Engineering Research Equipment Grant: Laser Diagnostics Imaging System for Turbulent Combustion Research

工程研究设备补助金：用于湍流燃烧研究的激光诊断成像系统

• 批准号: 9212518
• 负责人: Chung Law
• 金额: $ 5.99万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9212518&HistoricalAwards=false
• 关键词: Engineering; Research; Equipment; Grant; Laser

This equipment grant will be used for acquisition of a laser diagnostics imaging system for research important to development of better understanding and modeling of turbulent combustion. This system, which employs an intensified CCD camera and an aberration-corrected monochromator in a two- dimensional multiplexed detection scheme to simultaneously detect spectral and spatial information, greatly reduces data acquisition time for characterization of strained laminar flames by enabling the acquisition of simultaneous spectra at multiple locations in such flames, removing the need for spatial scanning. This imaging equipment will play a key role in a comprehensive program to construct and test "libraries" of experimentally measured properties of strained laminar flamelets for use in turbulent combustion modeling and engine simulations. Such data is currently being collected using non-intrusive laser diagnostics to measure spatially resolved temperature, velocity, and species concentration profiles in well- controlled counterflowing premixed diffusion flames; however, the current research is hampered by the massive amount of data required for each "library" and the time required to obtain it. (For a given fuel, measurements are required for a wide range of strain rates, pressures, temperatures, and equivalence ratios.) This improvement will make possible the construction of experimental laminar flamelet libraries for accurate modeling of turbulent combustion of realistic fuels for which kinetic schemes are not yet available.

这笔设备拨款将用于购买激光诊断成像系统，用于更好地理解和模拟湍流燃烧的重要研究。该系统采用加强型CCD相机和像差校正单色器，采用二维复用检测方案，同时检测光谱和空间信息。通过在此类火焰的多个位置同时获取光谱，从而消除了空间扫描的需要，大大减少了应变层流火焰表征的数据采集时间。该成像设备将在一个综合项目中发挥关键作用，该项目将构建和测试应变层流小片的实验测量特性“库”，用于湍流燃烧建模和发动机模拟。这些数据目前正在收集使用非侵入式激光诊断来测量空间分辨温度，速度和物质浓度分布在控制良好的逆流预混扩散火焰；然而，目前的研究受到每个“库”所需的大量数据和获取这些数据所需的时间的阻碍。（对于给定的燃料，需要测量大范围的应变率、压力、温度和等效比。）这一改进将使实验层流小火焰库的建立成为可能，以精确模拟尚未获得动力学方案的现实燃料的湍流燃烧。