采用Reynolds应力模型针对螺旋管内的单相流动周向非均匀传热现象开展数值模拟研究.基于与螺旋管传热实验数据的对比，验证该数值计算的正确性.研究发现：螺旋管周向传热分布随着重力加速度与离心力加速度之比(?)的变化而变化.导致这种现象的原因可能是螺旋管周向传热分布受离心力和重力的共同作用，?的变化引起了合力方向的变化，进而影响了螺旋管的周向传热分布；?是影响螺旋管单相流动周向传热分布的主要因素；分析总结管壁周向温度分布随加速度比、螺旋直径、螺旋升角、螺旋管水力学直径等参数的变化规律及其成因.
In this paper, the Reynolds stress model is used to simulate the circumferential non-uniform heat transfer of single-phase flow in a helical pipe. The calculation is verified based on the comparison with the experimental data. It is found that the ratio of gravity acceleration to centrifugal force acceleration (?) affects the circumferential heat transfer distribution of helical pipes. The reason for this is that the changes of ? lead to the changes of the direction of resultant force of gravity and centrifugal force. It is concluded that the main factor affecting the circumferential heat transfer distribution is ?. Besides, the changing rules and the effects of geometry parameters of helical pipes, such as the ratio of gravity acceleration to centrifugal force acceleration, pitch circle diameter, pipe hydraulic diameter, and spirally ascend angle, on the circumferential heat transfer distribution are discussed.
［1］BERSANO A, FALCONE N, BERTANI C, et al. Conceptual design of a bayonet tube steam generator with heat transfer enhancement using a helical coiled downcomer ［J］. Progress in Nuclear Energy, 2018, 108: 243-252.
［2］GOU J L, MA H F, YANG Z J, et al. An assessment of heat transfer models of water flow in helically coiled tubes based on selected experimental datasets［J］. Annals of Nuclear Energy, 2017, 110: 648-667.
［3］ZHANG Y, WANG D, LIN J, et al. Development of a computer code for thermalhydraulic design and analysis of helically coiled tube once-through steam generator ［J］. Nuclear Engineering and Technology, 2017, 49(7): 1388-1395.
［4］HARDIK B K, BABURAJAN P K, PRABHU S V. Local heat transfer coefficient in helical coils with single phase flow ［J］. International Journal of Heat & Mass Transfer, 2015, 89: 522-538.
［5］XIAO Y, HU Z X, CHEN S, et al. Experimental investigation and prediction of post-dryout heat transfer for steam-water flow in helical coils［J］. International Journal of Heat and Mass Transfer, 2018, 127: 515-525.
［6］XIAO Y, HU Z X, CHEN S, et al. Experimental study on dryout characteristics of steam-water flow in vertical helical coils with small coil diameters［J］. Nuclear Engineering and Design, 2018, 335: 303-313.
［7］XIAO Y, HU Z X, CHEN S, et al. Experimental investigation of boiling heat transfer in helically coiled tubes at high pressure［J］. Annals of Nuclear Energy, 2018, 113: 409-419.
［8］马越, 李晓伟, 吴莘馨.高温气冷堆螺旋管式直流蒸汽发生器传热管壁面热点数值分析［J］.工程热物理学报, 2013, 34(7): 1331-1334.
MA Yue, LI Xiaowei, WU Xinxin, Numerical analysis of the hot spot of the heat transfer tube wall in an HTGR helical tube once through steam generator［J］. Journal of Engineering Thermophysics, 2013, 34(7): 1331-1334.
［9］史建新, 孙宝芝, 刘尚华, 等.蒸汽发生器热工特性非轴对称分布数值模拟［J］.哈尔滨工程大学学报, 2015, 36(10): 1351-1355.
SHI Jianxin, SUN Baozhi, LIU Shanghua, et al. Numerical simulation on the non-axisymmetric distribution of thermal characteristics in a steam generator ［J］. Journal of Harbin Engineering University, 2015, 36(10): 1351-1355.
［10］JAYAKUMAR J S, MAHAJANI S M, MANDAL J C, et al. CFD analysis of single-phase flows inside helically coiled tubes［J］. Computers & Chemical Engineering, 2010, 34(4): 430-446.
［11］邵莉. R134a在卧式螺旋管内的两相流动与传热特性研究［D］. 济南: 山东大学, 2009.
SHAO Li. Study on two-phase flow and heat transfer characteristics of R134a in helical coils ［D］. Jinan: Shandong University, 2009.
［12］MORI Y S, NAKAYAMA W. Study of forced convective heat transfer in curved pipes (2nd report, turbulent region)［J］. International Journal of Heat and Mass Transfer, 1967, 10(1): 37-59.
［13］MORI Y, NAKAYAMA W. Study on forced convective heat transfer in curved pipes (3rd report, theoretical analysis under the condition of uniform wall temperature and practical formula)［J］. International Journal of Heat & Mass Transfer, 1967, 10(5): 681-695.
