Kinetics of Non-Equilibrium Fast Ionization Wave Plasmas in Gas Phase and Gas-Liquid Interface

气相及气液界面非平衡快电离波等离子体动力学

• 批准号: 1101994
• 负责人: Walter Lempert
• 金额: $ 27万
• 依托单位: Ohio State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1101994&HistoricalAwards=false
• 关键词: Kinetics; Non; Equilibrium; Fast; Ionization

Nonequilibrium plasma chemistry has been extensively studied recently due to its importance for a variety of engineering applications such as fuel reforming, hazardous emissions reduction,plasma assisted combustion, and plasma flow control. The use of nonequilibrium plasmas for these applications requires both understanding of fundamental kinetic processes involved, and the ability to generate, control, and characterize these plasmas at high pressures, high energy loadings, and in large volumes (over large surface areas). A promising method of generating large-volume, diffuse nonequilibrium plasmas in a wide range of pressures is what is known as the Fast Ionization Wave (FIW) discharge. In this approach, high peak voltage (approximately 10-100 kiloVolt),approximately 10-100 nanosecond duration voltage pulses are used to generate an ionization wave (wave speed of a few cm/nsec) propagating over large distances, up to several tens of centimeters. High electron energy achieved in the wave front dramatically accelerates key plasma processes such as molecular dissociation, thus generating reactive radical species. The project focuses on a comprehensive and fundamental experimental study of the physics and chemistry of FIW plasmas, featuring incorporation of a comprehensive suite of laser-baseed optical diagnostic techniques.In addition its technical goals, the program will also reflect many of the stated NSF criteria for broader impact. In particular, the program will advance "discovery and understanding" by i), direct involvement of graduate and undergraduate students, and ii), incorporation of the diagnostic methods, modeling tools, and principal findings into the undergraduate and graduate Mechanical Engineering curriculum at OSU. Every effort will also be made to broaden the participation in the research program of individuals from groups traditionally underrepresented in mechanical engineering and chemistry. The continued development FIW technology will also serve to enhance the high pressure plasma infrastructure of the U.S (and the world), potentially enabling a wide variety of applications such as: ignition and flame-holding in next generation high speed jet aircraft; high power gas dynamic lasers; and plasma aerodynamic flow control. The co-PIs are actively engaged in the transfer of plasma and advanced optical diagnostic technology as it is continually developed, to the government and industrial sectors through collaborations with the U.S Air Force, NASA, and a variety of small businesses. Finally, by maintaining an active web site, and by student and PI participation in national and international meetings, the principal findings will be rapidly disseminated to the scientific and educational communities at large.

非平衡等离子体化学由于其在诸如燃料重整、有害排放物减少、等离子体辅助燃烧和等离子体流动控制等各种工程应用中的重要性而近来被广泛研究。使用非平衡等离子体在这些应用中需要了解所涉及的基本动力学过程，以及在高压，高能量负载和大体积（大表面积）下产生，控制和表征这些等离子体的能力。快速电离波（FIW）放电是一种在宽气压范围内产生大体积扩散非平衡等离子体的有前途的方法。在该方法中，使用高峰电压（大约10-100千伏）、大约10-100纳秒持续时间的电压脉冲来产生在大距离上传播的电离波（几厘米/纳秒的波速），所述大距离高达几十厘米。在波阵面中获得的高电子能量大大加速了关键的等离子体过程，例如分子解离，从而产生反应性自由基物质。该项目的重点是对FIW等离子体的物理和化学进行全面的基础实验研究，包括一套全面的激光光学诊断技术。除了其技术目标外，该计划还将反映美国国家科学基金会的许多标准，以产生更广泛的影响。特别是，该计划将通过i），研究生和本科生的直接参与，以及ii），将诊断方法，建模工具和主要发现纳入俄勒冈州立大学的本科和研究生机械工程课程来推进“发现和理解”。还将尽一切努力扩大传统上在机械工程和化学中代表性不足的群体的个人参与研究计划。FIW技术的持续发展还将有助于增强美国（和世界）的高压等离子体基础设施，可能实现各种各样的应用，例如：下一代高速喷气式飞机的点火和火焰稳定;高功率气动激光器;等离子体气动流量控制。co-PI积极参与等离子体和先进光学诊断技术的转让，因为它是不断发展的，通过与美国空军，NASA和各种小企业的合作，政府和工业部门。最后，通过维持一个活跃的网站，并通过学生和PI参加国家和国际会议，主要研究结果将迅速传播给整个科学和教育界。