中文摘要：

运用数值方法对均质压燃条件下二异丁烯（Diisobutylene,DIB）的着火与燃烧特性进行了研究。数值计算结果与相应实验结果吻合较好,说明数值计算合理可靠。分析了初始压力、当量比、燃料组分对二异丁烯着火特性的影响,以及二异丁烯在HCCI发动机条件下的燃烧特征。结果表明,随着初始压力、当量比的增加,二异丁烯着火延迟期缩短;燃烧达到的最高温度随着当量比增加而提高,但不受初始压力变化的影响。在均质压燃条件下,二异丁烯同分异构体DIB-1着火先于DIB-2,二异丁烯混合物燃料着火延迟时间依赖于二异丁烯同分异构体组分的比例关系。二异丁烯是单阶段着火燃料,DIB-2最大放热率低于DIB-1,但仍能提供良好的动力性能。

英文摘要：

The homogeneous charge compression ignition（HCCI） characteristics of diisobutylene are studied numerically.Numerical results are in accord with the corresponding experimental data.The influence of some key parameters such as initial pressure,equivalence ratio and constituent on autoignition characteristics is discussed and combustion characteristics of diisobutylene in HCCI engine are analyzed.The results indicate that the ignition delay decreases with the increase of pressure and equivalence ratio.The maximum temperature increases with the rise of equivalence ratio,but it does not change with the variation of initial pressure.The 1-pentene isomer ignites significantly faster than the 2-pentene isomer and the ignition delay for the blend directly depends on the proportions of each isomer.It can be found that diisobutylene shows the single-stage autoignition.The maximum heat production rate of the 2-pentene is lower than that of 1-pentene,but the 2-pentene still provides good power performance.