基于不同收缩曲线的圆射流流场拟序结构分析  

The Analysis of Coherent Structure in Round Jet Based on Different Contraction Curve in Contraction Section

作　　者：罗静[1,2] 李丙乾[1,2] 李健[1,2] 

机构地区：[1]重庆理工大学机械工程学院,重庆400054 [2]重庆理工大学汽车零部件先进制造技术教育部重点实验室,重庆400054

出　　处：《组合机床与自动化加工技术》2016年第5期25-28,共4页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家自然科学基金(51275550)

摘　　要：为了分析不同的收缩曲线对喷嘴外部流场中流场结构的影响,利用大涡模拟方法,对具有正弦曲线、双三次曲线、维多辛斯基曲线的收缩段的外部流场进行了数值模拟,通过对比分析,正弦曲线喷嘴出口处的速度分布、湍流强度分布均优于其余两种曲线,并且其初始剪切层较薄,外部流场中涡环的卷起、配对现象明显,正弦收缩曲线的收缩段的外部流场的模拟结果与实验图像结果基本相符。In order to analysis the effect of different contraction curve on the external flow field of round jet, a numerical simulation, large eddy simulation, is conducted to study the contractive section of external flow field with sine curve, bicubic curve, Witozinsky curve contractive nozzle. Based on the comparison, the nozzle with sine curve is superior to the other two nozzles, with bicubic curve or Witozinsky curve respectively, in the distribution of the velocity and turbulence intensity in outlet. The initial shear layer is thin in the external flow field, and the vortex ring rolled and paired is obviously observed in this field. In addition, the result of the simulation of the external flow field with sine contraction curve nozzle is almost in accord- ance with the image get from the experiment.

关 键 词：大涡模拟 拟序结构 收缩曲线 数值分析 

分 类 号：TH166[机械工程—机械制造及自动化] TG506[金属学及工艺—金属切削加工及机床]