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

这笔设备赠款将用于购买激光诊断成像系统，用于研究对更好地理解湍流燃烧和建立模型非常重要的研究。该系统在二维多路复用检测方案中使用增强的CCD摄像机和经像差校正的单色器来同时检测光谱和空间信息，通过能够在这种火焰中的多个位置同时采集光谱来极大地减少用于表征应变层流火焰的数据采集时间，消除了空间扫描的需要。该成像设备将在一项综合计划中发挥关键作用，该计划旨在构建和测试用于湍流燃烧建模和发动机模拟的应变层流火焰片的实验测量特性的“库”。目前正在使用非侵入式激光诊断技术收集此类数据，以测量受控良好的逆流预混扩散火焰中空间分辨的温度、速度和物质浓度分布；然而，目前的研究受制于每个“图书馆”所需的海量数据和获取这些数据所需的时间。(对于给定的燃料，需要测量大范围的应变率、压力、温度和当量比。)这一改进将使建立实验层流火焰库成为可能，以准确模拟尚未有动力学方案的真实燃料的湍流燃烧。

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.