摘要
建立了喷油嘴内部燃油两相流动CFD模型,基于界面追踪法(VOF)对比分析了应用LES湍流模型和标准k-ε湍流模型模拟空穴流动的结果。结果表明:大涡模拟方法得到的瞬态湍流运动呈现较明显的非对称分布,标准k-ε湍流模型模拟得到的湍流场比较均匀,而对称性比较明显。大涡模拟可以捕捉到更多的随机漩涡,对喷射的流场预报更为准确,更能反映流动的细节,有助于更加深刻地认识湍流的本质。
An internal nozzle two-phase CFD model was established based on the Volume of Fluids（ VOF） method to compare the cavitation simulation results of using LES turbulence model and the standard k-ε turbulence model. The result shows that the transient turbulent flow field is asymmetric computed by LES,while it is symmetrical computed by the standard k-ε turbulence model. On one hand,LES can describe the flow field more accuracy because it can capture more random vortexes. On the other hand,the LES can present the details of flow field,so it can help us to know the nature of turbulence deeply.
出处
《机床与液压》
北大核心
2016年第19期129-132,187,共5页
Machine Tool & Hydraulics
基金
高等学校博士学科点专项科研基金项目(20130143110009)
