涡产生器倾角对换热器内流动与换热特性的影响  

Effects of Inclination Angle of Vortex Generator on Fluid Flow and Heat Transfer Characteristics of Heat Exchanger

作　　者：高辰 罗超 史维娜 宋克伟 GAO Chen;LUO Chao;SHI Wei-na;SONG Ke-wei(Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education,School of Mechanical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学机电工程学院铁道车辆热工教育部重点实验室,甘肃兰州730070

出　　处：《推进技术》2020年第4期868-874,共7页Journal of Propulsion Technology

基　　金：国家自然科学基金(51866007);甘肃省自然科学基金(17JR5RA092);甘肃省协同创新团队(2018C-13)。

摘　　要：为优化涡产生器强化传热的性能,通过改变三角翼式涡产生器的倾角,数值分析了倾角变化对板式换热器通道内流动与换热特性的影响,倾角变化范围为-30°~30°。获得了不同倾角下通道内的纵向涡、涡量分布,换热及阻力特性。结果表明涡产生器倾斜方向对流动与换热的影响不同,存在最佳的涡产生器倾角-10°,使得换热通道内涡产生器强化换热的性能最优;改变倾角可进一步提高涡产生器的强化传热性能,不同倾角对应努塞尔数和热性能评价因子间的最大差值分别达到8.9%和5.7%。To improve the heat transfer enhancement performance of vortex generator,the inclination angle of a delta winglet vortex generator is proposed.The effects of inclination angle in the range between-30°and 30°on the fluid flow and heat transfer characteristics are numerically studied in the flow channel of plate heat exchanger.The details of the longitudinal vortex,vorticity,heat transfer and pressure loss in the flow channel are obtained under different inclination directions and different inclination angles.The results showed that inclination direction has apparent effect on the characteristics of fluid flow and heat transfer.There is an optimum inclination angle with-10°for the best heat transfer performance.Heat transfer performance of vortex generator can be further improved by changing the inclination angle.The maximum differences in Nusselt number and thermal performance factor between different inclination angles are approximately 8.9%and 5.7%,respectively.

关 键 词：换热器 涡产生器 倾角 对流传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]