直线等离子体装置中氩等离子体热负荷特性研究

Heat Flux Characteristics of Linear Argon Plasma

利用自建的单阴极直流弧光放电直线等离子体装置研究了氩等离子体的稳态热负荷特性,拟为研究等离子体性质、及其与壁材料相互作用提供一定的参考。研究表明,实验中产生的氩等离子体热负荷可达0.5 MW/m2,能持续稳定放电5h以上;氩等离子体热负荷与输入功率成正比,热效率随输入功率的增加而增大;等离子体热负荷强烈依赖于磁场和气体流量,磁场越强、流量越高热负荷越大;同时,增加气体流量或增强磁场,均可显著提高等离子体热效率。通过测量相同条件下距离阳极等离子体喷口215和430mm处的热负荷发现,两处热负荷相差2倍,表明在轴向上热负荷与距离成反比。

Here,we experimentally addressed the steady-state heat load of the argon plasma,generated in a lab-built,single cathode dc arc discharge linear plasma source,which is capable of discharging for over 5hand providing aplasma heat flux higher than 0.5 MW/m2,to understand the characteristics of the linear plasma and its reaction with the confining walls.The influence of the plasma generation conditions,including but not limited to the input-power,argon flow rate,magnetic field and pressure,on the Ar plasma heat flux and its thermal efficiency was investigated.The results show that the input power,Ar flow-rate and magnetic field all have a major impact on the heat flux and thermal efficiency.To be specific,at fixed Ar flow-rate and magnetic field strength,as the input power increases,both the heat flux and thermal efficiency increase;a higher flow rate and a stronger magnetic field result in higher heat flux and thermal efficiency.The axial heat flux decreases by 2times when moving from 215 to 430mm away from the anode nozzle.