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Combustion initiation by electrical-discharge-induced plasma in lean and dilute methane-air mixture: experimental and modeling investigation.

机译：稀薄和稀薄的甲烷-空气混合物中由放电诱导的等离子体引发的燃烧：实验和模型研究。

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摘要

This dissertation represents experimental and numerical investigations of combustion initiation trigged by electrical-discharge-induced plasma within lean and dilute methane-air mixture. This research topic is of interest due to its potential to further promote the understanding and prediction of spark ignition quality in high efficiency gasoline engines, which operate with lean and dilute fuel-air mixture.;It is specified in this dissertation that the plasma to flame transition is the key process during the spark ignition event, yet it is also the most complicated and least understood procedure. Therefore the investigation is focused on the overlapped periods when plasma and flame both exists in the system.;Experimental study is divided into two parts. Experiments in Part I focuses on the flame kernel resulting from the electrical discharge. A number of external factors are found to affect the growth of the flame kernel, resulting in complex correlations between discharge and flame kernel. Heat loss from the flame kernel to code ambient is found to be a dominant factor that quenches the flame kernel. Another experimental focus is on the plasma channel. Electrical discharges into gases induce intense and highly transient plasma. Detailed observation of the size and contents of the discharge-induced plasma channel is performed.;Given the complex correlation and the multi-discipline physical/chemical processes involved in the plasma-flame transition, the modeling principle is taken to reproduce detailed transitions numerically with minimum analytical assumptions. Detailed measurement obtained from experimental work facilitates the more accurate description of initial reaction conditions. The novel and unique spark source considering both energy and species deposition is defined in a justified manner, which is the key feature of this Ignition by Plasma (IBP) model.;The results of numerical simulation are intuitive and the potential of numerical simulation to better resolve the complex spark ignition mechanism is presented. Meanwhile, imperfections of the IBP model and numerical simulation have been specified and will address future attentions.
机译：本论文代表了稀薄的甲烷-空气混合物中由放电诱导的等离子体触发的燃烧引发的实验和数值研究。由于它有可能进一步促进对稀薄和稀薄的燃油-空气混合物运行的高效汽油发动机的火花点火质量的理解和预测，因此受到了关注。过渡是火花点火过程中的关键过程，但它也是最复杂，了解最少的过程。因此，研究主要集中在等离子体和火焰同时存在于系统中的重叠时期。实验研究分为两个部分。第一部分的实验着重于放电产生的火焰核。发现许多外部因素会影响火焰核的生长，从而导致放电和火焰核之间的复杂关联。发现从火焰核到代码环境的热损失是淬灭火焰核的主要因素。另一个实验重点是等离子体通道。气体中的放电会引起强烈且高度瞬态的等离子体。对放电诱导的等离子体通道的大小和内容进行了详细的观察。鉴于等离子体火焰过渡过程涉及复杂的相关性和多学科的物理/化学过程，采用建模原理以数值方式再现了详细的过渡过程。最低分析假设。从实验工作中获得的详细测量值有助于更准确地描述初始反应条件。以合理的方式定义了兼顾能量和物质沉积的新颖独特的火花源，这是该等离子点火（IBP）模型的关键特征。数值模拟的结果直观易懂，数值模拟的潜力可能更好解决了复杂的火花点火机理。同时，IBP模型和数值模拟的缺陷已被指定，并将引起未来的关注。

著录项

  • 作者

    Zhang, Anqi.;

  • 作者单位

    Michigan Technological University.;

  • 授予单位 Michigan Technological University.;
  • 学科 Mechanical engineering.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 183 p.
  • 总页数 183
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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