摘要
为了制备高能效、高活性且均匀稳定的大气压等离子体源,利用纳秒脉冲电源驱动氩气介质阻挡放电(dielectricbarrierdischarge,DBD),并添加H2O增强等离子体活性。通过电学及光学诊断方法,系统分析研究了H2O体积分数对放电特性的影响规律,并利用图像灰度标准差方法和等效电路模型方法,定量计算了放电均匀性和放电微观参量。结果表明,纳秒脉冲激励氩气DBD中H2O体积分数较低(0%~0.2%)时具有较好均匀性,当H2O体积分数升高后,其吸附电子引起空间电场畸变,产生明亮放电细丝导致放电均匀性降低,过量H2O添加会使放电熄灭;由于添加少量H2O可促进等离子体中电离过程,传输电荷、放电平均功率及能量效率随着H2O体积分数增加而增加,并在H2O体积分数为0.1%时达到极大值,之后随着H2O体积分数增加而减少。通过OH和Ar激发态粒子发射光谱强度表征等离子体活性,发现当H2O体积分数达到0.1%时,OH和Ar谱线强度达到最大,Ar激发态粒子发射光谱强度比值表明电子能量随着H2O体积分数增加而升高,在H2O体积分数为0.1%时达到最大值,之后降低。
To generate energy-efficient, reactive, homogeneous, and stable atmospheric pressure plasma sources, Ar dielectric barrier discharge(DBD) was excited by nanosecond pulsed power supply, and H2 O was added to enhance plasma reactivity. The discharge characteristics of the nanosecond pulsed Ar DBD with H2 O addition were investigated by electrical and optical diagnoses. The discharge uniformity was quantitatively calculated by the Gray Value Standard Deviation method, and the electrical parameters were studied by an equivalent electrical model. The results show that the ns-pulsed Ar DBD with 0%~0.2% H2 O content is in a uniform state. When the H2 O content is increased further, the added H2 O absorbs electrons and distorts the space electric field,resulting in bright filaments in space and the decrease of discharge uniformity. And the excessive H2 O will render the discharge to be extinguished. Since the addition of a small amount of H2 O can promote the Penning ionization process in the plasma, the transported charges, average discharge power and energy efficiency increase with the increase of H2 O content first, reach a maximum value at 0.1% H2 O content, and finally decrease with the increase of H2 O content. The plasma reactivity is characterized by the emission spectrum intensities of OH and Ar lines. It is found that, at 0.1% H2 O content, the intensities of OH and Ar lines reach the maximum values. The ratio of emission intensities of Ar lines indicates that the electron energy increases with the increase of H2 O content, reaches a maximum value at 0.1% H2 O content, and then drops.
作者
储海靖
刘峰
庄越
方志
CHU Haijing;LIU Feng;ZHUANG Yue;FANG Zhi(College of Electrical Engineering and Control Science,Nanjing Tech University,Nanjing 211816,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2021年第3期885-893,共9页
High Voltage Engineering
基金
国家自然科学基金(51777091)
江苏省研究生科研与实践创新计划(SJCX200345)
江苏省重点研发计划(产业前瞻与共性关键技术)(BE2017023)。
关键词
纳秒脉冲
介质阻挡放电
水蒸气
放电特性
均匀性
nanosecond pulse
dielectric barrier discharge
water vapor
discharge characteristics
uniformity
