拟采用理论分析、数值模拟和实验研究等方法，开展气体燃料湍流火焰分层特性的基础研究。本研究选择甲烷单一气体燃料和甲烷掺氢等混合气燃料为研究对象，建立气体燃料湍流分层火焰的仿真分析模型，自主研制可实现浓度分层和反应活性分层的混合气配制的定容燃烧弹试验系统。基于建立的模型和研发的试验系统，重点研究浓度分层方式和反应活性分层方式下气体燃料湍流分层燃烧过程。通过改变燃料组成、背景湍流强度和当量比等研究气体燃料湍流分层燃烧特性，阐明不同分层方式下初始条件、燃料组分和当量比等对火焰形态演变过程和火焰传播速度的影响规律。研究不同分层方式下影响参数对火焰面结构的微观作用机理。本项目对丰富和深化气体燃料湍流分层燃烧理论研究，具有重要的学术价值。同时上述基础研究有助于深入理解直喷气体燃料发动机缸内燃烧特性，有助于推动高效率气体燃料发动机的关键技术突破，本申请具有重要工程实用价值

The fundamental research on turbulent combustion stratification characteristics of gaseous fuels will be conducted by using theoretical analysis, numerical simulation and experimental research methods. In this study, single gas fuel, namely methane , and mixed gas fuel, namely methane blended with hydrogen,are selected as the research objects. The simulation model of turbulent stratified flame of gas fuel was established, and a constant volume combustion bomb test system was developed independently, which could realize concentration stratification and reactivity stratification. Based on the established model and the developed experimental system, the turbulent stratified combustion process of gaseous fuels under concentration stratification and reactivity stratification are studied. By changing fuel composition, background turbulence intensity and equivalence ratio, the turbulent combustion stratification characteristics of gas fuels are studied. The effects of initial conditions, fuel composition and equivalence ratio on flame morphology evolution and flame propagation speed under different stratification modes are clarified. The micro-mechanism of influence parameters on flame surface structure under different stratification modes are studied. This project has important academic value for enriching and deepening the theoretical study of turbulent stratified combustion of gas fuel. At the same time, the above basic research is helpful to understand the combustion characteristics of direct-injection gas-fueled engine in-cylinder, and to promote the breakthrough of key technologies of high efficiency gas-fueled engine. This application has important practical engineering value.