Investigation of Nitric Oxide Kinetics in Diffusion Flames with Laser-Induced Fluorescence Spectroscopy and Detailed Modeling

利用激光诱导荧光光谱和详细建模研究扩散火焰中的一氧化氮动力学

• 批准号: 0087337
• 负责人: Volker Sick
• 金额: $ 30.85万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0087337&HistoricalAwards=false
• 关键词: Investigation; Nitric; Oxide; Kinetics; Diffusion

The objective of this joint project involving the University of Michigan, Imperial College (London), and Sandia National Laboratory (Livermore) is to improve understanding and predictive capability of nitric oxide (NO) formation from the prompt (Fenimore) pathway favored in diffusion and fuel-rich flames. Chemical species critical to the prompt mechanism are measured and compared to the results from detailed kinetic models. Temperature and concentrations of NO, CH radical, and oxygen atoms are measured in a stable diffusion flame using nonintrusive laser-based diagnostics. The flame studied is a methane/air diffusion flame stabilized on a Tsuji-type counterflow burner. Species measurements are made with nanosecond and picosecond laser-induced fluorescence (LIF). Temperatures are measured with coherent anti-Stokes Raman spectroscopy (CARS) and quenching is measured directly by resolving the temporal decay of the picosecond LIF signal. Calibration is performed using Rayleigh scattering (CH, O-atom) or by measuring known amounts of dopant (NO). Flame strain rates (air and fuel flows) are adjusted to provide various reaction conditions, and nitric oxide is added to the fuel to measure destruction of NO by reaction with hydrocarbons (reburn).Reduction of pollutant emissions, especially nitrogen oxides, is a key issue in the design of energy conversion devices including automobile engines, gas turbines, and home heating furnaces. Depending on flame conditions, formation of nitric oxide can proceed by two different mechanisms: the thermal (Zeldovich) mechanism or the prompt (Fenimore) mechanism. The thermal mechanism, which dominates in fuel-lean, premixed systems, is fairly well characterized. However, the prompt mechanism is poorly understood.

密歇根大学、帝国理工学院（伦敦）和桑迪亚国家实验室（利弗莫尔）参与的这一联合项目的目的是提高对扩散和富燃料火焰中一氧化氮（NO）形成的快速（Fenimore）途径的理解和预测能力。 关键的提示机制的化学物种进行测量和比较，从详细的动力学模型的结果。 NO，CH自由基，和氧原子的温度和浓度测量在一个稳定的扩散火焰使用非侵入式激光为基础的诊断。 所研究的火焰是在Tsuji型逆流燃烧器上稳定的甲烷/空气扩散火焰。 利用纳秒和皮秒激光诱导荧光（LIF）进行物种测量。 用相干反斯托克斯拉曼光谱（汽车）测量温度，并且通过解析皮秒LIF信号的时间衰减来直接测量猝灭。 使用瑞利散射（CH，O-原子）或通过测量已知量的掺杂剂（NO）进行校准。 通过调节火焰应变率（空气和燃料流量）来提供各种反应条件，并将一氧化氮加入燃料中，以测量NO与碳氢化合物反应（再燃烧）的破坏程度。减少污染物排放，特别是氮氧化物，是设计能量转换装置（包括汽车发动机、燃气轮机和家用加热炉）的关键问题。 根据火焰条件，一氧化氮的形成可以通过两种不同的机制进行：热（Zeldovich）机制或提示（Fenimore）机制。 热机制，占主导地位的贫燃料，预混系统，是相当好的特点。 然而，人们对这一提示机制知之甚少。