间隔同轴交叉扭带强化润滑油传热特性数值研究  

Numerical Study of Enhanced Heat Transfer Performance of Spaced Coaxial Cross Twisted Tapes for Oil Coolers

作　　者：吴启涛[1] 刘小丫 丁铭[2] 于洋[3] WU Qi-tao;LIU Xiao-ya;DING Ming;YU Yang(Nuclear Power Institute of China,Chengdu Sichuan 610213,China;College of Nuclear Science and Technology,Harbin Engineering University,Harbin Heilongjiang 150001,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu Sichuan 610213,China)

机构地区：[1]中国核动力研究设计院,四川成都610213 [2]哈尔滨工程大学,核科学与技术学院,黑龙江哈尔滨150001 [3]中国核动力研究设计院反应堆系统设计技术重点实验室,四川成都610213

出　　处：《科技视界》2019年第36期106-108,89,共4页Science & Technology Vision

摘　　要：滑油冷却器是核动力装置中一类不可或缺的换热器。运用强化传热技术可增强润滑油的传热、减小换热器的体积。为了增强传热管内润滑油的传热,本文提出了一种新型的规则间隔同轴交叉扭带。采用CFD方法,在间距率0.5~3.0的范围内,对圆管内插规则间隔同轴交叉扭带的管内传热系数与阻力系数进行了分析。结果表明,在雷诺数为40~1050的层流条件下,规则间隔同轴交叉扭带能够显著提高管内润滑油的对流传热系数,可达光管的2~5倍。而且,随着间距率的减小,虽然对流传热系数和阻力系数均随之增大,但是综合评价准则数仍随之增大。当间距率为0.5时,评价准则数最大可达2.98。Oil coolers are indispensable heat exchangers widely-used in power plants. The heat transfer enhancement technologies are effective methods to enhance heat transfer of oil and reduce the volume of oil coolers. In order to enhance heat transfer of oil in tube, the paper presents a new regularly spaced coaxial cross double twisted tape(RS-CCDTT).The convective heat transfer and resistance coefficients on oil side of the tube fitted with the RS-CCDTTs with space ratio of 0. 5 ~ 3. 0 are numerically investigated using CFD simulation method. Within the Reynolds number range of 40 ~1050, the results indicate that the laminar convective heat transfer coefficient on the oil side is improved greatly by the RS-CCDTT, which is 2 ~ 5 times of the smooth tube. Moreover, with the decreasing of space ratio, both the heat transfer and resistance coefficients increase, but performance evaluation criterion(PEC) increases. When space ratio is 0. 5, the maximum PEC is up to 2. 98.

关 键 词：同轴交叉扭带 规则间隔 强化传热 层流对流传热 滑油冷却器 

分 类 号：TQ028.8[化学工程]