Modeling of Interaction Between Weakly Ionized Near- Surface Plasmas and Gas Flow
Modeling of Interaction Between Weakly Ionized Near- Surface Plasmas and Gas Flow
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DOI：
10.2514/6.2006-1204
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
Alexander Likhanskii;M. Shneider;S. Macheret;R. Miles
中科院分区：
文献类型：
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作者：
Alexander Likhanskii;M. Shneider;S. Macheret;R. Miles
建立了空气中非对称介质阻挡放电的详细物理模型。建立了正弦电压下介质阻挡放电的数学模型。在阴极阶段的电子充电的电介质表面的主导作用被证明是至关重要的，作为一个鱼叉，拉动正离子前进，加速在阳极阶段的气体。正离子运动回到暴露的电极被示出是一个主要来源的低效率的正弦或近正弦电压的情况下。基于对DBD物理学的理解，提出了一种最佳电压波形，包括高重复率短（持续时间为几纳秒）负脉冲与施加到暴露电极的正直流偏置相结合。由此优化的DBD致动器产生的近表面气体射流的速度被示出为比具有类似参数的正弦信号大得多（潜在地-1-2个数量级）。
Detailed physical model for asymmetric dielectric barrier discharge (DBD) in air is developed. Modeling of DBD with applied sinusoidal voltage is carried out. The leading role of charging the dielectric surface by electrons in the cathode phase is shown to be critical, acting as a harpoon that pulls positive ions forward and accelerates the gas in the anode phase. The positive ion motion back towards the exposed electrode is shown to be a major source of inefficiency in the sinusoidal or near-sinusoidal voltage cases. Based on understanding of the DBD physics, an optimal voltage waveform is proposed, consisting in high repetition rate short (a few nanoseconds in duration) negative pulses combined with positive dc bias applied to the exposed electrode. The velocity of near-surface gas jet produced by the DBD actuator thus optimized is shown to be considerably (potentially – by 1-2 orders of magnitude) greater than that for a sinusoidal signal with similar parameters.