项目名称: 柴油机相似条件下颗粒/燃料/空气预混火焰动力学及燃烧反应机理的研究
项目编号: No.51276126
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 能源与动力工程
项目作者: 宋金瓯
作者单位: 天津大学
项目金额: 85万元
中文摘要: 目前对火焰动力学的研究主要针对燃料/空气混合气,很少关注颗粒/燃料/空气混合气,而后者的研究对强化柴油机碳烟缸内氧化具有重要意义。申请项目拟在定容燃烧弹内采用纹影法测量含颗粒混合气拉伸火焰速率与拉伸率的关系以及当量比与马可斯坦长度的关系;发展含颗粒混合气无拉伸燃烧速率与温度、压力、当量比的关联式;采用平面激光诱导荧光法研究火焰不稳定性和蜂窝结构的形成过程。归纳不稳定波长与马可斯坦准数、Pelect准数的关系,以及蜂窝单元增长、裂变与拉伸率、热扩散率的关系,分析颗粒在火焰失稳和碎裂过程中的作用。采用McKenna燃烧器和气相色谱-质谱联用仪,精确探测火焰中间体、主要产物的种类和浓度,通过反应路径分析和敏感性分析,发展含颗粒混合气高温高压化学反应机理。建立颗粒扩散、氧化和热辐射与混合气火焰传播和稳定性相互影响的理论模型。结合柴油机实验,修改和完善模型,探索强化柴油机碳烟缸内氧化的技术途径。
中文关键词: 碳烟颗粒;火焰动力学;反应动力学;多次喷射;含氧燃料
英文摘要: Burning velocities of fuel/air mixtures have been investigated extensively, but there are only a limited number of literature data concerning particle/fuel/air mixtures which are important for the enhancement of in-cylinder soot oxidation in diesel engines. This project will measure the variation of flame stretched velocities with stretched rates and the variation of Markstein length with equivalence ratios in a constant volume cylindrical bomb using natural light and Schlieren high-speed cinè photography, and develop a correlation between unstretched burning velocities and combustion conditions (e.g. temperature, pressure, equivalence ratio). Flame instabilities and the formation of cellular structures during spherical gaseous explosions will been studied experimentally using single-shot planar laser-induced fluorescence (PLIF). Ranges of unstable wavelengths will be identified as a function of Markstein number and Peclet number. The dynamics of cell growth and fissioning will be qualitatively interpreted in terms of flame stretch rates and thermodiffusion. The effect of particle on flame stability will be characterized. Major products and intermediate species in flat flames on a McKenna burner will be identified by measurements of GS-MS. Sensitivity analysis and reaction path analysis will be performed to expl
英文关键词: Soot particles;Flame Dynamics;Chemical Kinetics;Split Injection;Oxygenates