摘要
采用气液两相流大涡模拟对燃油雾化过程进行数值模拟。通过建立不同的计算边界研究了喷油器结构对喷孔内流及近喷孔区域燃油雾化特性的影响。在对比分析射流结构和喷孔内外流计算结果的基础上,讨论了射流初始扰动的产生机理及燃油雾化机理。根据计算结果发现:喷油器结构对喷孔内流有重要影响,实际喷油器的复杂结构会使燃油在离开喷孔前发展为湍流,湍流是导致初始扰动具有复杂频率和振幅组成的原因。边界突变是产生喷孔出口区域轴对称初始扰动的原因,该类型初始扰动具有单一的频率和振幅。
Using multiphase large eddy simulation （LES）, the atomization of a high-pressure diesel fuel jet was simulated. The effects of injector structures on the internal flow of nozzle hole and characteristics of atomization near nozzle region were studied. Based on the computational results, the mechanism of primary breakup and secondary breakup of fuel jet was discussed. The results show that the complex geometry of injector has a great influence on internal flow and can induce turbulence. Turbulence can cause the initial perturbation with complex frequency and amplitude. The axisymmetric perturbation with single frequency and amplitude is formed due to the sudden change at exit boundary.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2009年第3期39-44,共6页
Chinese Internal Combustion Engine Engineering
基金
国家自然科学基金资助项目(50776008)
新世纪优秀人才支持计划资助
关键词
内燃机
柴油喷射
大涡模拟
喷孔内流
IC engine
diesel fuel injection
large eddy simulation
internal flow of nozzle hole
