采用一维自洽的等离子体流体模型数值研究了大气压同轴介质阻挡放电中电极曲率对放电非线性行为的影响.研究表明,在不同的电极曲率下放电可以呈现不同的非线性现象.传统的单倍周期放电只能在一定曲率范围内保持稳定,反之则经历倍周期分岔过程而转变为双倍周期放电,且转变时间与系统偏离分岔点的距离成反比.前次放电产生的空间电荷的记忆效应是造成该转变的主要原因.持续增大电极半径,放电首先经历一系列倍周期分岔进入混沌态,然后突变为对称性反向的单倍周期放电模式.
The effects of electrode curvature on nonlinear behaviors of coaxial dielectric barrier discharge at atmospheric pressure have been investigated numerically by using a self-consistent 1D fluid model. It is demonstrated that the discharge exhibits different nonlinear behaviors for different electrode curvature. A traditional single-period discharge keeps its stability in a narrow range of electrode curvature. On the contrary, it will transit into a double-period discharge through period-doubling bifurcation. Meanwhile, the transition time is inversely proportional to the deviation level from the bifurcation point. The memory effect of space charge created in the previous discharge is responsible for this transition. As the electrode radius increases, the discharge first transits into a chaotic state through a series of period-doubling bifurcations, and then into another single-period discharge mode with opposite symmetry.
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