Electrical and Aerodynamic Effects of Corona and Dielectric Barrier Discharges; From Numerical Models to Optimization of Practical Devices

电晕和介质阻挡放电的电气和空气动力效应；

• 批准号: 105371-2012
• 负责人: Adamiak, Kazimierz
• 金额: $ 2.4万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=521910
• 关键词: Electrical; Aerodynamic; Effects; Corona; Dielectric

The project deals with fundamental investigation and numerical simulation of electric corona, dielectric barrier and sliding discharges. While the full mathematical model of both phenomena is rather complicated and practically impossible for numerical handling, a reasonable simplification needs to be created, which involves the most important reactions only. Numerical algorithm for simulating discharge problems involves two parts: calculation of electric field and transport of all ionic species. This is governed by hyperbolic equations, which cannot be solved using conventional techniques. It is planned that the Total Variation Diminishing schemes can be effective to predict spatial and temporal distributions of ionic species, but in the version which can work for unstructured triangular meshes. The developed algorithm will be first used to study the fundamental properties of corona discharge in oxygen under negative and positive polarities of corona electrode for the case including photoionization. Then, some other gases will be investigated, most importantly nitrogen, which is not an electronegative gas, but there is an experimental evidence that Trichel pulses can also exist in this gas. Due to widespread interest in application dielectric barrier discharge, a numerical algorithm for this phenomenon will be also developed. Two approaches will be attempted: a glow and a pulse models. First one is simplified as it is based on a single ionic species approach, which completely neglects the processes in the ionization layer. However, it should be fast for any electrode configurations. The pulse model will try to reproduce individual current pulses, which is much more accurate, but the algorithm must be optimized, so that the entire process can be simulated in a reasonable time. Working and validated numerical algorithms will be used for modeling and optimization of two practical devices: electrostatic precipitator for collecting submicrometer particles using dielectric barrier discharge and electrostatic actuator for controlling the aerodynamic boundary layer. Both topics are experimentally investigated by a few research teams, but there is an urgent need to create a numerical model, so that the research progress can be substantially accelerated.

该项目介绍了电动电晕，介电屏障和滑动的基本调查和数值模拟。尽管两种现象的完整数学模型对于数值处理都是相当复杂的，并且实际上是不可能的，但需要创建合理的简化，这仅涉及最重要的反应。用于模拟放电问题的数值算法涉及两个部分：电场的计算和所有离子物种的运输。这是由双曲线方程约束的，无法使用常规技术来解决。据计划，总变化减少方案可以有效预测离子物种的空间和时间分布，但在可以适用于非结构化三角形网格的版本中。开发的算法将首先用于研究Corona电极的负极和正极电极的氧气排放的基本特性，包括光电报。然后，将研究其他一些气体，最重要的是氮，这不是电源气体，但是有一个实验证据表明，这种气体中也可能存在毛状脉冲。由于对施用介电屏障排放的普遍兴趣，还将开发针对此现象的数值算法。将尝试两种方法：闪闪发光和脉冲模型。首先是基于单个离子物种方法的简化，该方法完全忽略了电离层中的过程。但是，对于任何电极配置，都应该很快。脉冲模型将尝试重现单个电流脉冲，这更准确，但是必须优化算法，以便可以在合理的时间内模拟整个过程。工作和经过验证的数值算法将用于建模和优化两个实际设备：使用介电屏障放电和静电执行器来控制空气动力学边界层，用于收集亚微米颗粒。这两个主题均经过一些研究团队的实验研究，但是迫切需要创建一个数值模型，以便可以实质上加速研究进度。