预混活性可控氛围下高十六烷值燃料着火燃烧机理及燃烧稳定性研究

High-efficiency clean combustion can be realized in the dual-fuel reactivity controlled combustion engine. However, we do not fully and deeply understand the combustion characteristics of high-cetane number fuel ignition under the high-octane fuel reactivity controlled atmosphere, and some basic issues still need to be solved. For this purpose, the application is mainly focused on ignition combustion of high-cetane number fuel, controlled mixture formation and combustion stability at high load. The chemical mechanism that using the high octane fuel delays the ignition of high-cetane fuel is studied by analyzing the high-cetane fuel ignition combustion process and chemical kinetics calculation under the different conditions; the atomization and diffusion process of high-octane fuel and its effect on thermal and fuel reactivity stratification are studied and the formation of premixed fuel reactivity mixture is discussed. Knocking phenomenal of dual-fuel reactivity controlled combustion at high load is studied, and the effects of different boundary parameters on knock are assessed. The research tries to disclose mixture stratification, combustion flame characteristics and evolution process of intermediates, explore ignition and knock of high-cetane fuel under the different fuel reactivity controlled atmosphere, develop kinetic mechanism of the blend of high-octane fuel and high-cetane fuel. The research results will lay solid theoretical foundation for the scientific method of high efficiency and clean combustion of the engine.

双燃料反应活性可控压燃发动机可实现高效低污染燃烧，但是我们对活性可控氛围下高十六烷值燃料着火燃烧特性的认识还不够全面和深入，还有一些基础科学问题亟需提炼和研究，为此，本申请围绕预混可控氛围下高十六烷值燃料的着火燃烧特性、可控混合气的形成和高负荷燃烧稳定性展开研究，通过试验和计算研究不同预混氛围下高十六烷值燃料的着火过程，探讨不同辛烷值燃料抑制高十六烷值燃料着火的化学机制；研究气道内高辛烷值燃料雾化扩散过程及其对缸内热分层和化学活性分层的影响，探讨可控活性混合气的形成过程；研究高负荷下双燃料反应活性可控压燃发动机的爆燃现象，探讨不同边界参数对爆燃的影响规律。本申请力图揭示分层、燃烧火焰特征、燃烧中间产物生成演化历程等信息，探索活性可控氛围下高十六烷值燃料着火燃烧机理及爆燃特性，发展高辛烷值/高十六烷值混合燃料动力学机理，研究结果将为探索发动机高效清洁燃烧的科学方法奠定坚实的理论基础。

采用双燃料反应活性可控技术可实现发动机高效清洁燃烧，但是我们对活性可控氛围下高十六烷值燃料着火燃烧特性的认识还不够系统和深入，需要对其中的一些基础科学问题进行深入的讨论和研究。基于此，本项目围绕预混活性可控氛围下高十六烷值燃料的着火燃烧特性、可控混合气的形成和高负荷爆燃特性展开研究，通过计算和试验研究了不同预混氛围下高十六烷值燃料的着火过程，分析了不同辛烷值燃料抑制正庚烷着火的化学机制；研究了气道内高辛烷值燃料的雾化扩散过程，探讨了可控活性混合气的形成过程；研究了高负荷下双燃料反应活性可控压燃发动机的爆燃现象，探讨不同边界参数对爆燃的影响规律。本项目的研究结果揭示了可控活性混合气的形成过程，探索了活性可控氛围下高十六烷值燃料着火燃烧机理及爆燃特性，发展了高辛烷值/正庚烷混合燃料动力学机理，研究结果将为探索发动机高效清洁燃烧的科学方法奠定坚实的理论基础。