中文摘要：

将大涡模拟（LES）湍流模型和几种不同的雾化模型纳入KIVA-3V程序中，研究了柴油的喷射和雾化过程。以燃油液相、蒸气相和混合气当量比的试验数据为依据，分别在不同工况下对比了TAB（Taylor Analogy Breakup）、MTAB（Modified TAB Model）、CAB（Cascade Atomization and Drop Breakup）和KH-RT（Kelvin-Helmholtz Rayleigh-Taylor）4种雾化模型在LES模拟中的性能。结果表明KH—RT模型对燃油液相和蒸气相的贯穿距、蒸气区域分布形态的预测方面均与试验接近，好于其它3种雾化模型。TAB模型由于分裂后液滴粒径较小，计算得到的液相贯穿距过小，蒸气相浓度过大。MTAB模型和CAB模型预测得到的液相贯穿距与KH—RT模型相近，但混合气的当量比明显小于试验值。在均采用KH—RT雾化模型下，通过对比RANS和LES的模拟结果发现，RANS模型得到的蒸气贯穿距要明显小于试验值，同时无法预测蒸气区域边界的间歇性、不规律的涡团结构，而LES模型可以很好地捕捉这些特性。

英文摘要：

Large eddy simulation （LES） turbulence model and several droplet breakup models have been implemented into the KIVA-3V code to investigate the atomization and evaporation processes of diesel spray. Based on the experimental results under different conditions, four breakup models, including Taylor Analogy Breakup （TAB） , Modified TAB （MTAB） , Cascade Atomization and Drop Breakup （CAB） and Kelvin-Helmhohz Rayleigh-Taylor （KH-RT）, were compared in terms of liquid and vapor distributions. Results show that KH-RT model gives better performance in prediction of liquid and vapor penetration and shape of vapor distribution than other three models. Liquid penetration is under-estimated and evaporation rate is significantly over-estlmated by TAB model due to the smaller droplet diameter after breakup. Compared to KH-RT model, similar liquid penetration are obtained by MTAB and CAB models, but the equivalence ratio is under-predicted by MTAB and CAB models. When KH-RT model is used, the comparison between Reynolds-averaged Navier-Stokes （RANS） model and LES model shows that RANS model obviously under-estimates vapor penetration length and hardly predict the intermittency and irregular vortical structure in the spray periphery. However, these features can be well captured by LES model.