摇摆条件下螺旋管内两相流动不稳定性研究  

Study on Two-Phase Flow Instability in Helical Tube under Rolling Condition

作　　者：鲜麟 程坤 冉旭[2] 吴丹[2] 严俊杰[1] 乔守旭 Xian Lin;Cheng Kun;Ran Xu;Wu Dan;Yan Junjie;Qiao Shouxu(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an,710049,China;Nuclear Power Institute of China,Chengdu,610213,China;Harbin Engineering University,Harbin,150001,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]中国核动力研究设计院,成都610213 [3]哈尔滨工程大学,哈尔滨150001

出　　处：《核动力工程》2024年第5期85-91,共7页Nuclear Power Engineering

摘　　要：螺旋管蒸汽发生器具有结构紧凑、换热能力强的优势,在反应堆的设计中应用越来越广泛,但运行在海洋条件下,其流动传热特征与直管流道式换热设备有差异,特别是在摇摆条件下的两相流动不稳定性,针对其试验研究尚不充分。本文针对单根螺旋管的两相流动不稳定性开展了静态和摇摆条件下的试验研究,研究了在不同加热功率水平下,其由单相流动过渡至密度波型脉动,进而过渡至压力降型脉动的过程。静止条件下在加热功率较低时,螺旋管内单相流动各参数波动范围在1%以内,当加热功率达到11 kW时产生了周期为4.4 s的密度波型脉动,当加热功率达到13 kW时,出现了周期约34.3 s的压力降型脉动。在摇摆条件下,摇摆运动与脉动产生了显著的复合效应,波动周期和幅值均发生了变化,通过对试验数据的研究和处理,获取了螺旋管内两相流动不稳定性的周期和频率等特征,揭示了引起其与直管流道中的两相流动不稳定性现象差异的机理,以及摇摆条件对两相流动不稳定性的影响机制。Spiral-tube steam generator has the advantages of compact structure and strong heat exchange capacity,and it becomes increasingly prevalent in reactor design.However,its flow and heat transfer characteristics are different from those of straight-tube heat exchanges under marine conditions.Particularly,the instability of two-phase flow under rolling condition remains inadequately explored.In this study,the experimental study on the two-phase flow instability of a single helical tube is carried out under static and rolling conditions,and the process of its transition from single-phase flow to density wave pulsation and then to pressure drop pulsation under different heating power levels is studied.Under the static condition,when the heating power is low,the fluctuation range of each parameter of single-phase flow in the helical tube is within 1%.When the heating power reaches 11 kW,the density wave pulsation with a period of 4.4s is generated,and when the heating power reaches 13 kW,the pressure drop pulsation with a period of about 34.3s is generated.Under the rolling condition,the rolling motion and pulsation have a significant compound effect,and the fluctuation period and amplitude have changed.By studying and processing the experimental data,the characteristics of the period and frequency of the two-phase flow instability in the helical tube are obtained,and the mechanism that causes the difference between the two-phase flow instability in the helical tube and the straight tube flow channel is revealed,as well as the influence mechanism of the rolling condition on the two-phase flow instability.

关 键 词：螺旋管 摇摆条件 两相流动不稳定性 

分 类 号：TL331[核科学技术—核技术及应用]