CO_(2)电弧等离子加热器电热特性研究

Study on electric and thermal characteristics of CO_(2)arc plasma heater

对管状阴极轴线式CO_(2)电弧等离子加热器的电热特性进行了实验研究,得到了电流、气体流量、励磁电流和前电极长径比对电弧加热器的伏安特性和热效率的影响规律。采用相似理论模型,对实验数据进行回归分析,得到了加热器伏安特性和热损失系数的近似表达式。研究结果发现,CO_(2)气体流量和电弧电流对加热器的伏安特性和热效率都具有显著的影响,前电极的长径比和励磁电流则只对热效率具有影响。电弧加热器伏安特性和热损失系数的回归公式计算值与实验数据一致性较好,伏安特性回归误差<10.0%,热损失系数回归误差<18.2%。

The electric and thermal characteristics of the axial CO_(2)arc plasma heater with tubular cathode are researched experimentally,and the effects of different parameters including the arc current,gas mass flow,excitation current and length-diameter ratio of the front electrode on volt-ampere characteristic and heat efficiency of the CO_(2)arc plasma heater are obtained.Based on the experimental data,the regression analysis is carried out with the similarity theory model and approximate expressions are attained.The results show that both the volt-ampere characteristic and heat efficiency of the arc plasma heater are obviously affected by the arc current and mass flow of CO_(2),while the length-diameter ratio of the front electrode and excitation current have only effects on the heat efficiency.Values calculated by the regression equation of volt-ampere characteristic and coefficient of heat losses are in good agreement with the experimental data,and regression errors of volt-ampere characteristic and coefficient of heat losses are less than10.0%and 18.2%respectively.