Investigation on combustion-initiation process of dispersed blended liquid fuels at high pressures

最终目的是建立混合燃料喷雾在高压下的汽化和着火特性的预测模型，该模型依赖于燃料成分和环境气体条件。在本研究中，孤立的液滴作为一个基本过程进行了研究。对正癸烷/乙醇混合燃料液滴在高温高压空气中的自燃进行了实验研究。通过改变燃料成分、空气温度和压力，获得了汽化率、着火延迟期、火焰温度和火焰直径等数据库。一般来说，随着乙醇成分的增加，自燃被抑制，乙醇挥发性更强，反应性更低。数值计算成功地再现了这一现象。

The final objective is to establish of the model to predict the vaporization and ignition characteristics of blended fuel spray at high pressure depending on fuel composition and ambient-gas conditions. In the present study, isolated droplets were studied as an elementary process. Spontaneous ignition of n-decane/ethanol blended fuel droplets in high-temperature and high-pressure air was experimentally observed. Fuel composition, air temperature and pressure were varied, and vaporization rate, ignition delay, flame temperature and flame diameter were obtained as database. Generally, spontaneous ignition was suppressed with increasing ethanol composition, which is more volatile and less reactive. Numerical calculation reproduced the phenomena successfully.