有采用结构合理的等离子枪 ,综合调控供气和电参数条件 ,抑制气流的脉动和抖动 ,才能形成层流等离子体射流。结合数值计算对等离子体气流温度分布的定性分析 ,说明层流情况下射流径向能量分布集中 ,轴向温度变化平缓 ,有利于材料表面处理的温度、处理区域和应力状态的控制。
At atmospheric pressure, a laminar plasma jet of argon and nitrogen-argon mixed gas with slow, uniform energy distribution and low noise is generated. Compared to turbulent plasma jets, laminar jets can grow 6 times longer in the jet direction due to less entrainment of the surrounding cold gas. Experiments show that only using a reasonable structure of the plasma gun, a comprehensive control of gas supply and electrical parameters of the conditions to suppress the pulsation and jitter air flow in order to form a laminar plasma jet. The qualitative analysis of the temperature distribution of the plasma gas flow in combination with the numerical calculation shows that the jet radial energy distribution is concentrated and the axial temperature change is gentle under the laminar flow conditions, which is in favor of the material surface treatment temperature, treatment area and stress state control.