旋转滑动弧放电特性及放电状态定量评估教学实验设计

Design of teaching experiment on rotational sliding arc discharge characteristics and quantitative assessment of discharge states

等离子体旋转滑动弧电极可方便产生电弧旋转滑动工作模式,是一种高效分解碳氢化合物的方法,在能源转化和尾气处理应用场合具有很高的应用价值。该文设计了直通进气式等离子体旋转滑动弧装置,将电弧持续时间T_(Keep)、断弧时间T_(d)、电弧持续时间周期占比Duty和电弧旋转角度ω,作为滑动弧放电工作状态评估指标,定量评估了反应器装置在应用过程中的最优放电参数。基于对旋转滑动弧工作机理分析提出的简便定量分析方法,能够使学生更快地掌握旋转滑动弧放电应用分析方法,加深对放电实验课的理解,提高对实验现象和问题的分析能力。

Plasma rotating sliding arc electrodes can help realize an arc rotating sliding working mode,which is an efficient method for decomposing hydrocarbons.This approach possesses a huge potential for use in energy conversion and exhaust treatment scenarios.However,for students specializing in high voltage,conducting experiments on the basic discharge characteristics of high-voltage arc plasma is highly complex,especially after obtaining basic experimental data.The key to effectively conducting discharge experiments lies in the accurate analysis and evaluation of the results,which helps obtain optimized design parameters for discharge applications.This article addresses the issues in analyzing and processing arc discharge experimental data,and it proposes a new approach based on the through-flow type plasma rotating sliding arc device.Further,it introduces novel evaluation indicators such as arc duration time(T_(keep)),arc interruption time(T_(d)),duty cycle(Duty),and arc rotation angle(ω)as quantitative assessment parameters for the optimal design of arc discharge parameters in practical applications.As the rotating sliding arc is integrated into exhaust treatment,untreated exhaust flows through the plasma arc discharge region,requiring the maximum presence of arc in the entire exhaust emission pipeline,also referred to as the arc duration parameter Tkeep.Simultaneously,it is essential for the arc duration within a unit time and discharge cycle to acquire the maximum possible proportion of the total discharge cycle time to ensure effective exhaust treatment,as depicted in the Duty parameter proposed in this article.Lastly,as the sliding arc travels along the exhaust pipeline within the airflow,the larger the circular electrical angle formed by the arc in a unit time,the more effective the exhaust treatment,which is depicted in this article as the arc rotation angle parameterω.Under various experimental parameter conditions,this study establishes the relationships between input parameters and the four indicators based on data fitting,determines the optimal input parameters,and achieves the optimal operating conditions for the rotating sliding arc device.Finally,based on this evaluation method,with hydrocarbon(HC)levels in the exhaust in the range of 80-150 ppm,smaller CH_(4) proportions lead to better CH_(4) treatment effects,indicating that for diesel engine exhaust containing lower HC concentrations,this device can effectively remove HC.This confirms the validity of the evaluation method and assists students in obtaining correct experimental results through simple experimental analysis.This design is based on the quantitative evaluation of the rotating sliding arc discharge state and discharge teaching experiments,and it effectively determines the optimal quantitative values of electrical parameters and airflow parameters for the rotating sliding arc,elucidating the electrical characteristics mechanism of the arc discharge process.Based on this teaching experiment,students specializing in high-voltage discharges can learn to rapidly assess the discharge state of the sliding arc and obtain characteristic discharge parameters based on the electrical waveforms and discharge emissions images,gaining a deeper understanding of discharge mechanisms and data analysis.In terms of experimental design and hardware platform construction,students can learn how to design and build experimental platforms,determine testing goals,organize and analyze test data,deepen the understanding of discharge experiment courses,improve analytical skills for experimental phenomena and problems,and ignite interest and enthusiasm for learning and research,enhancing students'initiative and creativity in scientific research.This further provides crucial guidance for experimental teaching in high-voltage discharge specialties.