摘要
通过修改发动机多维CFD计算程序KIVA-3V,建立了内燃机缸内冷态流场的大涡模拟(LES)计算模型。利用此模型对4气门汽油机进气与压缩过程中缸内流场进行了详细分析,并与k-ε模型进行了比较。研究结果表明:与采用k-ε模型计算时相比,采用LES计算时显示了更为复杂的湍流结构;采用LES计算时除了能够得到有序的大尺度涡团结构外,还能捕捉到大量不规则的小涡团结构,而采用k-ε模型计算时基本上捕捉不到不规则的小涡团结构。
By amending the engine CFD package （KIVA-3V）, the large-eddy simulation （LES） model of in-cylinder cold state flow field for internal combustion engine was built up. The turbulent flow fields in the intake and compression strokes of a four-valve gasoline engine were simulated by using this model. In comparing the computational results with the obtained using κ-ε model, it is found that the results of the LES model exhibit more complex turbulent structure. Evidently, the LES model can capture a large number of irregular small-scale vortical structure and the coherent large-scale vortical structure, but the κ-ε model can not usually.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2010年第3期48-51,共4页
Chinese Internal Combustion Engine Engineering
基金
国家自然科学基金资助项目(50906059)
中国博士后科学基金项目(20080430733)
关键词
内燃机
湍流
大涡模拟
涡团结构
k-ε模型
IC engine
turbulent flow
large-eddy simulation（LES）
vortical structure
κ-ε model
