正弦交流电压驱动低气压CO_(2)放电特性的对比:DBD结构与裸电极结构  

Comparative study on discharge characteristics of low pressure CO_(2) driven by sinusoidal AC voltage:DBD and bare electrode structure

作　　者：付强 王聪 王语菲 常正实 Fu Qiang;Wang Cong;Wang Yu-Fei;Chang Zheng-Shi(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Linyi Power Supply Company,State Grid Shandong Electric Power Company,Linyi 276000,China)

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]国网山东省电力公司临沂供电公司,临沂276000

出　　处：《物理学报》2022年第11期277-292,共16页Acta Physica Sinica

基　　金：中央高校基本科研业务费专项资金(批准号:xzy012021014);北京卫星环境工程研究所创新基金(批准号:CAST-BISEE2019-021);北京宇航系统工程研究所创新基金(批准号:CALTJS2017-0031)资助的课题.

摘　　要：火星大气富含CO_(2)(~95%),对其原位利用具有重要的科学和经济价值.高压放电转化CO_(2)具有绿色环保、可控程度高、使用寿命长等优势,在火星CO_(2)资源原位转化利用方面具有应用潜力.本文模拟火星低气压条件下CO_(2)氛围,针对kHz交流电压驱动两种典型电极结构(有/无阻挡介质)的放电特性开展对比实验研究,并辅以数值仿真分析两种电极结构下CO_(2)放电产物及其转化途径.结果表明,引入阻挡介质后,由于介质表面累积电荷和空间电荷畸变电场导致放电从半周期单次放电转变为多脉冲放电,不同放电脉冲对应的放电通道随机产生.主要放电产物中,CO依赖阴极位降区边界处电子与CO_(2)附着分解反应产生,O_(2)大部分产生于瞬时阳极表面或瞬时阳极侧介质表面电子与CO_(2)^(+)复合分解反应.进一步发现,介质引入不改变二者产生位置和主导反应路径,但会降低阴极位降区边界处电子密度和电子温度,使CO产量有所减少;并降低放电功率,使到达瞬时阳极表面和瞬时阳极侧介质表面的CO_(2)^(+)产额不足,生成O_(2)减少.The low-pressure atmosphere rich in CO_(2)(~95%)on Mars makes the in-situ resource utilization of Martian CO_(2) and the improvement of oxidation attract widespread attention.It contributes to constructing the Mars base which will support the deep space exploration.Conversion of CO_(2) based on high voltage discharge has the advantages of environmental friendliness,high efficiency and long service life.It has application potential in the in-situ conversion and utilization of Martian CO_(2) resources.We simulate the CO_(2) atmosphere of Mars where the pressure is fixed at 1 kPa and the temperature is maintained at room temperature.A comparative study is carried out on the discharge characteristics of two typical electrode structures(with/without barrier dielectric)driven by 20 kHz AC voltage.Combined with numerical simulations,the CO_(2) discharge characteristics,products and their conversion pathways are analyzed.The results show that the discharge mode changes from single discharge during each half cycle into multi discharge pulses after adding the barrier dielectric.Each discharge pulse of the multi pulses corresponds to a random discharge channel,which is induced by the distorted electric field of accumulated charge on the dielectric surface and the space charge.The accumulated charge on the dielectric surface promotes the primary discharge and inhibits the secondary discharge.Space charge will be conducive to the occurrence of secondary discharge.The main products in discharge process include CO_(2)^(+),CO,O_(2),C,and O.Among the products,CO is produced mainly by the attachment decomposition reaction between energetic electrons and CO_(2) at the boundary of cathode falling zone,and the contribution rate of the reaction can reach about 95%.The O_(2) is generated mainly by the compound decomposition reaction between electrons and CO_(2)^(+) near the instantaneous anode surface or instantaneous anode side dielectric surface,and the contribution rate of the reaction can reach about 98%.It is further found that th

关 键 词：低气压CO_(2) 放电特性 放电产物 反应路径 

分 类 号：O461[理学—电子物理学]