Effect of chemical reactions on electrohydrodynamic force generation process in dielectric barrier discharge
Effect of chemical reactions on electrohydrodynamic force generation process in dielectric barrier discharge
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介质阻挡放电中化学反应对电流体动力产生过程的影响
DOI：
10.1063/5.0006868
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发表时间：
2020-06
影响因子：
2.2
通讯作者：
K. Nakai;Atsushi Komuro;Hiroyuki Nishida
中科院分区：
文献类型：
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作者：
K. Nakai;Atsushi Komuro;Hiroyuki Nishida
介质阻挡放电（DBD）等离子体激励器的物理机制一般采用基于三流体模型的放电等离子体模拟。在这项研究中，化学反应的数值模型中考虑的模拟结果的影响进行了研究，从电流体动力学（EHD）力产生的DBD等离子体执行器的观点。正和负流光模拟利用三种类型的模型，考虑不同的反应和物种，调查分两步进行。在第一步中，其中的中和过程的影响进行了研究，与团簇离子（O4+）的电子复合起着重要的作用，它有助于减少种子电子生产和有效电离系数的正流光，并减少负离子生产的负流光，因此，传播长度和EHD力产生减少。在第二步中，其中的生产过程的影响进行了调查，逐步电离从亚稳态的影响很小，由于相当低的生产率。因此，数值模拟结果表明，数值模型需要考虑电子与O4+的复合才能准确预测流注的传播和EHD力的产生，而不需要考虑亚稳态分子。
A discharge plasma simulation based on a three-fluid model is generally utilized to understand the physical mechanism in a dielectric barrier discharge (DBD) plasma actuator. In this study, the influence of chemical reactions considered in a numerical model on the simulation results is investigated from the viewpoint of electrohydrodynamic (EHD) force generation in the DBD plasma actuator. Positive and negative streamers are simulated utilizing three types of models considering different reactions and species, and the investigation is conducted in two steps. In the first step, where the influence of the neutralization process is investigated, the electron recombination with a cluster ion (O4+) plays an important role; it contributes to the decrease in seed electron production and effective coefficient of ionization for the positive streamer, and the decrease in negative ion production for the negative streamer; as a result, the propagation length and EHD force generation decrease. In the second step, where the influence of the production process is investigated, the stepwise ionization from metastable states has little influence owing to quite low production rates. Therefore, the simulation results indicate that the numerical model needs to consider the electron recombination with O4+ to accurately predict the streamer propagation and EHD force generation, while it is unnecessary to take into account the metastable molecules.