新型开缝翅片管壳侧传热与阻力特性  

Heat transfer and resistance characteristics of shell side of novel finned tube with slot

作　　者：丁天翔 彭浩[1] 马杰 DING Tianxiang;PENG Hao;MA Jie(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]南京工业大学机械与动力工程学院,南京210009

出　　处：《航空动力学报》2024年第12期277-286,共10页Journal of Aerospace Power

基　　金：国家自然科学基金(51776095)。

摘　　要：设计了一种新型开缝翅片,通过实验与数值模拟研究新型开缝翅片的流动传热特性,分析翅片间距与相对开缝高度对新型开缝翅片的传热与阻力特性影响规律,并采用幂函数多元非线性拟合获得相关的流动传热关联式。研究表明:新型翅片管相较于平直翅片管壳侧综合传热性能提升了1.46~1.64倍。在雷诺数Re=9500、相对开缝高度为0.5时,翅片间距从1.6 mm减小到1.0 mm,空气侧努塞尔数Nu增加了19.44%,空气侧阻力系数f增加了39.54%,综合传热性能增强了6.88%;在雷诺数Re=9500、翅片间距为1.2 mm时,相对开缝高度从0.4增大到0.7,空气侧Nu增加了11.55%,空气侧f增加了4.74%,综合传热性能增强了9.84%。最后提出了平均偏差在10%以内的努塞尔数Nu和阻力系数f的计算关联式。A novel type of slotted fin was designed.The flow and heat transfer characteristics of the novel slotted fin were studied by experiment and numerical simulation.The influences of fin pitch and relative slotted height on the heat transfer and resistance characteristics of the novel slotted fin were analyzed.The relevant flow and heat transfer correlation was obtained by power function multivariate nonlinear fitting.Research showed that the shell side comprehensive heat transfer performance of the novel finned tube was 1.46—1.64 times higher than that of the plain finned tube.When Reynolds number Re=9500 and relative slotting height was 0.5,the fin pitch decreased from 1.6 mm to 1.0 mm,the air side Nusselt number Nu increased by 19.44%,the air side drag coefficient f increased by 39.54%,and comprehensive heat transfer performance increased by 6.88%.When the Reynolds number Re=9500 and fin pitch was 1.2 mm,relative slotting height increased from 0.4 to 0.7,the air side Nu increased by 11.55%,the air side f increased by 4.74%,and comprehensive heat transfer performance increased by 9.84%.The calculation correlations of Nusselt number and resistance coefficient with average deviation less than 10%were finally proposed.

关 键 词：翅片管 开缝翅片 综合传热性能 阻力系数 无量纲关联式 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]