水中交流电弧放电特性测试与仿真

为了探讨交流电弧放电在废水处理中的应用,将经典的Mayr和Cassie电弧微分方程模型以串联电阻的方式联合起来,并针对液态工质的特点引入了最小电导参数,建立了适合水中交流电弧的数学模型;采用Matlab/Simulink软件将电弧数学模型转换为电路模型,对放电伏安特性进行了仿真分析;改变数学模型中的最小电导,分析了其对仿真结果的影响。研究表明,水中交流电弧放电存在气液两相放电,水的气化程度越大放电波形畸变越大,稳定的电弧放电实质上发生在水蒸气中,实测与仿真的电弧放电波形基本一致。最小电导参数与废水的电导率密切相关,电导率越小,电弧重燃电压越大,稳定燃弧电压越小。

Characteristics Measurement and Simulation of AC Arc Discharge in Water

The application of AC arc discharge in waste water treatment was studied,and experiment system and its measurement circuit were designed.Discharge waveforms and the voltage-current characteristics were obtained from experiments.A mathematic model of AC arc in water was established.This model combined Cassie and Mayr arc differential equation models as two resistances in series.To meet the special needs of liquid work medium,a new model parameter of minimum electric conductance was introduced.Furthermore,the mathematic model was converted to a circuit model by the Matlab/Simulink software,and the arc's voltage-current characteristics were simulated by this conversion.The influence of minimum electric conductance was analyzed too.The results demonstrate that there exist gas-and liquid-phases discharge during arc generating process.The more water is vaporized,the more distortion discharge waveforms have.Regular arc discharge virtually occurred in vapor,and the simulated waveforms of arc discharge are accordant to the measurement waveforms to a large extent.The parameter of minimum electric conductance is nearly related to the conductance of waste water.When the conductance is reduced,the arc will have a higher reignite voltage and a lower steadily burning voltage.