无焰燃烧具有温度均匀、稳定性好且NOx排放低等优点。常规无焰燃烧强度偏低(<0.5MW/(m3atm))，工业应用范围有限，提高燃烧强度是拓宽其应用领域的重要前提。受限于实验手段，高强度无焰燃烧过程仍未实现高精度测量，而近年发展起来的激光吸收光谱层析燃烧诊断技术有望解决这一难题。申请人拟引入该技术对气体燃料高强度无焰燃烧过程的燃烧特性进行定量测量，进而构建可靠的数值模型，深入研究高强度无焰燃烧的反应特性与建立机制。具体目标为：(1)掌握吸收光谱层析应用于无焰燃烧测量的关键技术；(2)实现实验室规模高强度无焰燃烧(1-10MW/(m3atm))，利用吸收光谱层析技术获取二维温度和H2O浓度数据；(3)构建适用于高强度无焰燃烧过程的数值模型，研究重要反应特性并总结燃烧模式判据，探索高强度无焰燃烧的建立机制。本项目的完成将为高强度无焰燃烧技术的工业应用及优化提供有力的理论和方法支撑。

Flameless combustion is a unique combustion phenomenon with uniform temperature distribution, high combustion stability and low NOx emission. The industrial application of flameless combustion has been limited by its relatively low combustion intensity (<0.5 MW/(m3atm)). Therefore, it is necessary to develop high intensity flameless combustion (HI-FLC) to handle the challenge. However, due to the lack of measuring method, quantitative, high precision, in-situ measurement for HI-FLC has not been reported yet. Recent advances in tomographic absorption spectroscopy (TAS) has made the HI-FLC measurement possible. In this project, TAS is applied to measure the combustion characteristics of gaseous HI-FLC and to validate the numerical models for HI-FLC simulations, so that the establishment of HI-FLC can be further explored and understood. Particularly, this project is proposed to: (1) investigate the key factors for the TAS application in flameless combustion; (2) establish laboratory-scale HI-FLC (1-10 MW/(m3atm)) and measure the 2D distributions of temperature and H2O concentration using TAS; (3) build suitable numerical models to study important combustion characteristics, to obtain combustion mode criterion and to investigate the occurrence of HI-FLC. The completion of this project will lay a strong foundation for HI-FLC and its industrial application.