Abstract This work investigates the gas heating process of a single microdischarge (MD) and the evolution of flow dynamics due to the induced pressure waves by using the transient 3D gas flow model of a single MD (GFM-MD) with the calculated heating sources validated. The heating sources of different heating mechanisms are calculated by the 1.5D plasma fluid model with the framework of air chemistry and provided as the source term of the energy equation solved in the steady-state 3D GFM-Reactor for obtaining the temperature distribution of the reactor to validate the overall heating source by comparing with experimental measurements. The validated heating sources in different temporal phases are provided as the volumetric heating sources in the sheath and bulk regions in the transient 3D GFM-MD to model the gas heating process and evolution of flow dynamics. The simulated power consumption of a single MD is around 0.068 W which is close to the average measured power consumption of a single MD as around 0.053 W. The average gas temperature in the central region of the reactive zone is around 440 K which agrees with the rotational temperature determined as 460 K. The maximum simulated surface temperature reaches 414 K which is in good agreement with that measured by the IR thermal imager as 435 K. The spatial average heating source increases dramatically to the level of 1011 W m−3 in a few ns during the breakdown (BD) phase from the low heating source of 107 W m−3 in the pre-BD. Detailed analysis shows that the kinetics and ionic Joule heating are dominant heating sources with comparable contributions. The heating source of the kinetics reaches the level of 1011 W m−3 across the gap with a moderate increase near the sheath region, while the heating source of the ionic Joule heating remains at a low level across the gap with a dramatic increase to the level of 1013 W m−3 in the sheath region in the BD phase, resulting in the rapid increase of gas temperature from 390 K to 550 K in the sheath region in a few ns. The dramatic increase of the ionic Joule heating in the sheath region in the BD phase results in the rapid increase of pressure to the level of around 1060 torr. An induced high-pressure wave is formed and moves from the sheath region to ambient air with the wave speed estimated as 410 m s−1 which is close to the speed of sound as observed experimentally. The high-pressure region results in a significant pressure gradient between the sheath region and ambient air in the gap, leading to an increase of the flow velocity. As air moves rapidly outward from the sheath region, the density in the sheath region decreases. The low-density zone in the sheath region results in the formation of a low-pressure wave after the induced high-pressure wave. The pressure waves move outward continuously, leading to the evolution of flow dynamics.

中文翻译：

---

大气压介质阻挡放电中单个微放电的气体加热效应和感应压力波研究

摘要 本工作通过使用单微放电 (GFM-MD) 的瞬态 3D 气流模型以及计算的热源验证，研究了单微放电 (MD) 的气体加热过程和由诱导压力波引起的流动动力学演变。 . 不同加热机制的热源通过1.5D等离子流体模型在空气化学的框架下计算，并作为稳态3D GFM-Reactor中求解的能量方程的源项，用于获得反应器的温度分布通过与实验测量值进行比较来验证整体热源。在瞬态 3D GFM-MD 中，不同时间阶段的经过验证的加热源作为鞘区和体区的体积加热源提供，以模拟气体加热过程和流动动力学的演变。单个MD的模拟功耗约为0.068 W，接近于单个MD的平均测量功耗约为0.053 W。反应区中心区域的平均气体温度约为440 K，与旋转温度确定为 460 K。最大模拟表面温度达到 414 K，与红外热像仪测得的 435 K 非常吻合。空间平均热源急剧增加到 1011 W m-3 的水平。在 BD 前的 107 W m-3 低热源的击穿 (BD) 阶段期间为几个 ns。详细分析表明，动力学和离子焦耳加热是具有可比贡献的主要加热源。动力学的热源跨越间隙达到 1011 W m-3 的水平，在鞘区附近适度增加，而离子焦耳加热的热源跨越间隙保持在低水平，急剧增加到BD 相鞘区的 1013 W m-3 水平，导致鞘区的气体温度在几纳秒内从 390 K 迅速增加到 550 K。BD 相中鞘区离子焦耳热的急剧增加导致压力迅速增加到 1060 托左右的水平。诱导高压波形成并从鞘区移动到环境空气，波速估计为 410 ms-1，接近实验观察到的声速。高压区导致护套区与间隙中的环境空气之间存在显着的压力梯度，导致流速增加。随着空气从鞘区快速向外移动，鞘区中的密度降低。鞘区的低密度区导致在感应高压波之后形成低压波。压力波不断向外移动，导致流动动力学的演变。导致流速增加。随着空气从鞘区快速向外移动，鞘区中的密度降低。鞘区的低密度区导致在感应高压波之后形成低压波。压力波不断向外移动，导致流动动力学的演变。导致流速增加。随着空气从鞘区快速向外移动，鞘区中的密度降低。鞘区的低密度区导致在感应高压波之后形成低压波。压力波不断向外移动，导致流动动力学的演变。