论文标题
一项关于单脉冲流媒体在空气中产生物种产生能源效率的计算研究
A computational study on the energy efficiency of species production by single-pulse streamers in air
论文作者
论文摘要
我们使用2D轴对称流体模型研究了通过在大气干空气中用单电压脉冲进行流式排放的物种产生的能源效率。通过改变电极长度，脉冲持续时间和施加的电压来模拟六十种不同的正流媒体。在这些情况下，流媒体半径和速度差异约为一个数量级，但是最大电场的变化明显较小，约为30％。我们发现，具有相对较高的激活能量的N（4S），O（3p），NO和N2O的G值差异约30％至55％。这种变化主要是由两个因素引起的：沉积在流媒体头部区域的能量比例的差异，以及流媒体头部最大电场的差异。考虑到这两个因素时，我们计算的G值与NAIDIS提出的分析估计值（2012等离子源科学。11042001）非常吻合。我们还模拟了负流媒体，并发现它们的N（4s），O（3p）的产生和无能源效率较低。结果表明，可以通过减少流媒体通道中的焦耳加热并增加流板头处的最大电场来提高能源效率，例如，使用具有高施加电压的短电压脉冲。
We study the energy efficiency of species production by streamer discharges with a single voltage pulse in atmospheric dry air, using a 2D axisymmetric fluid model. Sixty different positive streamers are simulated by varying the electrode length, the pulse duration and the applied voltage. Between these cases, the streamer radius and velocity vary by about an order of magnitude, but the variation in the maximal electric field is significantly smaller, about 30%. We find that G-values for the production of N(4S), O(3P), NO and N2O, which have relatively high activation energies, vary by about 30% to 55%. This variation is mainly caused by two factors: differences in the fraction of energy deposited in the streamer head region, and differences in the maximal electric field at the streamer head. When accounting for both factors, our computed G-values are in good agreement with an analytic estimate proposed by Naidis (2012 Plasma Sources Sci. Technol. 21 042001). We also simulate negative streamers and find that their production of N(4S), O(3P) and NO is less energy efficient. The results suggest that energy efficiency can be increased by reducing Joule heating in the streamer channel and by increasing the maximal electric field at the streamer head, for example by using short voltage pulses with a high applied voltage.
