不同激励频率的脉冲微射流对圆射流流场扩散掺混的数值模拟和影响分析（英文）  

Analysis of influence and numerical simulation of pulsed micro jet with different excitation frequency on the diffusion mixing of round turbulent jet flow field

作　　者：罗静[1] 曾国辉[1,2] 李丙乾[1,2] 李健[3] Jing LUO Guo-hui ZENG Bing-qian LI Jian LI(College of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China Key Laboratory of Advanced Manufacturing Technology for Automobile Parts, Ministry of Education, Chongqing 400054, China Chongqing Electro Mechanical Institute of Vocation and Technology, Chongqing 400054, China)

机构地区：[1]重庆理工大学机械工程学院,重庆400054 [2]汽车零部件先进制造技术教育部重点实验室,重庆400054 [3]重庆机电职业技术学院,重庆400054

出　　处：《机床与液压》2016年第24期32-38,46,共8页Machine Tool & Hydraulics

基　　金：partly Sponsored by National Natural Science Foundation of China (No.51275550)

摘　　要：采用Fluent商用计算软件，结合实验所得数据，在保持微射流与主射流的占空比A为10％和质量流率比Cm为0．05％不变的条件下，将侧向垂直分布的脉冲微射流的激励频率与主射流的大涡频率比值Fv／Fo在0—2范围内变化，对圆射流外部流场的扩散掺混进行了研究。结果表明：流场的流动状态对脉冲激励频率的变化十分敏感，在微射流激励频率Fv与主射流大涡频率Fo相同时，流场的掺混增强效果最明显，流向涡结构较为规则，且在向外扩散发展的过程中能够卷吸更多的流体进行掺混。Compared with the experimental data, the Fluent commercial software was used to study the mixing of the external round jet flow field in this paper. Under the same conditions with duty ratio A 10% and mass flow rate ratio Cm 0. 05% for the primary jet and micro-jet, the micro excitation frequency of the jet and main jet vortex frequency ratio Fr/Fo was varied from 0 to 2, and the mixing of the flow field mixing effect of the lateral and ver- tical distribution of pulse were obtained. The results show that the flow field of the flow state is sensitive to the change of pulse excitation frequency; The entrainment mixing enhancement is obvious, and the structure of flow vortex is not only more rule, but also in the process of spreading outward development to entrain more fluid mixing when the micro jet excitation frequency Fv is equal to the large eddy frequency Fo.

关 键 词：圆射流 脉冲微射流 流向涡 掺混 

分 类 号：TH138[机械工程—机械制造及自动化]