R1234yf套管式蒸发器模拟研究  

Simulation of Double-tube Evaporator with R1234yf

作　　者：刘馨[1] 张卫军[1] 曹琬 周乐 石泉 Liu Xin;Zhang Weijun;Cao Wan;Zhou Le;Shi Quan(College of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金与能源学院

出　　处：《流体机械》2019年第9期67-71,50,共6页Fluid Machinery

基　　金：“十三五”国家重点研发计划项目（2017YFA0700300）;国家自然科学基金项目（U1760115）

摘　　要：新型制冷剂R1234yf近几年作为R134a的替代选择被广泛研究,FLUENT工程软件可以模拟制冷剂在蒸发器中的相变换热过程,得到换热过程中制冷剂的温度分布以及流速对换热的影响,通过对模拟数据的分析,获得气相制冷剂沿换热管轴向的体积率分布。通过改变FLUENT软件中边界条件相关参数,得到平均换热系数随蒸发压力、和热流密度和流速的变化趋势以及改变蒸发温度对含汽率的影响。结果表明在干度为0.68时传热系数为最大值,随着干度的增加,先升高后降低。The new refrigerant R1234yf as an substitute of R134a has been widely studied in recent years,the numerical simulation of phase-change heat transfer in evaporator was carried out for R1234yf by FLUENT.The influence of temperature distribution and velocity of the refrigerant on heat transfer was obtained.By analyzing the simulated data,the volume rate distribution of the gas phase refrigerant along the axial direction of the heat exchange tube was obtained.By changing related parameters such as boundary condition in FLUENT,the change trend of average heat transfer coefficient with evaporating pressure,heat flux and flow velocity and influence of evaporation temperature on the rate of vapor content were obtained.The simulated results show that heat transfer coefficient reaches its maximum value at the vapor quality of 0.68,and transfer coefficient first increases and then decreases with the increase of vapor quality.

关 键 词：R1234yf 多相流模拟 套管式蒸发器 

分 类 号：TH137[机械工程—机械制造及自动化]