MRI: Development of a High Energy, High-Repetition-Rate Laser Diagnostic System for Time-Resolved Investigations of Turbulent Combustion Processes

MRI：开发高能量、高重复率激光诊断系统，用于湍流燃烧过程的时间分辨研究

• 批准号: 0923340
• 负责人: Jeffrey Sutton
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0923340&HistoricalAwards=false
• 关键词: MRI; Development; Energy; Repetition; Rate

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).0923340SuttonFunding is requested to develop a unique high-pulse-energy (~1 J/pulse) laser system that will enable quantitative ultra-high-frame-rate ( 20 kHz) Particle Imaging Velocimetry (PIV), Planar Laser-Induced Fluorescence (PLIF) and Rayleigh and Raman scattering diagnostics for temperature, velocity, and species concentration measurements in multiple dimensions over substantial temporal records (up to 1000 sequential images). The proposed laser system will be used to temporally- and spatially-resolve the governing physical and chemical processes occurring at the finest spatial and temporal scales in turbulent combustion environments. Combustion processes are inherently time-dependent and spatially-complex, thus a new era of high-speed imaging diagnostics are critical for resolving the fluctuating velocity and scalar quantities that ultimately control the flame stability, combustion efficiency, and chemical species (pollutant) production. The scarcity of experiments detailing the temporally-evolving nature of turbulent flames has been severely constrained by the lack of available laser technology. A successful instrumentation development program will result in a measurement capability that will facilitate a new fundamental understanding of chemically reacting flows that cannot be duplicated anywhere in the world. High-speed measurements of velocity, temperature, and species concentrations will yield new information on the time-dependent coupling between key chemical reactions and the highly intermittent turbulent flowfield that has not been explored in detail previously. As examples, the local fuel/air/product mixing and combustion stability will be examined in hierarchy of configurations ranging from laboratory-scale flames to high-pressure, multi-phase flow engine conditions. In addition, the proposed system will result in a new capability that encourages the collaboration between experimentalists and theoreticians by directly supporting the advancement of predictive, multi-scale, time-dependent combustion modeling.

该奖项根据 2009 年美国复苏和再投资法案（公法 111-5）提供资金。0923340Sutton 申请资金用于开发独特的高脉冲能量（~1 J/脉冲）激光系统，该系统将实现定量超高帧速率（20 kHz）粒子成像测速（PIV）、平面激光诱导荧光（PLIF）和 通过大量时间记录（最多 1000 个连续图像）对多个维度的温度、速度和物质浓度测量进行瑞利和拉曼散射诊断。所提出的激光系统将用于在时间和空间上解决在湍流燃烧环境中以最精细的空间和时间尺度发生的控制物理和化学过程。燃烧过程本质上是时间依赖性和空间复杂性的，因此高速成像诊断的新时代对于解决波动速度和标量至关重要，这些波动速度和标量最终控制火焰稳定性、燃烧效率和化学物质（污染物）的产生。由于缺乏可用的激光技术，详细描述湍流火焰随时间演变的性质的实验非常缺乏。成功的仪器开发计划将带来测量能力，从而促进对化学反应流的新的基本理解，这是在世界任何地方都无法复制的。速度、温度和物质浓度的高速测量将产生有关关键化学反应与高度间歇性湍流流场之间的时间依赖性耦合的新信息，而这些信息以前尚未详细探索过。例如，局部燃料/空气/产品混合和燃烧稳定性将在从实验室规模的火焰到高压、多相流发动机条件的配置层次中进行检查。此外，所提出的系统将带来一种新功能，通过直接支持预测性、多尺度、时间相关燃烧建模的进步，鼓励实验学家和理论家之间的合作。