以液体燃料MILD燃烧为研究目标，以热伴流稀释液雾射流燃烧为研究平台，通过实验和数值计算等手段对其反应区特征及其主要影响因素和规律进行研究。采用PDA和PIV测量射流液滴的粒径分布和速度分布，研究热伴流中燃料射流的雾化特性参数随射流工况参数和伴流参数的变化规律，构建理论模型，将其作为后续研究的边界条件。采用拉曼－瑞利散射及NO-LIF测量火焰的抬举高度、主要组分的浓度及温度分布，采用PIV及OH-PLIF测量气相速度场和火焰组分耦合的空间分布，结合理论分析和数值计算，研究火焰结构及其主要影响因素。分析影响液体燃料射流火焰的抬举高度的主要因素，建立准则关系。分析射流雾化参数、伴流组分、温度和速度对空间温度分布、NOx等污染物生成的影响规律，通过对实验进行数值模拟，发展湍流液雾两相燃烧火焰面模型。以此带动液体燃料MILD的相关基础及应用研究，为液体燃料无焰燃烧技术的工业应用提供科技支撑。

This research project is aimed to study the reaction zone's characteristics and the main influencing factors and regulations of the MILD combustion of liquid fuels by means of experiment and numerical calculation, based on spray jet combustion in a diluted hot coflow. The PDA and PIV method will be used to measuring the size distribution and velocity distribution of jet droplet, and the regulations of fuel jet atomization parameters in coflow with different working parameters and coflow parameters will be also studied, and the result will be used as the boundry condition of numerical simulation in the further research. The flame lifting height, concentration of main component and temperature distribution will be measured by Raman-Rayleigh scattering and NO-LIF measurements, the gas velocity field and coupled space distribution of flame components will be measured by PIV and OH-LIF to study the flame structure and its mainly influencing factors with the combination of theoretical analysis and numerical calculation. The main factors affecting the flame lift-off height of liquid fuel will be analyzed and the relationship of criterions established. Besides, the jet atomization parameters, coflow components, the spatial distribution of temperature and speed, and pollutant formation will be discussed to build the two-phase turbulent liquid spray burning flamelet model by numerical simulation. Thus, all the results will promote the basic and applied research on MILD combustion of liquid fuels, and support the industrial applications of flameless combustion of liquid fuels.