三维共面介质阻挡放电装置及放电特性研究

针对传统介质阻挡放电(DBD)和共面(CDBD)处理三维或不规则材料的不足,文中设计一种由小型微秒脉冲电源驱动的三维CDBD处理装置,在箱体内部由多个单面CDBD反应器组合形成空间环绕式等离子体。通过光学和电学诊断手段测量了装置的放电功率、发光图像以及发射光谱等,研究了电源工作参数对放电均匀性、产生活性粒子强度以及能量效率的影响。结果表明,随着电源电压的升高,放电区域变大,放电均匀性增强,当电压达到11kV时能够激励整个放电区域,形成较均匀的等离子体。相同电压下,活性粒子强度随频率升高而提高,在5kHz工作频率下产生的活性粒子强度最强,能量效率随工作频率升高有所下降,工作频率为1kHz时能量效率最高为40.1%。通过对木块进行表面亲水改性,来验证装置的三维材料处理效果。结果表明,处理后木块各个表面的亲水性均得到增强,处理1min后,达到稳态时的表面水接触角由30°下降至10°,并且由初始值下降至30°以下的液滴静置时间减少了70%以上。

Research on Three Dimensional Coplanar Dielectric Barrier Discharge Device and Its Discharge Characteristics

In order to compensate the deficiency of traditional dielectric barrier discharge(DBD)and coplanar dielectric barrier discharge(CDBD)on treating materials with three dimension or irregular shape,a three dimensional CDBD processing device driven by microsecond pulse power supply is designed.Spatially-surrounded plasma is generated by a plurality of single CDBD reactors inside the processing tank.The discharge power,luminescent image and emission spectrum are obtained by means of optical and electrical measurements.The influence of power supply parameters on discharge uniformity,the intensity of active particles and energy efficiency is investigated.The results show that the discharge area and uniformity are improved with the increasing of the supply power voltage.The whole surface discharge area is stimulated under the voltage of 11 kV,and uniform plasma is acquired.Under the same voltage,the intensity of active particles increases with the increase of frequency,and the intensity of active particles is the strongest at 5 kHz operating frequency.The energy efficiency decreases with the increase of working frequency.The highest energy efficiency is 40.1%at 1 kHz operating frequency.The wood blocks of Pinus Sylvestris are taken as the target to verify the function of the device for treating three dimensional materials.After treatment,the hydrophobicity of treated surfaces is synchronously improved.The water contact angle of steady status decreases from 30°to 10°after 1 min treatment,and the duration for the water contact angle of the wood block to fall from the initial value to less than 30°is reduced by more than 70%.