【摘要】 为研究亚微秒脉冲激励常压空气介质阻挡放电(DBD)时空演化规律,采用高速摄影相机(ICCD)在ns量级时间曝光范围内,分别在单次及连续放电(500Hz)情况下研究放电等离子体的发光性质及放电发展过程。结果表明:在亚微秒高压脉冲平行板结构放电条件下,起始阶段放电表现出不均匀性,随着电流增大发光增强并变得均匀,在回路电流最强位置时放电达到均匀状态,并且放电均匀性在回路电流下降阶段明显好于其上升沿阶段,放电发光强度与电流波形可以很好的吻合。在一定外界参数条件下,二次放电的存在受到电源重复频率、电压幅值等参数的影响。在单次放电条件下可以明显观测到二次放电的存在,相较于一次放电,二次放电更加均匀;连续状态放电模式下几乎观察不到二次放电。更多还原

【Abstract】 In order to study the spatio-temporal evolution of dielectric barrier discharge(DBD)excited by sub-microsecond pulse in atmospheric air,a high speed camera of intensified charge-coupled device(ICCD)which has a short exposure time of ns magnitude was used to photograph the process of the discharge,both the conditions of single and continuous(500Hz)discharges were carefully studied in this work.On the condition of parallel board discharge excited by sub-microsecond pulse,it was found that discharge was not uniform at the early stage of the discharge.The discharge reached a uniform state while the current reached the peak point.Discharge during the falling time of the discharge was more uniform than that during the rising time of the discharge,the intensity of the discharge emission light and the discharge current coincided with each other.The existence of second discharge depended on the applied parameters such as repetitive frequency and voltage amplitude.Second discharge of the DBD was observed obviously in the single discharge mode and it was more uniform than the first discharge,but in the continuous discharge mode,generally the second discharge was too weak to be measured.更多还原