摘要
利用丁酸甲酯的简化机理和计算的生物柴油物性参数,建立了生物柴油燃烧过程CHEMKIN和FIRE软件的耦合计算模型。该模型由于加入了燃料的化学反应动力学机理,同时考虑了化学时间尺度和湍流时间尺度对燃烧的影响,能更准确地反映预混燃烧程度和扩散燃烧的持续时间。通过在模拟中减小喷油器喷孔直径,得出湍流混合强度的增加能够避免燃料和自由基的局部浓度过高,使化学反应发生的区域更广,燃烧更充分,同时也有利于改变碳烟气态前驱物的氧化路径,从而降低碳烟排放。
Using a reduced chemical reaction kinetics mechanism of methyl butanoate and physical parameters of biodie-sel, coupled numerical simulation model of biodlesel＇ s combustion was established with CHEMKIN and FIRE. The mod-el can reflect the premixing combustion and diffusion combustion duration more accurately for the considering of both ki-netic time scale and turbulent time scale, after adding chemical kinetic mechanism of the fuel. By decreasing the injector nozzle diameter, the turbulent mixing enhanced, which avoid the fuel and radicals from high concentration and make combustion more completely. It can also help to change the path of oxidation of C2H2 and reduce soot emission.
出处
《农机化研究》
北大核心
2014年第1期225-229,共5页
Journal of Agricultural Mechanization Research
基金
国家自然科学基金项目(61262048)
江西省工业支撑项目(2009BGA01800)
关键词
生物柴油
耦合计算
湍流混合
反应速率
biodiesel
coupling calculation
turbulent mixing
reaction rate
