Elucidation and Modeling on Unsteady Combustion Behavior of Heterogeneous Fuel System

研究了分离液滴对醇类和烃类的非定常燃烧行为，重点研究了燃料性质、环境成分和烟尘对分离液滴燃烧的影响。乙醇在空气中的燃烧表现出准稳定的燃烧行为，且液滴中水的凝结作用较弱。随着沸点温度的升高，正丁醇的燃烧速率呈逐渐升高的趋势。我们清楚地观察到，燃灰燃料的燃烧速度呈非定常的逐步增加。高浓度的环境二氧化碳抑制了烟尘的产生，从而减轻了不稳定行为。另一方面，高浓度的氩气增加了烟尘的产生，并促进了非定常行为。阐明了烟尘和环境因素对非定常燃烧行为的影响。

Unsteady combustion behaviors of the isolated droplet for alcohols and hydrocarbons were investigated and the effect of fuel properties, ambient components and soot were focused upon. Ethanol combustion in air showed a quasi-steady behavior and a weak effect of the water condensation into the droplet. N-buthanol with a higher boiling temperature shows a gradual increasing trend of the burning rate. An unsteady stepwise increase in the burning rate for sooting fuels were clearly observed. High concentrations of ambient carbon dioxide suppress the soot production and it results in a mitigation of the unsteady behavior. On the other hand, high concentrations of argon enhances the soot production and the unsteady behavior was also promoted. The effect of sooting and ambient factors on the unsteady burning behaviors were clarified.