The dielectric barrier discharge (DBD) in air at atmospheric pressure is not suitable for industrial applications due to its randomly distributed discharge filaments. In this paper, the influence of the electric field distribution on the uniformity of DBD is theoretically analyzed and experimentally verified. It is found that a certain degree of uneven electric field distributions can control the development of electron avalanches and regulate their transition to streamers in the gap. The discharge phenomena and electrical characteristics prove that an enhanced Townsend discharge can be formed in atmospheric-pressure air with a curved-plate electrode. The spectral analysis further confirms that the gas temperature of the plasma produced by the curved-plate electrode is close to room temperature, which is beneficial for industrial applications. This paper presents the relationship between the electron avalanche transition and the formation of a uniform DBD, which can provide some references for the development and applications of the DBD in the future.

由于其随机分布的放电灯丝，在大气压力下的介质阻挡放电 (DBD) 不适用于工业应用。本文对电场分布对DBD均匀性的影响进行了理论分析和实验验证。发现一定程度的不均匀电场分布可以控制电子雪崩的发展并调节其向间隙中的流光过渡。放电现象和电气特性证明，弯曲板电极可以在大气压空气中形成增强的汤森放电。光谱分析进一步证实，弯曲板电极产生的等离子体气体温度接近室温，有利于工业应用。