纯水射流流场分布及冲击换热数值模拟研究  

Numerical Simulation of Water Jet Flow Field Distribution and Impingement Heat Transfer

作　　者：李超[1] 贺占蜀[1] 李大磊[1] LI Chao;HE Zhan-shu;LI Da-lei(School of Mechanical Engineering/He’nan Key Engineering Laboratory for Anti-Fatigue Manufacturing Technology,Zhengzhou University,He’nan Zhengzhou450001,China)

机构地区：[1]郑州大学机械与动力工程学院/抗疲劳制造技术河南省工程实验室,河南郑州450001

出　　处：《机械设计与制造》2020年第8期103-107,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金(U1804254)—高端装备关键零部件的极限寿命制造基础理论与方法。

摘　　要：纯水射流冲击换热过程是自由水射流对固体壁面的冲击,由于水流直接冲击被冷却的表面,喷射距离短且被冲击的表面上的对流边界层薄,从而使冲击区域产生很强的对流换热效果。首先对纯水射流流场分布进行分析,然后基于Fluent软件对不同参数下的射流冲击区域的对流换热过程建立射流冲击换热模型进行有限元仿真,系统地分析了射流水的射流速度、射流角度和喷嘴直径对纯水射流冲击换热过程的影响。结果表明:纯水射流流场一般分为自由射流区、滞止区和壁面射流区;随着射流速度的增大、射流角度的减小和喷嘴直径的增大,对流换热系数的数值增大,对流换热性能增强。The heat transfer process of water jet impingement is the impact of free water jet on solid wall. Since the water flow directly impacts the cooled surface,the standoff distance is short and the convective boundary layer on the impacted wall is thin,so that the impingement region produces a strong convective heat transfer effect. In this paper,the distribution of water jet flow field is firstly investigated. Then the jet impingement heat transfer model is established for the convective heat transfer process of jet impingement region under different parameters by using FLUENT. Finally,the influences of jet velocity,jet angle and nozzle diameter in the heat transfer process of water jet impingement are systematically investigated. The results show that the water jet flow field is generally divided into free jet zone,stagnation zone and near-surface jet zone. With the increase of jet velocity,the decrease of jet angle and the increase of nozzle diameter,the value of convective heat transfer coefficient increases,and the convective heat transfer performance increases.

关 键 词：纯水射流 流场分布 对流换热系数 有限元仿真 

分 类 号：TH16[机械工程—机械制造及自动化]