摘要
为实现较大间隙下的大气压空气介质阻挡均匀放电,通过ICCD高速相机研究了大气压空气均匀放电随时间的演化过程,并利用光学方法测量了大气压空气的电子碰撞电离系数（α系数）。ICCD高速时间分辨图像表明,大气压空气中的均匀放电是由汤森放电起始,随着放电的发展逐渐增强,当电流达到峰值时刻,放电也最强,但仍然为汤森放电。利用汤森放电阶段拍摄的纳秒级曝光时间的序列发光图像,对α系数进行了测量,测量了E/p0为29~32 V/（m·Pa）范围的大气压空气中的α系数。测量结果表明,α/p0与E/p0在一定范围内有函数关系,不同研究者在相同约化电场下测量得到的α/p0数值是接近的,至于细微的差别,一是来源于各自测量方法的不同,二是由于空气的附着系数在低E/p0值下十分分散,这也导致α系数的有效值也比较分散。该结果补充了低E/p0下α系数实验数据的空白。
In order to achieve uniform dielectric barrier discharge at atmospheric pressure under large air gap, the evolution of air uniform discharge at atmospheric pressure was studied by means of ICCD high speed camera. The α coefficient of atmospheric air was measured by optical method. It is shown that the uniform discharge in atmospheric air is Townsend discharge throughout the discharge process. The discharge increases with the development of the applied voltage. The discharge intensity reaches the strongest when the current reaches the peak time.Moreover, the distribution of the light intensity in the discharge gap was recorded by taking side-view photograph using an ICCD camera with an extremely short exposure time and compared with the theoretical distributions with different presumed α. The value of α was determined by the best fitting of the theoretical distribution to the experimental one, and was measured in atmospheric pressure air in the range of 29~32 V/（m·Pa） by using the light emission images. The results show that α/p0 and E/p0 in a certain range has a function relationship. The results of different studies in the same reduced field E/p0 are similar.The subtle differences come from two aspects：（1） their methods of measurement are different,（2）the air electronic attachment coefficient at low E/p0 value is very dispersed, thus the alpha coefficients of valid values are more scattered.
作者
冉俊霞
马东
罗海云
王新新
RAN Junxia1,2, MA Dong3, LUO Haiyun4, WANG Xinxin4(1. College of Physics Science and Technology, Hebei University, Baoding 071002, China; 2. Hebei Key Laboratory of Optic-electronic Information and Materials, Baoding 071002, China; 3. College of Electronic Information Engineering, Hebei University, Baoding 071002, China; 4. State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, Chin)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第3期876-880,共5页
High Voltage Engineering
基金
河北省自然科学基金(A2015201199)~~
关键词
介质阻挡放电
电子碰撞电离系数
汤森放电
空气
放电模式
dielectric barrier discharge
electron collision ionization coefficients
Townsend discharge
air
dischargemode
