环形窄缝通道单相摩擦阻力特性研究  

Study on flow friction characteristics of single-phase flow in annular narrow channel

作　　者：彭军 PENG Jun(Naval Armament Department,Beijing 100841,China)

机构地区：[1]海军装备部动力装备局

出　　处：《核技术》2019年第10期82-88,共7页Nuclear Techniques

摘　　要：采用商业软件FLUENT6.3对不同宽度(h=0.775~1.742 mm,0.69<ri/ro<0.86)环形通道内单相水的层流(300<Re<1 800)和旺盛湍流(104<Re<105)的摩擦阻力系数进行计算流体动力学(Computational Fluid Dynamics,CFD)模拟,同时研究了不同偏心度(e=0.01~0.5)对摩擦阻力系数的影响,以考虑制造和装配过程中产生的偏心对环形通道中摩擦阻力的影响。结果分析表明:层流时,CFD计算结果与环缝理论解完全一致;湍流时,10^4<Re<5×10^4范围内,CFD计算结果与Blausius公式最为一致,5×10^4<Re<10^5范围内,CFD计算结果与McAdams公式最为一致;结合以上结论,提出以环缝等效水力直径为特征长度的单相摩擦阻力系数关系式f=0.257 5Re^?0.23,该式在10^4<Re<10^5范围内,预测精度都较好。另外对偏心度影响的结果分析表明:摩擦阻力系数主要受偏心度大小的影响,偏心度越大,阻力系数下降越多;在相同偏心度下,环缝的宽度对阻力系数有一定影响,但影响程度较小;在相同偏心度下,相对于同心窄缝通道,雷诺数对阻力系数的降低程度没有影响。[Background]Eccentricity in the manufacture and assembly of nuclear fuel assemblies will affect the annular channel.[Purpose]This study aims to investigate the characteristics of the single-phase flow in narrow annular channels.[Methods]Computational fluid dynamics(CFD)simulation on single-phase flow friction characteristic in straight annuli channel with different width(h=0.775~1.742 mm,0.69<ri/ro<0.86)in ranges of laminar flow(300<Re<1 800)and fully developed turbulent flow(10^4<Re<10^5)were carried out by commercial code FLUENT.The influence of different eccentricity(e=0.01~0.5)was also considered.[Results]The results show that for laminar flow the simulated friction factors are completely agreed with that of the analytic solution.When the Reynolds number is in the range of 10^4~5×10^4,the Blausius correlation achieves more exact results with CFD;and while the Reynolds number is in the range of 5×10^4~10^5,the McAdams correlation gets more consistent results with CFD.[Conclusions]Based on the above conclusions,proposed correlation f=0.257 5Re^?0.23 can well predict in the whole Reynolds number in the range of 104~105.Furthermore,the friction factor is a function of eccentricity,a relatively weak function of width,and independent of the Reynolds number.

关 键 词：环形通道 摩擦阻力 单相 偏心度 

分 类 号：TL99[核科学技术—核技术及应用]