A comprehensive numerical model for the electrohydrodynamic flow generated by gas discharges and its application to simulate, design and optimize practical devices and processes

气体放电产生的电流体动力流的综合数值模型及其在模拟、设计和优化实际装置和过程中的应用

• 批准号: RGPIN-2022-04480
• 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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=752012
• 关键词: comprehensive; numerical; model; electrohydrodynamic; flow

Many processes in industry, medicine and environmental protection involve electrical discharges in gases. Ions generated in these discharges collide with neutral molecules, which results in the electrohydrodynamic gas flow. Designing and optimizing practical devices based on this flow require a thorough understanding of the process and ability to predict its electrical, chemical, thermal and aerodynamic characteristics. The long-term objective of the proposed research program is to create a comprehensive numerical algorithm, which can be used to simulate electric discharges and electrohydrodynamic gas flow, assuming different parameters of the process. This algorithm will be developed in phases, gradually increasing the complexity of the physical model. As not all applications need the numerical models in the full complexity, in parallel with the model development, the intermediate models will be used for simulation and optimization of some practical devices. Different versions of the developed numerical algorithm will first be validated on some generic configurations. At the same time, the fundamental properties of different kinds of electric discharge under various ambient conditions will be studied. Many aspects of the process are still not well understood, for example the role of some species and reactions. The results of numerical simulation will be compared with experimental data. After the accuracy of the numerical algorithm has been confirmed, it will be used to investigate some important practical applications. The electrohydrodynamic control of the flow boundary layer can potentially revolutionize the aerospace industry providing the most flexible, reliable and inexpensive control of lift and drag forces, and other flow parameters. The numerical models used so far by aerospace engineers are based on extremely simplified approaches, which use inadequate physics and need a detailed calibration. On the other side, the full discharge models proposed by the plasma physicists are impractical because they require very long computing time and large computer memory. A novel approach based on a mean discharge model, developed as a part of the proposed research program, should be able to compromise both approaches: it will include correct physics, but at the same time it could be used to solve many practical problems in a reasonable timeframe. It is also expected that the developed numerical algorithms could be used for designing and optimizing novel configurations of electrostatic precipitators. While these devices are routinely used in environmental protection, new challenges arise from stricter air quality regulations. The main research activities in this area are focused on collection of submicron particles. One of the new designs is based on Dielectric Barrier Discharge, but so far there have been no serious attempts to numerically simulate the process. The proposed program will attempt to fill this gap.

工业，医学和环境保护的许多过程都涉及气体中的电气排放。这些放电中产生的离子与中性分子碰撞，从而导致电流动力学气流。基于此流量的设计和优化实用设备需要对过程和预测其电气，化学，热和空气动力学特征的能力进行透彻的了解。 拟议的研究计划的长期目标是创建一种全面的数值算法，该算法可用于模拟电气排放和电水动力气流，假设该过程的不同参数。该算法将分阶段开发，从而逐渐增加物理模型的复杂性。由于并非所有应用都需要与模型开发同行的数值模型，因此中间模型将用于仿真和优化某些实际设备。开发的数值算法的不同版本将首先在某些通用配置上进行验证。同时，将研究各种环境条件下不同类型的电气排放的基本特性。该过程的许多方面仍然不太了解，例如某些物种和反应的作用。数值模拟的结果将与实验数据进行比较。在确认了数值算法的准确性之后，它将用于研究一些重要的实际应用。流动边界层的电水动力控制可能会彻底改变航空航天工业，从而为升力和阻力力以及其他流动参数提供最灵活，最可靠和廉价的控制。航空工程师迄今为止使用的数值模型基于极为简化的方法，这些方法使用物理不足，需要详细的校准。另一方面，血浆物理学家提出的完整放电模型是不切实际的，因为它们需要很长的计算时间和大量的计算机记忆。作为拟议研究计划的一部分开发的基于平均排放模型的新方法应能够损害这两种方法：它将包括正确的物理学，但同时它可以在合理的时间范围内用于解决许多实际问题。还可以预期，已开发的数值算法可用于设计和优化静电降水器的新型配置。尽管这些设备通常用于环境保护，但新的挑战是由更严格的空气质量法规引起的。该领域的主要研究活动集中于亚微米颗粒的收集。新设计之一是基于介电屏障的放电，但到目前为止，还没有进行数字模拟该过程的认真尝试。拟议的计划将试图填补这一空白。